Fmt is currently the only required C++ dependency that isn't bundled.
Since the Fmt API is still evolving, it's convenient for Ccache users
that lack a proper Fmt version locally to be able to build without
having to download Fmt. Thus, bundle Fmt again for now. (When we can
bump compiler requirements to versions that implement std::format
properly in the future we will switch to std::format instead.)
Closes #1470.
packages+=(libxxhash-dev)
else
cmake_params+=(-D DEP_DOCTEST=DOWNLOAD)
- cmake_params+=(-D DEP_FMT=DOWNLOAD)
cmake_params+=(-D DEP_XXHASH=DOWNLOAD)
fi
sudo apt-get install -y "${packages[@]}"
----
+=== src/third_party/fmt/fmt/*.h and src/third_party/fmt/format.cpp
+
+This is a subset of https://fmt.dev[fmt] 10.2.1 with the following license:
+
+----
+Formatting library for C++
+
+Copyright (c) 2012 - present, Victor Zverovich
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+--- Optional exception to the license ---
+
+As an exception, if, as a result of your compiling your source code, portions
+of this Software are embedded into a machine-executable object form of such
+source code, you may redistribute such embedded portions in such object form
+without including the above copyright and permission notices.
+----
+
+
=== src/third_party/nonstd-span/nonstd/span.hpp
This is the single header version of
mark_as_advanced(FMT_INCLUDE_DIR FMT_LIBRARY)
-if(DEPS STREQUAL "DOWNLOAD" OR DEP_FMT STREQUAL "DOWNLOAD")
- message(STATUS "Downloading Fmt as requested")
- set(_download_fmt TRUE)
+if(DEP_FMT STREQUAL "BUNDLED")
+ message(STATUS "Using bundled Fmt as requested")
else()
find_path(FMT_INCLUDE_DIR fmt/core.h)
find_library(FMT_LIBRARY fmt)
set(_fmt_version_string "${_fmt_major}.${_fmt_minor}.${_fmt_patch}")
if(NOT "${CMAKE_MATCH_0}" STREQUAL "" AND "${_fmt_version_string}" VERSION_GREATER_EQUAL "${Fmt_FIND_VERSION}")
message(STATUS "Using system Fmt (${FMT_LIBRARY})")
- set(_fmt_origin "SYSTEM (${FMT_LIBRARY})")
add_library(dep_fmt UNKNOWN IMPORTED)
set_target_properties(
dep_fmt
INTERFACE_INCLUDE_DIRECTORIES "${FMT_INCLUDE_DIR}"
IMPORTED_LOCATION "${FMT_LIBRARY}"
)
+ register_dependency(Fmt "SYSTEM (${FMT_LIBRARY})" "${_fmt_version_string}")
endif()
endif()
- if(NOT _fmt_origin)
- if(DEPS STREQUAL "AUTO")
- message(STATUS "Downloading Fmt from the internet since Fmt>=${Fmt_FIND_VERSION} was not found locally and DEPS=AUTO")
- set(_download_fmt TRUE)
- else()
- message(FATAL_ERROR "Could not find Fmt>=${Fmt_FIND_VERSION}")
- endif()
+ if(NOT TARGET dep_fmt)
+ message(STATUS "Using bundled Fmt since Fmt>=${Fmt_FIND_VERSION} was not found locally")
endif()
endif()
-
-if(_download_fmt)
- set(_fmt_origin DOWNLOADED)
- set(_fmt_version_string 10.2.1)
-
- include(FetchContent)
- FetchContent_Declare(
- Fmt
- URL "https://github.com/fmtlib/fmt/releases/download/${_fmt_version_string}/fmt-${_fmt_version_string}.zip"
- URL_HASH SHA256=312151a2d13c8327f5c9c586ac6cf7cddc1658e8f53edae0ec56509c8fa516c9
- )
- FetchContent_MakeAvailable(Fmt)
- add_library(dep_fmt ALIAS fmt)
-endif()
-
-if("${_fmt_version_string}" VERSION_LESS 10.1.0)
- # https://github.com/fmtlib/fmt/issues/3415
- add_compile_flag_if_supported(CCACHE_COMPILER_WARNINGS "-Wno-dangling-reference")
-endif()
-
-register_dependency(Fmt "${_fmt_origin}" "${_fmt_version_string}")
- [cpp-httplib](https://github.com/yhirose/cpp-httplib)[^1]
- [doctest](https://github.com/doctest/doctest)[^2] (optional, disable with `-D
ENABLE_TESTING=OFF`)
-- [fmt](https://fmt.dev)[^2]
+- [fmt](https://fmt.dev)[^1]
- [hiredis](https://github.com/redis/hiredis)[^2] (optional, disable with `-D
REDIS_STORAGE_BACKEND=OFF`)
- [span-lite](https://github.com/martinmoene/span-lite)[^1]
if(NOT TARGET dep_cpphttplib)
add_subdirectory(cpp-httplib)
endif()
+if(NOT TARGET dep_fmt)
+ add_subdirectory(fmt)
+endif()
if(NOT TARGET dep_nonstdspan)
add_subdirectory(nonstd-span)
endif()
--- /dev/null
+register_dependency(Fmt BUNDLED 10.2.1)
+
+add_library(dep_fmt STATIC fmt/format.cc)
+target_include_directories(dep_fmt SYSTEM PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}")
+target_link_libraries(dep_fmt PRIVATE standard_settings)
--- /dev/null
+// Formatting library for C++ - the core API for char/UTF-8
+//
+// Copyright (c) 2012 - present, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#ifndef FMT_CORE_H_
+#define FMT_CORE_H_
+
+#include <cstddef> // std::byte
+#include <cstdio> // std::FILE
+#include <cstring> // std::strlen
+#include <iterator>
+#include <limits>
+#include <memory> // std::addressof
+#include <string>
+#include <type_traits>
+
+// The fmt library version in the form major * 10000 + minor * 100 + patch.
+#define FMT_VERSION 100201
+
+#if defined(__clang__) && !defined(__ibmxl__)
+# define FMT_CLANG_VERSION (__clang_major__ * 100 + __clang_minor__)
+#else
+# define FMT_CLANG_VERSION 0
+#endif
+
+#if defined(__GNUC__) && !defined(__clang__) && !defined(__INTEL_COMPILER) && \
+ !defined(__NVCOMPILER)
+# define FMT_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
+#else
+# define FMT_GCC_VERSION 0
+#endif
+
+#ifndef FMT_GCC_PRAGMA
+// Workaround _Pragma bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59884.
+# if FMT_GCC_VERSION >= 504
+# define FMT_GCC_PRAGMA(arg) _Pragma(arg)
+# else
+# define FMT_GCC_PRAGMA(arg)
+# endif
+#endif
+
+#ifdef __ICL
+# define FMT_ICC_VERSION __ICL
+#elif defined(__INTEL_COMPILER)
+# define FMT_ICC_VERSION __INTEL_COMPILER
+#else
+# define FMT_ICC_VERSION 0
+#endif
+
+#ifdef _MSC_VER
+# define FMT_MSC_VERSION _MSC_VER
+# define FMT_MSC_WARNING(...) __pragma(warning(__VA_ARGS__))
+#else
+# define FMT_MSC_VERSION 0
+# define FMT_MSC_WARNING(...)
+#endif
+
+#ifdef _MSVC_LANG
+# define FMT_CPLUSPLUS _MSVC_LANG
+#else
+# define FMT_CPLUSPLUS __cplusplus
+#endif
+
+#ifdef __has_feature
+# define FMT_HAS_FEATURE(x) __has_feature(x)
+#else
+# define FMT_HAS_FEATURE(x) 0
+#endif
+
+#if defined(__has_include) || FMT_ICC_VERSION >= 1600 || FMT_MSC_VERSION > 1900
+# define FMT_HAS_INCLUDE(x) __has_include(x)
+#else
+# define FMT_HAS_INCLUDE(x) 0
+#endif
+
+#ifdef __has_cpp_attribute
+# define FMT_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x)
+#else
+# define FMT_HAS_CPP_ATTRIBUTE(x) 0
+#endif
+
+#define FMT_HAS_CPP14_ATTRIBUTE(attribute) \
+ (FMT_CPLUSPLUS >= 201402L && FMT_HAS_CPP_ATTRIBUTE(attribute))
+
+#define FMT_HAS_CPP17_ATTRIBUTE(attribute) \
+ (FMT_CPLUSPLUS >= 201703L && FMT_HAS_CPP_ATTRIBUTE(attribute))
+
+// Check if relaxed C++14 constexpr is supported.
+// GCC doesn't allow throw in constexpr until version 6 (bug 67371).
+#ifndef FMT_USE_CONSTEXPR
+# if (FMT_HAS_FEATURE(cxx_relaxed_constexpr) || FMT_MSC_VERSION >= 1912 || \
+ (FMT_GCC_VERSION >= 600 && FMT_CPLUSPLUS >= 201402L)) && \
+ !FMT_ICC_VERSION && (!defined(__NVCC__) || FMT_CPLUSPLUS >= 202002L)
+# define FMT_USE_CONSTEXPR 1
+# else
+# define FMT_USE_CONSTEXPR 0
+# endif
+#endif
+#if FMT_USE_CONSTEXPR
+# define FMT_CONSTEXPR constexpr
+#else
+# define FMT_CONSTEXPR
+#endif
+
+#if (FMT_CPLUSPLUS >= 202002L || \
+ (FMT_CPLUSPLUS >= 201709L && FMT_GCC_VERSION >= 1002)) && \
+ ((!defined(_GLIBCXX_RELEASE) || _GLIBCXX_RELEASE >= 10) && \
+ (!defined(_LIBCPP_VERSION) || _LIBCPP_VERSION >= 10000) && \
+ (!FMT_MSC_VERSION || FMT_MSC_VERSION >= 1928)) && \
+ defined(__cpp_lib_is_constant_evaluated)
+# define FMT_CONSTEXPR20 constexpr
+#else
+# define FMT_CONSTEXPR20
+#endif
+
+// Check if constexpr std::char_traits<>::{compare,length} are supported.
+#if defined(__GLIBCXX__)
+# if FMT_CPLUSPLUS >= 201703L && defined(_GLIBCXX_RELEASE) && \
+ _GLIBCXX_RELEASE >= 7 // GCC 7+ libstdc++ has _GLIBCXX_RELEASE.
+# define FMT_CONSTEXPR_CHAR_TRAITS constexpr
+# endif
+#elif defined(_LIBCPP_VERSION) && FMT_CPLUSPLUS >= 201703L && \
+ _LIBCPP_VERSION >= 4000
+# define FMT_CONSTEXPR_CHAR_TRAITS constexpr
+#elif FMT_MSC_VERSION >= 1914 && FMT_CPLUSPLUS >= 201703L
+# define FMT_CONSTEXPR_CHAR_TRAITS constexpr
+#endif
+#ifndef FMT_CONSTEXPR_CHAR_TRAITS
+# define FMT_CONSTEXPR_CHAR_TRAITS
+#endif
+
+// Check if exceptions are disabled.
+#ifndef FMT_EXCEPTIONS
+# if (defined(__GNUC__) && !defined(__EXCEPTIONS)) || \
+ (FMT_MSC_VERSION && !_HAS_EXCEPTIONS)
+# define FMT_EXCEPTIONS 0
+# else
+# define FMT_EXCEPTIONS 1
+# endif
+#endif
+
+// Disable [[noreturn]] on MSVC/NVCC because of bogus unreachable code warnings.
+#if FMT_EXCEPTIONS && FMT_HAS_CPP_ATTRIBUTE(noreturn) && !FMT_MSC_VERSION && \
+ !defined(__NVCC__)
+# define FMT_NORETURN [[noreturn]]
+#else
+# define FMT_NORETURN
+#endif
+
+#ifndef FMT_NODISCARD
+# if FMT_HAS_CPP17_ATTRIBUTE(nodiscard)
+# define FMT_NODISCARD [[nodiscard]]
+# else
+# define FMT_NODISCARD
+# endif
+#endif
+
+#ifndef FMT_INLINE
+# if FMT_GCC_VERSION || FMT_CLANG_VERSION
+# define FMT_INLINE inline __attribute__((always_inline))
+# else
+# define FMT_INLINE inline
+# endif
+#endif
+
+#ifdef _MSC_VER
+# define FMT_UNCHECKED_ITERATOR(It) \
+ using _Unchecked_type = It // Mark iterator as checked.
+#else
+# define FMT_UNCHECKED_ITERATOR(It) using unchecked_type = It
+#endif
+
+#ifndef FMT_BEGIN_NAMESPACE
+# define FMT_BEGIN_NAMESPACE \
+ namespace fmt { \
+ inline namespace v10 {
+# define FMT_END_NAMESPACE \
+ } \
+ }
+#endif
+
+#ifndef FMT_EXPORT
+# define FMT_EXPORT
+# define FMT_BEGIN_EXPORT
+# define FMT_END_EXPORT
+#endif
+
+#if FMT_GCC_VERSION || FMT_CLANG_VERSION
+# define FMT_VISIBILITY(value) __attribute__((visibility(value)))
+#else
+# define FMT_VISIBILITY(value)
+#endif
+
+#if !defined(FMT_HEADER_ONLY) && defined(_WIN32)
+# if defined(FMT_LIB_EXPORT)
+# define FMT_API __declspec(dllexport)
+# elif defined(FMT_SHARED)
+# define FMT_API __declspec(dllimport)
+# endif
+#elif defined(FMT_LIB_EXPORT) || defined(FMT_SHARED)
+# define FMT_API FMT_VISIBILITY("default")
+#endif
+#ifndef FMT_API
+# define FMT_API
+#endif
+
+// libc++ supports string_view in pre-c++17.
+#if FMT_HAS_INCLUDE(<string_view>) && \
+ (FMT_CPLUSPLUS >= 201703L || defined(_LIBCPP_VERSION))
+# include <string_view>
+# define FMT_USE_STRING_VIEW
+#elif FMT_HAS_INCLUDE("experimental/string_view") && FMT_CPLUSPLUS >= 201402L
+# include <experimental/string_view>
+# define FMT_USE_EXPERIMENTAL_STRING_VIEW
+#endif
+
+#ifndef FMT_UNICODE
+# define FMT_UNICODE !FMT_MSC_VERSION
+#endif
+
+#ifndef FMT_CONSTEVAL
+# if ((FMT_GCC_VERSION >= 1000 || FMT_CLANG_VERSION >= 1101) && \
+ (!defined(__apple_build_version__) || \
+ __apple_build_version__ >= 14000029L) && \
+ FMT_CPLUSPLUS >= 202002L) || \
+ (defined(__cpp_consteval) && \
+ (!FMT_MSC_VERSION || FMT_MSC_VERSION >= 1929))
+// consteval is broken in MSVC before VS2019 version 16.10 and Apple clang
+// before 14.
+# define FMT_CONSTEVAL consteval
+# define FMT_HAS_CONSTEVAL
+# else
+# define FMT_CONSTEVAL
+# endif
+#endif
+
+#ifndef FMT_USE_NONTYPE_TEMPLATE_ARGS
+# if defined(__cpp_nontype_template_args) && \
+ ((FMT_GCC_VERSION >= 903 && FMT_CPLUSPLUS >= 201709L) || \
+ __cpp_nontype_template_args >= 201911L) && \
+ !defined(__NVCOMPILER) && !defined(__LCC__)
+# define FMT_USE_NONTYPE_TEMPLATE_ARGS 1
+# else
+# define FMT_USE_NONTYPE_TEMPLATE_ARGS 0
+# endif
+#endif
+
+// GCC < 5 requires this-> in decltype
+#ifndef FMT_DECLTYPE_THIS
+# if FMT_GCC_VERSION && FMT_GCC_VERSION < 500
+# define FMT_DECLTYPE_THIS this->
+# else
+# define FMT_DECLTYPE_THIS
+# endif
+#endif
+
+// Enable minimal optimizations for more compact code in debug mode.
+FMT_GCC_PRAGMA("GCC push_options")
+#if !defined(__OPTIMIZE__) && !defined(__NVCOMPILER) && !defined(__LCC__) && \
+ !defined(__CUDACC__)
+FMT_GCC_PRAGMA("GCC optimize(\"Og\")")
+#endif
+
+FMT_BEGIN_NAMESPACE
+
+// Implementations of enable_if_t and other metafunctions for older systems.
+template <bool B, typename T = void>
+using enable_if_t = typename std::enable_if<B, T>::type;
+template <bool B, typename T, typename F>
+using conditional_t = typename std::conditional<B, T, F>::type;
+template <bool B> using bool_constant = std::integral_constant<bool, B>;
+template <typename T>
+using remove_reference_t = typename std::remove_reference<T>::type;
+template <typename T>
+using remove_const_t = typename std::remove_const<T>::type;
+template <typename T>
+using remove_cvref_t = typename std::remove_cv<remove_reference_t<T>>::type;
+template <typename T> struct type_identity {
+ using type = T;
+};
+template <typename T> using type_identity_t = typename type_identity<T>::type;
+template <typename T>
+using underlying_t = typename std::underlying_type<T>::type;
+
+// Checks whether T is a container with contiguous storage.
+template <typename T> struct is_contiguous : std::false_type {};
+template <typename Char>
+struct is_contiguous<std::basic_string<Char>> : std::true_type {};
+
+struct monostate {
+ constexpr monostate() {}
+};
+
+// An enable_if helper to be used in template parameters which results in much
+// shorter symbols: https://godbolt.org/z/sWw4vP. Extra parentheses are needed
+// to workaround a bug in MSVC 2019 (see #1140 and #1186).
+#ifdef FMT_DOC
+# define FMT_ENABLE_IF(...)
+#else
+# define FMT_ENABLE_IF(...) fmt::enable_if_t<(__VA_ARGS__), int> = 0
+#endif
+
+// This is defined in core.h instead of format.h to avoid injecting in std.
+// It is a template to avoid undesirable implicit conversions to std::byte.
+#ifdef __cpp_lib_byte
+template <typename T, FMT_ENABLE_IF(std::is_same<T, std::byte>::value)>
+inline auto format_as(T b) -> unsigned char {
+ return static_cast<unsigned char>(b);
+}
+#endif
+
+namespace detail {
+// Suppresses "unused variable" warnings with the method described in
+// https://herbsutter.com/2009/10/18/mailbag-shutting-up-compiler-warnings/.
+// (void)var does not work on many Intel compilers.
+template <typename... T> FMT_CONSTEXPR void ignore_unused(const T&...) {}
+
+constexpr FMT_INLINE auto is_constant_evaluated(
+ bool default_value = false) noexcept -> bool {
+// Workaround for incompatibility between libstdc++ consteval-based
+// std::is_constant_evaluated() implementation and clang-14.
+// https://github.com/fmtlib/fmt/issues/3247
+#if FMT_CPLUSPLUS >= 202002L && defined(_GLIBCXX_RELEASE) && \
+ _GLIBCXX_RELEASE >= 12 && \
+ (FMT_CLANG_VERSION >= 1400 && FMT_CLANG_VERSION < 1500)
+ ignore_unused(default_value);
+ return __builtin_is_constant_evaluated();
+#elif defined(__cpp_lib_is_constant_evaluated)
+ ignore_unused(default_value);
+ return std::is_constant_evaluated();
+#else
+ return default_value;
+#endif
+}
+
+// Suppresses "conditional expression is constant" warnings.
+template <typename T> constexpr FMT_INLINE auto const_check(T value) -> T {
+ return value;
+}
+
+FMT_NORETURN FMT_API void assert_fail(const char* file, int line,
+ const char* message);
+
+#ifndef FMT_ASSERT
+# ifdef NDEBUG
+// FMT_ASSERT is not empty to avoid -Wempty-body.
+# define FMT_ASSERT(condition, message) \
+ fmt::detail::ignore_unused((condition), (message))
+# else
+# define FMT_ASSERT(condition, message) \
+ ((condition) /* void() fails with -Winvalid-constexpr on clang 4.0.1 */ \
+ ? (void)0 \
+ : fmt::detail::assert_fail(__FILE__, __LINE__, (message)))
+# endif
+#endif
+
+#if defined(FMT_USE_STRING_VIEW)
+template <typename Char> using std_string_view = std::basic_string_view<Char>;
+#elif defined(FMT_USE_EXPERIMENTAL_STRING_VIEW)
+template <typename Char>
+using std_string_view = std::experimental::basic_string_view<Char>;
+#else
+template <typename T> struct std_string_view {};
+#endif
+
+#ifdef FMT_USE_INT128
+// Do nothing.
+#elif defined(__SIZEOF_INT128__) && !defined(__NVCC__) && \
+ !(FMT_CLANG_VERSION && FMT_MSC_VERSION)
+# define FMT_USE_INT128 1
+using int128_opt = __int128_t; // An optional native 128-bit integer.
+using uint128_opt = __uint128_t;
+template <typename T> inline auto convert_for_visit(T value) -> T {
+ return value;
+}
+#else
+# define FMT_USE_INT128 0
+#endif
+#if !FMT_USE_INT128
+enum class int128_opt {};
+enum class uint128_opt {};
+// Reduce template instantiations.
+template <typename T> auto convert_for_visit(T) -> monostate { return {}; }
+#endif
+
+// Casts a nonnegative integer to unsigned.
+template <typename Int>
+FMT_CONSTEXPR auto to_unsigned(Int value) ->
+ typename std::make_unsigned<Int>::type {
+ FMT_ASSERT(std::is_unsigned<Int>::value || value >= 0, "negative value");
+ return static_cast<typename std::make_unsigned<Int>::type>(value);
+}
+
+FMT_CONSTEXPR inline auto is_utf8() -> bool {
+ FMT_MSC_WARNING(suppress : 4566) constexpr unsigned char section[] = "\u00A7";
+
+ // Avoid buggy sign extensions in MSVC's constant evaluation mode (#2297).
+ using uchar = unsigned char;
+ return FMT_UNICODE || (sizeof(section) == 3 && uchar(section[0]) == 0xC2 &&
+ uchar(section[1]) == 0xA7);
+}
+} // namespace detail
+
+/**
+ An implementation of ``std::basic_string_view`` for pre-C++17. It provides a
+ subset of the API. ``fmt::basic_string_view`` is used for format strings even
+ if ``std::string_view`` is available to prevent issues when a library is
+ compiled with a different ``-std`` option than the client code (which is not
+ recommended).
+ */
+FMT_EXPORT
+template <typename Char> class basic_string_view {
+ private:
+ const Char* data_;
+ size_t size_;
+
+ public:
+ using value_type = Char;
+ using iterator = const Char*;
+
+ constexpr basic_string_view() noexcept : data_(nullptr), size_(0) {}
+
+ /** Constructs a string reference object from a C string and a size. */
+ constexpr basic_string_view(const Char* s, size_t count) noexcept
+ : data_(s), size_(count) {}
+
+ /**
+ \rst
+ Constructs a string reference object from a C string computing
+ the size with ``std::char_traits<Char>::length``.
+ \endrst
+ */
+ FMT_CONSTEXPR_CHAR_TRAITS
+ FMT_INLINE
+ basic_string_view(const Char* s)
+ : data_(s),
+ size_(detail::const_check(std::is_same<Char, char>::value &&
+ !detail::is_constant_evaluated(true))
+ ? std::strlen(reinterpret_cast<const char*>(s))
+ : std::char_traits<Char>::length(s)) {}
+
+ /** Constructs a string reference from a ``std::basic_string`` object. */
+ template <typename Traits, typename Alloc>
+ FMT_CONSTEXPR basic_string_view(
+ const std::basic_string<Char, Traits, Alloc>& s) noexcept
+ : data_(s.data()), size_(s.size()) {}
+
+ template <typename S, FMT_ENABLE_IF(std::is_same<
+ S, detail::std_string_view<Char>>::value)>
+ FMT_CONSTEXPR basic_string_view(S s) noexcept
+ : data_(s.data()), size_(s.size()) {}
+
+ /** Returns a pointer to the string data. */
+ constexpr auto data() const noexcept -> const Char* { return data_; }
+
+ /** Returns the string size. */
+ constexpr auto size() const noexcept -> size_t { return size_; }
+
+ constexpr auto begin() const noexcept -> iterator { return data_; }
+ constexpr auto end() const noexcept -> iterator { return data_ + size_; }
+
+ constexpr auto operator[](size_t pos) const noexcept -> const Char& {
+ return data_[pos];
+ }
+
+ FMT_CONSTEXPR void remove_prefix(size_t n) noexcept {
+ data_ += n;
+ size_ -= n;
+ }
+
+ FMT_CONSTEXPR_CHAR_TRAITS auto starts_with(
+ basic_string_view<Char> sv) const noexcept -> bool {
+ return size_ >= sv.size_ &&
+ std::char_traits<Char>::compare(data_, sv.data_, sv.size_) == 0;
+ }
+ FMT_CONSTEXPR_CHAR_TRAITS auto starts_with(Char c) const noexcept -> bool {
+ return size_ >= 1 && std::char_traits<Char>::eq(*data_, c);
+ }
+ FMT_CONSTEXPR_CHAR_TRAITS auto starts_with(const Char* s) const -> bool {
+ return starts_with(basic_string_view<Char>(s));
+ }
+
+ // Lexicographically compare this string reference to other.
+ FMT_CONSTEXPR_CHAR_TRAITS auto compare(basic_string_view other) const -> int {
+ size_t str_size = size_ < other.size_ ? size_ : other.size_;
+ int result = std::char_traits<Char>::compare(data_, other.data_, str_size);
+ if (result == 0)
+ result = size_ == other.size_ ? 0 : (size_ < other.size_ ? -1 : 1);
+ return result;
+ }
+
+ FMT_CONSTEXPR_CHAR_TRAITS friend auto operator==(basic_string_view lhs,
+ basic_string_view rhs)
+ -> bool {
+ return lhs.compare(rhs) == 0;
+ }
+ friend auto operator!=(basic_string_view lhs, basic_string_view rhs) -> bool {
+ return lhs.compare(rhs) != 0;
+ }
+ friend auto operator<(basic_string_view lhs, basic_string_view rhs) -> bool {
+ return lhs.compare(rhs) < 0;
+ }
+ friend auto operator<=(basic_string_view lhs, basic_string_view rhs) -> bool {
+ return lhs.compare(rhs) <= 0;
+ }
+ friend auto operator>(basic_string_view lhs, basic_string_view rhs) -> bool {
+ return lhs.compare(rhs) > 0;
+ }
+ friend auto operator>=(basic_string_view lhs, basic_string_view rhs) -> bool {
+ return lhs.compare(rhs) >= 0;
+ }
+};
+
+FMT_EXPORT
+using string_view = basic_string_view<char>;
+
+/** Specifies if ``T`` is a character type. Can be specialized by users. */
+FMT_EXPORT
+template <typename T> struct is_char : std::false_type {};
+template <> struct is_char<char> : std::true_type {};
+
+namespace detail {
+
+// A base class for compile-time strings.
+struct compile_string {};
+
+template <typename S>
+struct is_compile_string : std::is_base_of<compile_string, S> {};
+
+template <typename Char, FMT_ENABLE_IF(is_char<Char>::value)>
+FMT_INLINE auto to_string_view(const Char* s) -> basic_string_view<Char> {
+ return s;
+}
+template <typename Char, typename Traits, typename Alloc>
+inline auto to_string_view(const std::basic_string<Char, Traits, Alloc>& s)
+ -> basic_string_view<Char> {
+ return s;
+}
+template <typename Char>
+constexpr auto to_string_view(basic_string_view<Char> s)
+ -> basic_string_view<Char> {
+ return s;
+}
+template <typename Char,
+ FMT_ENABLE_IF(!std::is_empty<std_string_view<Char>>::value)>
+inline auto to_string_view(std_string_view<Char> s) -> basic_string_view<Char> {
+ return s;
+}
+template <typename S, FMT_ENABLE_IF(is_compile_string<S>::value)>
+constexpr auto to_string_view(const S& s)
+ -> basic_string_view<typename S::char_type> {
+ return basic_string_view<typename S::char_type>(s);
+}
+void to_string_view(...);
+
+// Specifies whether S is a string type convertible to fmt::basic_string_view.
+// It should be a constexpr function but MSVC 2017 fails to compile it in
+// enable_if and MSVC 2015 fails to compile it as an alias template.
+// ADL is intentionally disabled as to_string_view is not an extension point.
+template <typename S>
+struct is_string
+ : std::is_class<decltype(detail::to_string_view(std::declval<S>()))> {};
+
+template <typename S, typename = void> struct char_t_impl {};
+template <typename S> struct char_t_impl<S, enable_if_t<is_string<S>::value>> {
+ using result = decltype(to_string_view(std::declval<S>()));
+ using type = typename result::value_type;
+};
+
+enum class type {
+ none_type,
+ // Integer types should go first,
+ int_type,
+ uint_type,
+ long_long_type,
+ ulong_long_type,
+ int128_type,
+ uint128_type,
+ bool_type,
+ char_type,
+ last_integer_type = char_type,
+ // followed by floating-point types.
+ float_type,
+ double_type,
+ long_double_type,
+ last_numeric_type = long_double_type,
+ cstring_type,
+ string_type,
+ pointer_type,
+ custom_type
+};
+
+// Maps core type T to the corresponding type enum constant.
+template <typename T, typename Char>
+struct type_constant : std::integral_constant<type, type::custom_type> {};
+
+#define FMT_TYPE_CONSTANT(Type, constant) \
+ template <typename Char> \
+ struct type_constant<Type, Char> \
+ : std::integral_constant<type, type::constant> {}
+
+FMT_TYPE_CONSTANT(int, int_type);
+FMT_TYPE_CONSTANT(unsigned, uint_type);
+FMT_TYPE_CONSTANT(long long, long_long_type);
+FMT_TYPE_CONSTANT(unsigned long long, ulong_long_type);
+FMT_TYPE_CONSTANT(int128_opt, int128_type);
+FMT_TYPE_CONSTANT(uint128_opt, uint128_type);
+FMT_TYPE_CONSTANT(bool, bool_type);
+FMT_TYPE_CONSTANT(Char, char_type);
+FMT_TYPE_CONSTANT(float, float_type);
+FMT_TYPE_CONSTANT(double, double_type);
+FMT_TYPE_CONSTANT(long double, long_double_type);
+FMT_TYPE_CONSTANT(const Char*, cstring_type);
+FMT_TYPE_CONSTANT(basic_string_view<Char>, string_type);
+FMT_TYPE_CONSTANT(const void*, pointer_type);
+
+constexpr auto is_integral_type(type t) -> bool {
+ return t > type::none_type && t <= type::last_integer_type;
+}
+constexpr auto is_arithmetic_type(type t) -> bool {
+ return t > type::none_type && t <= type::last_numeric_type;
+}
+
+constexpr auto set(type rhs) -> int { return 1 << static_cast<int>(rhs); }
+constexpr auto in(type t, int set) -> bool {
+ return ((set >> static_cast<int>(t)) & 1) != 0;
+}
+
+// Bitsets of types.
+enum {
+ sint_set =
+ set(type::int_type) | set(type::long_long_type) | set(type::int128_type),
+ uint_set = set(type::uint_type) | set(type::ulong_long_type) |
+ set(type::uint128_type),
+ bool_set = set(type::bool_type),
+ char_set = set(type::char_type),
+ float_set = set(type::float_type) | set(type::double_type) |
+ set(type::long_double_type),
+ string_set = set(type::string_type),
+ cstring_set = set(type::cstring_type),
+ pointer_set = set(type::pointer_type)
+};
+
+// DEPRECATED!
+FMT_NORETURN FMT_API void throw_format_error(const char* message);
+
+struct error_handler {
+ constexpr error_handler() = default;
+
+ // This function is intentionally not constexpr to give a compile-time error.
+ FMT_NORETURN void on_error(const char* message) {
+ throw_format_error(message);
+ }
+};
+} // namespace detail
+
+/** Throws ``format_error`` with a given message. */
+using detail::throw_format_error;
+
+/** String's character type. */
+template <typename S> using char_t = typename detail::char_t_impl<S>::type;
+
+/**
+ \rst
+ Parsing context consisting of a format string range being parsed and an
+ argument counter for automatic indexing.
+ You can use the ``format_parse_context`` type alias for ``char`` instead.
+ \endrst
+ */
+FMT_EXPORT
+template <typename Char> class basic_format_parse_context {
+ private:
+ basic_string_view<Char> format_str_;
+ int next_arg_id_;
+
+ FMT_CONSTEXPR void do_check_arg_id(int id);
+
+ public:
+ using char_type = Char;
+ using iterator = const Char*;
+
+ explicit constexpr basic_format_parse_context(
+ basic_string_view<Char> format_str, int next_arg_id = 0)
+ : format_str_(format_str), next_arg_id_(next_arg_id) {}
+
+ /**
+ Returns an iterator to the beginning of the format string range being
+ parsed.
+ */
+ constexpr auto begin() const noexcept -> iterator {
+ return format_str_.begin();
+ }
+
+ /**
+ Returns an iterator past the end of the format string range being parsed.
+ */
+ constexpr auto end() const noexcept -> iterator { return format_str_.end(); }
+
+ /** Advances the begin iterator to ``it``. */
+ FMT_CONSTEXPR void advance_to(iterator it) {
+ format_str_.remove_prefix(detail::to_unsigned(it - begin()));
+ }
+
+ /**
+ Reports an error if using the manual argument indexing; otherwise returns
+ the next argument index and switches to the automatic indexing.
+ */
+ FMT_CONSTEXPR auto next_arg_id() -> int {
+ if (next_arg_id_ < 0) {
+ detail::throw_format_error(
+ "cannot switch from manual to automatic argument indexing");
+ return 0;
+ }
+ int id = next_arg_id_++;
+ do_check_arg_id(id);
+ return id;
+ }
+
+ /**
+ Reports an error if using the automatic argument indexing; otherwise
+ switches to the manual indexing.
+ */
+ FMT_CONSTEXPR void check_arg_id(int id) {
+ if (next_arg_id_ > 0) {
+ detail::throw_format_error(
+ "cannot switch from automatic to manual argument indexing");
+ return;
+ }
+ next_arg_id_ = -1;
+ do_check_arg_id(id);
+ }
+ FMT_CONSTEXPR void check_arg_id(basic_string_view<Char>) {}
+ FMT_CONSTEXPR void check_dynamic_spec(int arg_id);
+};
+
+FMT_EXPORT
+using format_parse_context = basic_format_parse_context<char>;
+
+namespace detail {
+// A parse context with extra data used only in compile-time checks.
+template <typename Char>
+class compile_parse_context : public basic_format_parse_context<Char> {
+ private:
+ int num_args_;
+ const type* types_;
+ using base = basic_format_parse_context<Char>;
+
+ public:
+ explicit FMT_CONSTEXPR compile_parse_context(
+ basic_string_view<Char> format_str, int num_args, const type* types,
+ int next_arg_id = 0)
+ : base(format_str, next_arg_id), num_args_(num_args), types_(types) {}
+
+ constexpr auto num_args() const -> int { return num_args_; }
+ constexpr auto arg_type(int id) const -> type { return types_[id]; }
+
+ FMT_CONSTEXPR auto next_arg_id() -> int {
+ int id = base::next_arg_id();
+ if (id >= num_args_) throw_format_error("argument not found");
+ return id;
+ }
+
+ FMT_CONSTEXPR void check_arg_id(int id) {
+ base::check_arg_id(id);
+ if (id >= num_args_) throw_format_error("argument not found");
+ }
+ using base::check_arg_id;
+
+ FMT_CONSTEXPR void check_dynamic_spec(int arg_id) {
+ detail::ignore_unused(arg_id);
+#if !defined(__LCC__)
+ if (arg_id < num_args_ && types_ && !is_integral_type(types_[arg_id]))
+ throw_format_error("width/precision is not integer");
+#endif
+ }
+};
+
+// Extracts a reference to the container from back_insert_iterator.
+template <typename Container>
+inline auto get_container(std::back_insert_iterator<Container> it)
+ -> Container& {
+ using base = std::back_insert_iterator<Container>;
+ struct accessor : base {
+ accessor(base b) : base(b) {}
+ using base::container;
+ };
+ return *accessor(it).container;
+}
+
+template <typename Char, typename InputIt, typename OutputIt>
+FMT_CONSTEXPR auto copy_str(InputIt begin, InputIt end, OutputIt out)
+ -> OutputIt {
+ while (begin != end) *out++ = static_cast<Char>(*begin++);
+ return out;
+}
+
+template <typename Char, typename T, typename U,
+ FMT_ENABLE_IF(
+ std::is_same<remove_const_t<T>, U>::value&& is_char<U>::value)>
+FMT_CONSTEXPR auto copy_str(T* begin, T* end, U* out) -> U* {
+ if (is_constant_evaluated()) return copy_str<Char, T*, U*>(begin, end, out);
+ auto size = to_unsigned(end - begin);
+ if (size > 0) memcpy(out, begin, size * sizeof(U));
+ return out + size;
+}
+
+/**
+ \rst
+ A contiguous memory buffer with an optional growing ability. It is an internal
+ class and shouldn't be used directly, only via `~fmt::basic_memory_buffer`.
+ \endrst
+ */
+template <typename T> class buffer {
+ private:
+ T* ptr_;
+ size_t size_;
+ size_t capacity_;
+
+ protected:
+ // Don't initialize ptr_ since it is not accessed to save a few cycles.
+ FMT_MSC_WARNING(suppress : 26495)
+ FMT_CONSTEXPR buffer(size_t sz) noexcept : size_(sz), capacity_(sz) {}
+
+ FMT_CONSTEXPR20 buffer(T* p = nullptr, size_t sz = 0, size_t cap = 0) noexcept
+ : ptr_(p), size_(sz), capacity_(cap) {}
+
+ FMT_CONSTEXPR20 ~buffer() = default;
+ buffer(buffer&&) = default;
+
+ /** Sets the buffer data and capacity. */
+ FMT_CONSTEXPR void set(T* buf_data, size_t buf_capacity) noexcept {
+ ptr_ = buf_data;
+ capacity_ = buf_capacity;
+ }
+
+ /** Increases the buffer capacity to hold at least *capacity* elements. */
+ // DEPRECATED!
+ virtual FMT_CONSTEXPR20 void grow(size_t capacity) = 0;
+
+ public:
+ using value_type = T;
+ using const_reference = const T&;
+
+ buffer(const buffer&) = delete;
+ void operator=(const buffer&) = delete;
+
+ FMT_INLINE auto begin() noexcept -> T* { return ptr_; }
+ FMT_INLINE auto end() noexcept -> T* { return ptr_ + size_; }
+
+ FMT_INLINE auto begin() const noexcept -> const T* { return ptr_; }
+ FMT_INLINE auto end() const noexcept -> const T* { return ptr_ + size_; }
+
+ /** Returns the size of this buffer. */
+ constexpr auto size() const noexcept -> size_t { return size_; }
+
+ /** Returns the capacity of this buffer. */
+ constexpr auto capacity() const noexcept -> size_t { return capacity_; }
+
+ /** Returns a pointer to the buffer data (not null-terminated). */
+ FMT_CONSTEXPR auto data() noexcept -> T* { return ptr_; }
+ FMT_CONSTEXPR auto data() const noexcept -> const T* { return ptr_; }
+
+ /** Clears this buffer. */
+ void clear() { size_ = 0; }
+
+ // Tries resizing the buffer to contain *count* elements. If T is a POD type
+ // the new elements may not be initialized.
+ FMT_CONSTEXPR20 void try_resize(size_t count) {
+ try_reserve(count);
+ size_ = count <= capacity_ ? count : capacity_;
+ }
+
+ // Tries increasing the buffer capacity to *new_capacity*. It can increase the
+ // capacity by a smaller amount than requested but guarantees there is space
+ // for at least one additional element either by increasing the capacity or by
+ // flushing the buffer if it is full.
+ FMT_CONSTEXPR20 void try_reserve(size_t new_capacity) {
+ if (new_capacity > capacity_) grow(new_capacity);
+ }
+
+ FMT_CONSTEXPR20 void push_back(const T& value) {
+ try_reserve(size_ + 1);
+ ptr_[size_++] = value;
+ }
+
+ /** Appends data to the end of the buffer. */
+ template <typename U> void append(const U* begin, const U* end);
+
+ template <typename Idx> FMT_CONSTEXPR auto operator[](Idx index) -> T& {
+ return ptr_[index];
+ }
+ template <typename Idx>
+ FMT_CONSTEXPR auto operator[](Idx index) const -> const T& {
+ return ptr_[index];
+ }
+};
+
+struct buffer_traits {
+ explicit buffer_traits(size_t) {}
+ auto count() const -> size_t { return 0; }
+ auto limit(size_t size) -> size_t { return size; }
+};
+
+class fixed_buffer_traits {
+ private:
+ size_t count_ = 0;
+ size_t limit_;
+
+ public:
+ explicit fixed_buffer_traits(size_t limit) : limit_(limit) {}
+ auto count() const -> size_t { return count_; }
+ auto limit(size_t size) -> size_t {
+ size_t n = limit_ > count_ ? limit_ - count_ : 0;
+ count_ += size;
+ return size < n ? size : n;
+ }
+};
+
+// A buffer that writes to an output iterator when flushed.
+template <typename OutputIt, typename T, typename Traits = buffer_traits>
+class iterator_buffer final : public Traits, public buffer<T> {
+ private:
+ OutputIt out_;
+ enum { buffer_size = 256 };
+ T data_[buffer_size];
+
+ protected:
+ FMT_CONSTEXPR20 void grow(size_t) override {
+ if (this->size() == buffer_size) flush();
+ }
+
+ void flush() {
+ auto size = this->size();
+ this->clear();
+ out_ = copy_str<T>(data_, data_ + this->limit(size), out_);
+ }
+
+ public:
+ explicit iterator_buffer(OutputIt out, size_t n = buffer_size)
+ : Traits(n), buffer<T>(data_, 0, buffer_size), out_(out) {}
+ iterator_buffer(iterator_buffer&& other)
+ : Traits(other), buffer<T>(data_, 0, buffer_size), out_(other.out_) {}
+ ~iterator_buffer() { flush(); }
+
+ auto out() -> OutputIt {
+ flush();
+ return out_;
+ }
+ auto count() const -> size_t { return Traits::count() + this->size(); }
+};
+
+template <typename T>
+class iterator_buffer<T*, T, fixed_buffer_traits> final
+ : public fixed_buffer_traits,
+ public buffer<T> {
+ private:
+ T* out_;
+ enum { buffer_size = 256 };
+ T data_[buffer_size];
+
+ protected:
+ FMT_CONSTEXPR20 void grow(size_t) override {
+ if (this->size() == this->capacity()) flush();
+ }
+
+ void flush() {
+ size_t n = this->limit(this->size());
+ if (this->data() == out_) {
+ out_ += n;
+ this->set(data_, buffer_size);
+ }
+ this->clear();
+ }
+
+ public:
+ explicit iterator_buffer(T* out, size_t n = buffer_size)
+ : fixed_buffer_traits(n), buffer<T>(out, 0, n), out_(out) {}
+ iterator_buffer(iterator_buffer&& other)
+ : fixed_buffer_traits(other),
+ buffer<T>(std::move(other)),
+ out_(other.out_) {
+ if (this->data() != out_) {
+ this->set(data_, buffer_size);
+ this->clear();
+ }
+ }
+ ~iterator_buffer() { flush(); }
+
+ auto out() -> T* {
+ flush();
+ return out_;
+ }
+ auto count() const -> size_t {
+ return fixed_buffer_traits::count() + this->size();
+ }
+};
+
+template <typename T> class iterator_buffer<T*, T> final : public buffer<T> {
+ protected:
+ FMT_CONSTEXPR20 void grow(size_t) override {}
+
+ public:
+ explicit iterator_buffer(T* out, size_t = 0) : buffer<T>(out, 0, ~size_t()) {}
+
+ auto out() -> T* { return &*this->end(); }
+};
+
+// A buffer that writes to a container with the contiguous storage.
+template <typename Container>
+class iterator_buffer<std::back_insert_iterator<Container>,
+ enable_if_t<is_contiguous<Container>::value,
+ typename Container::value_type>>
+ final : public buffer<typename Container::value_type> {
+ private:
+ Container& container_;
+
+ protected:
+ FMT_CONSTEXPR20 void grow(size_t capacity) override {
+ container_.resize(capacity);
+ this->set(&container_[0], capacity);
+ }
+
+ public:
+ explicit iterator_buffer(Container& c)
+ : buffer<typename Container::value_type>(c.size()), container_(c) {}
+ explicit iterator_buffer(std::back_insert_iterator<Container> out, size_t = 0)
+ : iterator_buffer(get_container(out)) {}
+
+ auto out() -> std::back_insert_iterator<Container> {
+ return std::back_inserter(container_);
+ }
+};
+
+// A buffer that counts the number of code units written discarding the output.
+template <typename T = char> class counting_buffer final : public buffer<T> {
+ private:
+ enum { buffer_size = 256 };
+ T data_[buffer_size];
+ size_t count_ = 0;
+
+ protected:
+ FMT_CONSTEXPR20 void grow(size_t) override {
+ if (this->size() != buffer_size) return;
+ count_ += this->size();
+ this->clear();
+ }
+
+ public:
+ counting_buffer() : buffer<T>(data_, 0, buffer_size) {}
+
+ auto count() -> size_t { return count_ + this->size(); }
+};
+} // namespace detail
+
+template <typename Char>
+FMT_CONSTEXPR void basic_format_parse_context<Char>::do_check_arg_id(int id) {
+ // Argument id is only checked at compile-time during parsing because
+ // formatting has its own validation.
+ if (detail::is_constant_evaluated() &&
+ (!FMT_GCC_VERSION || FMT_GCC_VERSION >= 1200)) {
+ using context = detail::compile_parse_context<Char>;
+ if (id >= static_cast<context*>(this)->num_args())
+ detail::throw_format_error("argument not found");
+ }
+}
+
+template <typename Char>
+FMT_CONSTEXPR void basic_format_parse_context<Char>::check_dynamic_spec(
+ int arg_id) {
+ if (detail::is_constant_evaluated() &&
+ (!FMT_GCC_VERSION || FMT_GCC_VERSION >= 1200)) {
+ using context = detail::compile_parse_context<Char>;
+ static_cast<context*>(this)->check_dynamic_spec(arg_id);
+ }
+}
+
+FMT_EXPORT template <typename Context> class basic_format_arg;
+FMT_EXPORT template <typename Context> class basic_format_args;
+FMT_EXPORT template <typename Context> class dynamic_format_arg_store;
+
+// A formatter for objects of type T.
+FMT_EXPORT
+template <typename T, typename Char = char, typename Enable = void>
+struct formatter {
+ // A deleted default constructor indicates a disabled formatter.
+ formatter() = delete;
+};
+
+// Specifies if T has an enabled formatter specialization. A type can be
+// formattable even if it doesn't have a formatter e.g. via a conversion.
+template <typename T, typename Context>
+using has_formatter =
+ std::is_constructible<typename Context::template formatter_type<T>>;
+
+// An output iterator that appends to a buffer.
+// It is used to reduce symbol sizes for the common case.
+class appender : public std::back_insert_iterator<detail::buffer<char>> {
+ using base = std::back_insert_iterator<detail::buffer<char>>;
+
+ public:
+ using std::back_insert_iterator<detail::buffer<char>>::back_insert_iterator;
+ appender(base it) noexcept : base(it) {}
+ FMT_UNCHECKED_ITERATOR(appender);
+
+ auto operator++() noexcept -> appender& { return *this; }
+ auto operator++(int) noexcept -> appender { return *this; }
+};
+
+namespace detail {
+
+template <typename Context, typename T>
+constexpr auto has_const_formatter_impl(T*)
+ -> decltype(typename Context::template formatter_type<T>().format(
+ std::declval<const T&>(), std::declval<Context&>()),
+ true) {
+ return true;
+}
+template <typename Context>
+constexpr auto has_const_formatter_impl(...) -> bool {
+ return false;
+}
+template <typename T, typename Context>
+constexpr auto has_const_formatter() -> bool {
+ return has_const_formatter_impl<Context>(static_cast<T*>(nullptr));
+}
+
+template <typename T>
+using buffer_appender = conditional_t<std::is_same<T, char>::value, appender,
+ std::back_insert_iterator<buffer<T>>>;
+
+// Maps an output iterator to a buffer.
+template <typename T, typename OutputIt>
+auto get_buffer(OutputIt out) -> iterator_buffer<OutputIt, T> {
+ return iterator_buffer<OutputIt, T>(out);
+}
+template <typename T, typename Buf,
+ FMT_ENABLE_IF(std::is_base_of<buffer<char>, Buf>::value)>
+auto get_buffer(std::back_insert_iterator<Buf> out) -> buffer<char>& {
+ return get_container(out);
+}
+
+template <typename Buf, typename OutputIt>
+FMT_INLINE auto get_iterator(Buf& buf, OutputIt) -> decltype(buf.out()) {
+ return buf.out();
+}
+template <typename T, typename OutputIt>
+auto get_iterator(buffer<T>&, OutputIt out) -> OutputIt {
+ return out;
+}
+
+struct view {};
+
+template <typename Char, typename T> struct named_arg : view {
+ const Char* name;
+ const T& value;
+ named_arg(const Char* n, const T& v) : name(n), value(v) {}
+};
+
+template <typename Char> struct named_arg_info {
+ const Char* name;
+ int id;
+};
+
+template <typename T, typename Char, size_t NUM_ARGS, size_t NUM_NAMED_ARGS>
+struct arg_data {
+ // args_[0].named_args points to named_args_ to avoid bloating format_args.
+ // +1 to workaround a bug in gcc 7.5 that causes duplicated-branches warning.
+ T args_[1 + (NUM_ARGS != 0 ? NUM_ARGS : +1)];
+ named_arg_info<Char> named_args_[NUM_NAMED_ARGS];
+
+ template <typename... U>
+ arg_data(const U&... init) : args_{T(named_args_, NUM_NAMED_ARGS), init...} {}
+ arg_data(const arg_data& other) = delete;
+ auto args() const -> const T* { return args_ + 1; }
+ auto named_args() -> named_arg_info<Char>* { return named_args_; }
+};
+
+template <typename T, typename Char, size_t NUM_ARGS>
+struct arg_data<T, Char, NUM_ARGS, 0> {
+ // +1 to workaround a bug in gcc 7.5 that causes duplicated-branches warning.
+ T args_[NUM_ARGS != 0 ? NUM_ARGS : +1];
+
+ template <typename... U>
+ FMT_CONSTEXPR FMT_INLINE arg_data(const U&... init) : args_{init...} {}
+ FMT_CONSTEXPR FMT_INLINE auto args() const -> const T* { return args_; }
+ FMT_CONSTEXPR FMT_INLINE auto named_args() -> std::nullptr_t {
+ return nullptr;
+ }
+};
+
+template <typename Char>
+inline void init_named_args(named_arg_info<Char>*, int, int) {}
+
+template <typename T> struct is_named_arg : std::false_type {};
+template <typename T> struct is_statically_named_arg : std::false_type {};
+
+template <typename T, typename Char>
+struct is_named_arg<named_arg<Char, T>> : std::true_type {};
+
+template <typename Char, typename T, typename... Tail,
+ FMT_ENABLE_IF(!is_named_arg<T>::value)>
+void init_named_args(named_arg_info<Char>* named_args, int arg_count,
+ int named_arg_count, const T&, const Tail&... args) {
+ init_named_args(named_args, arg_count + 1, named_arg_count, args...);
+}
+
+template <typename Char, typename T, typename... Tail,
+ FMT_ENABLE_IF(is_named_arg<T>::value)>
+void init_named_args(named_arg_info<Char>* named_args, int arg_count,
+ int named_arg_count, const T& arg, const Tail&... args) {
+ named_args[named_arg_count++] = {arg.name, arg_count};
+ init_named_args(named_args, arg_count + 1, named_arg_count, args...);
+}
+
+template <typename... Args>
+FMT_CONSTEXPR FMT_INLINE void init_named_args(std::nullptr_t, int, int,
+ const Args&...) {}
+
+template <bool B = false> constexpr auto count() -> size_t { return B ? 1 : 0; }
+template <bool B1, bool B2, bool... Tail> constexpr auto count() -> size_t {
+ return (B1 ? 1 : 0) + count<B2, Tail...>();
+}
+
+template <typename... Args> constexpr auto count_named_args() -> size_t {
+ return count<is_named_arg<Args>::value...>();
+}
+
+template <typename... Args>
+constexpr auto count_statically_named_args() -> size_t {
+ return count<is_statically_named_arg<Args>::value...>();
+}
+
+struct unformattable {};
+struct unformattable_char : unformattable {};
+struct unformattable_pointer : unformattable {};
+
+template <typename Char> struct string_value {
+ const Char* data;
+ size_t size;
+};
+
+template <typename Char> struct named_arg_value {
+ const named_arg_info<Char>* data;
+ size_t size;
+};
+
+template <typename Context> struct custom_value {
+ using parse_context = typename Context::parse_context_type;
+ void* value;
+ void (*format)(void* arg, parse_context& parse_ctx, Context& ctx);
+};
+
+// A formatting argument value.
+template <typename Context> class value {
+ public:
+ using char_type = typename Context::char_type;
+
+ union {
+ monostate no_value;
+ int int_value;
+ unsigned uint_value;
+ long long long_long_value;
+ unsigned long long ulong_long_value;
+ int128_opt int128_value;
+ uint128_opt uint128_value;
+ bool bool_value;
+ char_type char_value;
+ float float_value;
+ double double_value;
+ long double long_double_value;
+ const void* pointer;
+ string_value<char_type> string;
+ custom_value<Context> custom;
+ named_arg_value<char_type> named_args;
+ };
+
+ constexpr FMT_INLINE value() : no_value() {}
+ constexpr FMT_INLINE value(int val) : int_value(val) {}
+ constexpr FMT_INLINE value(unsigned val) : uint_value(val) {}
+ constexpr FMT_INLINE value(long long val) : long_long_value(val) {}
+ constexpr FMT_INLINE value(unsigned long long val) : ulong_long_value(val) {}
+ FMT_INLINE value(int128_opt val) : int128_value(val) {}
+ FMT_INLINE value(uint128_opt val) : uint128_value(val) {}
+ constexpr FMT_INLINE value(float val) : float_value(val) {}
+ constexpr FMT_INLINE value(double val) : double_value(val) {}
+ FMT_INLINE value(long double val) : long_double_value(val) {}
+ constexpr FMT_INLINE value(bool val) : bool_value(val) {}
+ constexpr FMT_INLINE value(char_type val) : char_value(val) {}
+ FMT_CONSTEXPR FMT_INLINE value(const char_type* val) {
+ string.data = val;
+ if (is_constant_evaluated()) string.size = {};
+ }
+ FMT_CONSTEXPR FMT_INLINE value(basic_string_view<char_type> val) {
+ string.data = val.data();
+ string.size = val.size();
+ }
+ FMT_INLINE value(const void* val) : pointer(val) {}
+ FMT_INLINE value(const named_arg_info<char_type>* args, size_t size)
+ : named_args{args, size} {}
+
+ template <typename T> FMT_CONSTEXPR20 FMT_INLINE value(T& val) {
+ using value_type = remove_const_t<T>;
+ custom.value = const_cast<value_type*>(std::addressof(val));
+ // Get the formatter type through the context to allow different contexts
+ // have different extension points, e.g. `formatter<T>` for `format` and
+ // `printf_formatter<T>` for `printf`.
+ custom.format = format_custom_arg<
+ value_type, typename Context::template formatter_type<value_type>>;
+ }
+ value(unformattable);
+ value(unformattable_char);
+ value(unformattable_pointer);
+
+ private:
+ // Formats an argument of a custom type, such as a user-defined class.
+ template <typename T, typename Formatter>
+ static void format_custom_arg(void* arg,
+ typename Context::parse_context_type& parse_ctx,
+ Context& ctx) {
+ auto f = Formatter();
+ parse_ctx.advance_to(f.parse(parse_ctx));
+ using qualified_type =
+ conditional_t<has_const_formatter<T, Context>(), const T, T>;
+ // Calling format through a mutable reference is deprecated.
+ ctx.advance_to(f.format(*static_cast<qualified_type*>(arg), ctx));
+ }
+};
+
+// To minimize the number of types we need to deal with, long is translated
+// either to int or to long long depending on its size.
+enum { long_short = sizeof(long) == sizeof(int) };
+using long_type = conditional_t<long_short, int, long long>;
+using ulong_type = conditional_t<long_short, unsigned, unsigned long long>;
+
+template <typename T> struct format_as_result {
+ template <typename U,
+ FMT_ENABLE_IF(std::is_enum<U>::value || std::is_class<U>::value)>
+ static auto map(U*) -> remove_cvref_t<decltype(format_as(std::declval<U>()))>;
+ static auto map(...) -> void;
+
+ using type = decltype(map(static_cast<T*>(nullptr)));
+};
+template <typename T> using format_as_t = typename format_as_result<T>::type;
+
+template <typename T>
+struct has_format_as
+ : bool_constant<!std::is_same<format_as_t<T>, void>::value> {};
+
+// Maps formatting arguments to core types.
+// arg_mapper reports errors by returning unformattable instead of using
+// static_assert because it's used in the is_formattable trait.
+template <typename Context> struct arg_mapper {
+ using char_type = typename Context::char_type;
+
+ FMT_CONSTEXPR FMT_INLINE auto map(signed char val) -> int { return val; }
+ FMT_CONSTEXPR FMT_INLINE auto map(unsigned char val) -> unsigned {
+ return val;
+ }
+ FMT_CONSTEXPR FMT_INLINE auto map(short val) -> int { return val; }
+ FMT_CONSTEXPR FMT_INLINE auto map(unsigned short val) -> unsigned {
+ return val;
+ }
+ FMT_CONSTEXPR FMT_INLINE auto map(int val) -> int { return val; }
+ FMT_CONSTEXPR FMT_INLINE auto map(unsigned val) -> unsigned { return val; }
+ FMT_CONSTEXPR FMT_INLINE auto map(long val) -> long_type { return val; }
+ FMT_CONSTEXPR FMT_INLINE auto map(unsigned long val) -> ulong_type {
+ return val;
+ }
+ FMT_CONSTEXPR FMT_INLINE auto map(long long val) -> long long { return val; }
+ FMT_CONSTEXPR FMT_INLINE auto map(unsigned long long val)
+ -> unsigned long long {
+ return val;
+ }
+ FMT_CONSTEXPR FMT_INLINE auto map(int128_opt val) -> int128_opt {
+ return val;
+ }
+ FMT_CONSTEXPR FMT_INLINE auto map(uint128_opt val) -> uint128_opt {
+ return val;
+ }
+ FMT_CONSTEXPR FMT_INLINE auto map(bool val) -> bool { return val; }
+
+ template <typename T, FMT_ENABLE_IF(std::is_same<T, char>::value ||
+ std::is_same<T, char_type>::value)>
+ FMT_CONSTEXPR FMT_INLINE auto map(T val) -> char_type {
+ return val;
+ }
+ template <typename T, enable_if_t<(std::is_same<T, wchar_t>::value ||
+#ifdef __cpp_char8_t
+ std::is_same<T, char8_t>::value ||
+#endif
+ std::is_same<T, char16_t>::value ||
+ std::is_same<T, char32_t>::value) &&
+ !std::is_same<T, char_type>::value,
+ int> = 0>
+ FMT_CONSTEXPR FMT_INLINE auto map(T) -> unformattable_char {
+ return {};
+ }
+
+ FMT_CONSTEXPR FMT_INLINE auto map(float val) -> float { return val; }
+ FMT_CONSTEXPR FMT_INLINE auto map(double val) -> double { return val; }
+ FMT_CONSTEXPR FMT_INLINE auto map(long double val) -> long double {
+ return val;
+ }
+
+ FMT_CONSTEXPR FMT_INLINE auto map(char_type* val) -> const char_type* {
+ return val;
+ }
+ FMT_CONSTEXPR FMT_INLINE auto map(const char_type* val) -> const char_type* {
+ return val;
+ }
+ template <typename T,
+ FMT_ENABLE_IF(is_string<T>::value && !std::is_pointer<T>::value &&
+ std::is_same<char_type, char_t<T>>::value)>
+ FMT_CONSTEXPR FMT_INLINE auto map(const T& val)
+ -> basic_string_view<char_type> {
+ return to_string_view(val);
+ }
+ template <typename T,
+ FMT_ENABLE_IF(is_string<T>::value && !std::is_pointer<T>::value &&
+ !std::is_same<char_type, char_t<T>>::value)>
+ FMT_CONSTEXPR FMT_INLINE auto map(const T&) -> unformattable_char {
+ return {};
+ }
+
+ FMT_CONSTEXPR FMT_INLINE auto map(void* val) -> const void* { return val; }
+ FMT_CONSTEXPR FMT_INLINE auto map(const void* val) -> const void* {
+ return val;
+ }
+ FMT_CONSTEXPR FMT_INLINE auto map(std::nullptr_t val) -> const void* {
+ return val;
+ }
+
+ // Use SFINAE instead of a const T* parameter to avoid a conflict with the
+ // array overload.
+ template <
+ typename T,
+ FMT_ENABLE_IF(
+ std::is_pointer<T>::value || std::is_member_pointer<T>::value ||
+ std::is_function<typename std::remove_pointer<T>::type>::value ||
+ (std::is_array<T>::value &&
+ !std::is_convertible<T, const char_type*>::value))>
+ FMT_CONSTEXPR auto map(const T&) -> unformattable_pointer {
+ return {};
+ }
+
+ template <typename T, std::size_t N,
+ FMT_ENABLE_IF(!std::is_same<T, wchar_t>::value)>
+ FMT_CONSTEXPR FMT_INLINE auto map(const T (&values)[N]) -> const T (&)[N] {
+ return values;
+ }
+
+ // Only map owning types because mapping views can be unsafe.
+ template <typename T, typename U = format_as_t<T>,
+ FMT_ENABLE_IF(std::is_arithmetic<U>::value)>
+ FMT_CONSTEXPR FMT_INLINE auto map(const T& val)
+ -> decltype(FMT_DECLTYPE_THIS map(U())) {
+ return map(format_as(val));
+ }
+
+ template <typename T, typename U = remove_const_t<T>>
+ struct formattable : bool_constant<has_const_formatter<U, Context>() ||
+ (has_formatter<U, Context>::value &&
+ !std::is_const<T>::value)> {};
+
+ template <typename T, FMT_ENABLE_IF(formattable<T>::value)>
+ FMT_CONSTEXPR FMT_INLINE auto do_map(T& val) -> T& {
+ return val;
+ }
+ template <typename T, FMT_ENABLE_IF(!formattable<T>::value)>
+ FMT_CONSTEXPR FMT_INLINE auto do_map(T&) -> unformattable {
+ return {};
+ }
+
+ template <typename T, typename U = remove_const_t<T>,
+ FMT_ENABLE_IF((std::is_class<U>::value || std::is_enum<U>::value ||
+ std::is_union<U>::value) &&
+ !is_string<U>::value && !is_char<U>::value &&
+ !is_named_arg<U>::value &&
+ !std::is_arithmetic<format_as_t<U>>::value)>
+ FMT_CONSTEXPR FMT_INLINE auto map(T& val)
+ -> decltype(FMT_DECLTYPE_THIS do_map(val)) {
+ return do_map(val);
+ }
+
+ template <typename T, FMT_ENABLE_IF(is_named_arg<T>::value)>
+ FMT_CONSTEXPR FMT_INLINE auto map(const T& named_arg)
+ -> decltype(FMT_DECLTYPE_THIS map(named_arg.value)) {
+ return map(named_arg.value);
+ }
+
+ auto map(...) -> unformattable { return {}; }
+};
+
+// A type constant after applying arg_mapper<Context>.
+template <typename T, typename Context>
+using mapped_type_constant =
+ type_constant<decltype(arg_mapper<Context>().map(std::declval<const T&>())),
+ typename Context::char_type>;
+
+enum { packed_arg_bits = 4 };
+// Maximum number of arguments with packed types.
+enum { max_packed_args = 62 / packed_arg_bits };
+enum : unsigned long long { is_unpacked_bit = 1ULL << 63 };
+enum : unsigned long long { has_named_args_bit = 1ULL << 62 };
+
+template <typename Char, typename InputIt>
+auto copy_str(InputIt begin, InputIt end, appender out) -> appender {
+ get_container(out).append(begin, end);
+ return out;
+}
+template <typename Char, typename InputIt>
+auto copy_str(InputIt begin, InputIt end,
+ std::back_insert_iterator<std::string> out)
+ -> std::back_insert_iterator<std::string> {
+ get_container(out).append(begin, end);
+ return out;
+}
+
+template <typename Char, typename R, typename OutputIt>
+FMT_CONSTEXPR auto copy_str(R&& rng, OutputIt out) -> OutputIt {
+ return detail::copy_str<Char>(rng.begin(), rng.end(), out);
+}
+
+#if FMT_GCC_VERSION && FMT_GCC_VERSION < 500
+// A workaround for gcc 4.8 to make void_t work in a SFINAE context.
+template <typename...> struct void_t_impl {
+ using type = void;
+};
+template <typename... T> using void_t = typename void_t_impl<T...>::type;
+#else
+template <typename...> using void_t = void;
+#endif
+
+template <typename It, typename T, typename Enable = void>
+struct is_output_iterator : std::false_type {};
+
+template <typename It, typename T>
+struct is_output_iterator<
+ It, T,
+ void_t<typename std::iterator_traits<It>::iterator_category,
+ decltype(*std::declval<It>() = std::declval<T>())>>
+ : std::true_type {};
+
+template <typename It> struct is_back_insert_iterator : std::false_type {};
+template <typename Container>
+struct is_back_insert_iterator<std::back_insert_iterator<Container>>
+ : std::true_type {};
+
+// A type-erased reference to an std::locale to avoid a heavy <locale> include.
+class locale_ref {
+ private:
+ const void* locale_; // A type-erased pointer to std::locale.
+
+ public:
+ constexpr FMT_INLINE locale_ref() : locale_(nullptr) {}
+ template <typename Locale> explicit locale_ref(const Locale& loc);
+
+ explicit operator bool() const noexcept { return locale_ != nullptr; }
+
+ template <typename Locale> auto get() const -> Locale;
+};
+
+template <typename> constexpr auto encode_types() -> unsigned long long {
+ return 0;
+}
+
+template <typename Context, typename Arg, typename... Args>
+constexpr auto encode_types() -> unsigned long long {
+ return static_cast<unsigned>(mapped_type_constant<Arg, Context>::value) |
+ (encode_types<Context, Args...>() << packed_arg_bits);
+}
+
+#if defined(__cpp_if_constexpr)
+// This type is intentionally undefined, only used for errors
+template <typename T, typename Char> struct type_is_unformattable_for;
+#endif
+
+template <bool PACKED, typename Context, typename T, FMT_ENABLE_IF(PACKED)>
+FMT_CONSTEXPR FMT_INLINE auto make_arg(T& val) -> value<Context> {
+ using arg_type = remove_cvref_t<decltype(arg_mapper<Context>().map(val))>;
+
+ constexpr bool formattable_char =
+ !std::is_same<arg_type, unformattable_char>::value;
+ static_assert(formattable_char, "Mixing character types is disallowed.");
+
+ // Formatting of arbitrary pointers is disallowed. If you want to format a
+ // pointer cast it to `void*` or `const void*`. In particular, this forbids
+ // formatting of `[const] volatile char*` printed as bool by iostreams.
+ constexpr bool formattable_pointer =
+ !std::is_same<arg_type, unformattable_pointer>::value;
+ static_assert(formattable_pointer,
+ "Formatting of non-void pointers is disallowed.");
+
+ constexpr bool formattable = !std::is_same<arg_type, unformattable>::value;
+#if defined(__cpp_if_constexpr)
+ if constexpr (!formattable) {
+ type_is_unformattable_for<T, typename Context::char_type> _;
+ }
+#endif
+ static_assert(
+ formattable,
+ "Cannot format an argument. To make type T formattable provide a "
+ "formatter<T> specialization: https://fmt.dev/latest/api.html#udt");
+ return {arg_mapper<Context>().map(val)};
+}
+
+template <typename Context, typename T>
+FMT_CONSTEXPR auto make_arg(T& val) -> basic_format_arg<Context> {
+ auto arg = basic_format_arg<Context>();
+ arg.type_ = mapped_type_constant<T, Context>::value;
+ arg.value_ = make_arg<true, Context>(val);
+ return arg;
+}
+
+template <bool PACKED, typename Context, typename T, FMT_ENABLE_IF(!PACKED)>
+FMT_CONSTEXPR inline auto make_arg(T& val) -> basic_format_arg<Context> {
+ return make_arg<Context>(val);
+}
+} // namespace detail
+FMT_BEGIN_EXPORT
+
+// A formatting argument. Context is a template parameter for the compiled API
+// where output can be unbuffered.
+template <typename Context> class basic_format_arg {
+ private:
+ detail::value<Context> value_;
+ detail::type type_;
+
+ template <typename ContextType, typename T>
+ friend FMT_CONSTEXPR auto detail::make_arg(T& value)
+ -> basic_format_arg<ContextType>;
+
+ template <typename Visitor, typename Ctx>
+ friend FMT_CONSTEXPR auto visit_format_arg(Visitor&& vis,
+ const basic_format_arg<Ctx>& arg)
+ -> decltype(vis(0));
+
+ friend class basic_format_args<Context>;
+ friend class dynamic_format_arg_store<Context>;
+
+ using char_type = typename Context::char_type;
+
+ template <typename T, typename Char, size_t NUM_ARGS, size_t NUM_NAMED_ARGS>
+ friend struct detail::arg_data;
+
+ basic_format_arg(const detail::named_arg_info<char_type>* args, size_t size)
+ : value_(args, size) {}
+
+ public:
+ class handle {
+ public:
+ explicit handle(detail::custom_value<Context> custom) : custom_(custom) {}
+
+ void format(typename Context::parse_context_type& parse_ctx,
+ Context& ctx) const {
+ custom_.format(custom_.value, parse_ctx, ctx);
+ }
+
+ private:
+ detail::custom_value<Context> custom_;
+ };
+
+ constexpr basic_format_arg() : type_(detail::type::none_type) {}
+
+ constexpr explicit operator bool() const noexcept {
+ return type_ != detail::type::none_type;
+ }
+
+ auto type() const -> detail::type { return type_; }
+
+ auto is_integral() const -> bool { return detail::is_integral_type(type_); }
+ auto is_arithmetic() const -> bool {
+ return detail::is_arithmetic_type(type_);
+ }
+
+ FMT_INLINE auto format_custom(const char_type* parse_begin,
+ typename Context::parse_context_type& parse_ctx,
+ Context& ctx) -> bool {
+ if (type_ != detail::type::custom_type) return false;
+ parse_ctx.advance_to(parse_begin);
+ value_.custom.format(value_.custom.value, parse_ctx, ctx);
+ return true;
+ }
+};
+
+/**
+ \rst
+ Visits an argument dispatching to the appropriate visit method based on
+ the argument type. For example, if the argument type is ``double`` then
+ ``vis(value)`` will be called with the value of type ``double``.
+ \endrst
+ */
+// DEPRECATED!
+template <typename Visitor, typename Context>
+FMT_CONSTEXPR FMT_INLINE auto visit_format_arg(
+ Visitor&& vis, const basic_format_arg<Context>& arg) -> decltype(vis(0)) {
+ switch (arg.type_) {
+ case detail::type::none_type:
+ break;
+ case detail::type::int_type:
+ return vis(arg.value_.int_value);
+ case detail::type::uint_type:
+ return vis(arg.value_.uint_value);
+ case detail::type::long_long_type:
+ return vis(arg.value_.long_long_value);
+ case detail::type::ulong_long_type:
+ return vis(arg.value_.ulong_long_value);
+ case detail::type::int128_type:
+ return vis(detail::convert_for_visit(arg.value_.int128_value));
+ case detail::type::uint128_type:
+ return vis(detail::convert_for_visit(arg.value_.uint128_value));
+ case detail::type::bool_type:
+ return vis(arg.value_.bool_value);
+ case detail::type::char_type:
+ return vis(arg.value_.char_value);
+ case detail::type::float_type:
+ return vis(arg.value_.float_value);
+ case detail::type::double_type:
+ return vis(arg.value_.double_value);
+ case detail::type::long_double_type:
+ return vis(arg.value_.long_double_value);
+ case detail::type::cstring_type:
+ return vis(arg.value_.string.data);
+ case detail::type::string_type:
+ using sv = basic_string_view<typename Context::char_type>;
+ return vis(sv(arg.value_.string.data, arg.value_.string.size));
+ case detail::type::pointer_type:
+ return vis(arg.value_.pointer);
+ case detail::type::custom_type:
+ return vis(typename basic_format_arg<Context>::handle(arg.value_.custom));
+ }
+ return vis(monostate());
+}
+
+// Formatting context.
+template <typename OutputIt, typename Char> class basic_format_context {
+ private:
+ OutputIt out_;
+ basic_format_args<basic_format_context> args_;
+ detail::locale_ref loc_;
+
+ public:
+ using iterator = OutputIt;
+ using format_arg = basic_format_arg<basic_format_context>;
+ using format_args = basic_format_args<basic_format_context>;
+ using parse_context_type = basic_format_parse_context<Char>;
+ template <typename T> using formatter_type = formatter<T, Char>;
+
+ /** The character type for the output. */
+ using char_type = Char;
+
+ basic_format_context(basic_format_context&&) = default;
+ basic_format_context(const basic_format_context&) = delete;
+ void operator=(const basic_format_context&) = delete;
+ /**
+ Constructs a ``basic_format_context`` object. References to the arguments
+ are stored in the object so make sure they have appropriate lifetimes.
+ */
+ constexpr basic_format_context(OutputIt out, format_args ctx_args,
+ detail::locale_ref loc = {})
+ : out_(out), args_(ctx_args), loc_(loc) {}
+
+ constexpr auto arg(int id) const -> format_arg { return args_.get(id); }
+ FMT_CONSTEXPR auto arg(basic_string_view<Char> name) -> format_arg {
+ return args_.get(name);
+ }
+ FMT_CONSTEXPR auto arg_id(basic_string_view<Char> name) -> int {
+ return args_.get_id(name);
+ }
+ auto args() const -> const format_args& { return args_; }
+
+ // DEPRECATED!
+ FMT_CONSTEXPR auto error_handler() -> detail::error_handler { return {}; }
+ void on_error(const char* message) { error_handler().on_error(message); }
+
+ // Returns an iterator to the beginning of the output range.
+ FMT_CONSTEXPR auto out() -> iterator { return out_; }
+
+ // Advances the begin iterator to ``it``.
+ void advance_to(iterator it) {
+ if (!detail::is_back_insert_iterator<iterator>()) out_ = it;
+ }
+
+ FMT_CONSTEXPR auto locale() -> detail::locale_ref { return loc_; }
+};
+
+template <typename Char>
+using buffer_context =
+ basic_format_context<detail::buffer_appender<Char>, Char>;
+using format_context = buffer_context<char>;
+
+template <typename T, typename Char = char>
+using is_formattable = bool_constant<!std::is_base_of<
+ detail::unformattable, decltype(detail::arg_mapper<buffer_context<Char>>()
+ .map(std::declval<T&>()))>::value>;
+
+/**
+ \rst
+ An array of references to arguments. It can be implicitly converted into
+ `~fmt::basic_format_args` for passing into type-erased formatting functions
+ such as `~fmt::vformat`.
+ \endrst
+ */
+template <typename Context, typename... Args>
+class format_arg_store
+#if FMT_GCC_VERSION && FMT_GCC_VERSION < 409
+ // Workaround a GCC template argument substitution bug.
+ : public basic_format_args<Context>
+#endif
+{
+ private:
+ static const size_t num_args = sizeof...(Args);
+ static constexpr size_t num_named_args = detail::count_named_args<Args...>();
+ static const bool is_packed = num_args <= detail::max_packed_args;
+
+ using value_type = conditional_t<is_packed, detail::value<Context>,
+ basic_format_arg<Context>>;
+
+ detail::arg_data<value_type, typename Context::char_type, num_args,
+ num_named_args>
+ data_;
+
+ friend class basic_format_args<Context>;
+
+ static constexpr unsigned long long desc =
+ (is_packed ? detail::encode_types<Context, Args...>()
+ : detail::is_unpacked_bit | num_args) |
+ (num_named_args != 0
+ ? static_cast<unsigned long long>(detail::has_named_args_bit)
+ : 0);
+
+ public:
+ template <typename... T>
+ FMT_CONSTEXPR FMT_INLINE format_arg_store(T&... args)
+ :
+#if FMT_GCC_VERSION && FMT_GCC_VERSION < 409
+ basic_format_args<Context>(*this),
+#endif
+ data_{detail::make_arg<is_packed, Context>(args)...} {
+ if (detail::const_check(num_named_args != 0))
+ detail::init_named_args(data_.named_args(), 0, 0, args...);
+ }
+};
+
+/**
+ \rst
+ Constructs a `~fmt::format_arg_store` object that contains references to
+ arguments and can be implicitly converted to `~fmt::format_args`. `Context`
+ can be omitted in which case it defaults to `~fmt::format_context`.
+ See `~fmt::arg` for lifetime considerations.
+ \endrst
+ */
+// Arguments are taken by lvalue references to avoid some lifetime issues.
+template <typename Context = format_context, typename... T>
+constexpr auto make_format_args(T&... args)
+ -> format_arg_store<Context, remove_cvref_t<T>...> {
+ return {args...};
+}
+
+/**
+ \rst
+ Returns a named argument to be used in a formatting function.
+ It should only be used in a call to a formatting function or
+ `dynamic_format_arg_store::push_back`.
+
+ **Example**::
+
+ fmt::print("Elapsed time: {s:.2f} seconds", fmt::arg("s", 1.23));
+ \endrst
+ */
+template <typename Char, typename T>
+inline auto arg(const Char* name, const T& arg) -> detail::named_arg<Char, T> {
+ static_assert(!detail::is_named_arg<T>(), "nested named arguments");
+ return {name, arg};
+}
+FMT_END_EXPORT
+
+/**
+ \rst
+ A view of a collection of formatting arguments. To avoid lifetime issues it
+ should only be used as a parameter type in type-erased functions such as
+ ``vformat``::
+
+ void vlog(string_view format_str, format_args args); // OK
+ format_args args = make_format_args(); // Error: dangling reference
+ \endrst
+ */
+template <typename Context> class basic_format_args {
+ public:
+ using size_type = int;
+ using format_arg = basic_format_arg<Context>;
+
+ private:
+ // A descriptor that contains information about formatting arguments.
+ // If the number of arguments is less or equal to max_packed_args then
+ // argument types are passed in the descriptor. This reduces binary code size
+ // per formatting function call.
+ unsigned long long desc_;
+ union {
+ // If is_packed() returns true then argument values are stored in values_;
+ // otherwise they are stored in args_. This is done to improve cache
+ // locality and reduce compiled code size since storing larger objects
+ // may require more code (at least on x86-64) even if the same amount of
+ // data is actually copied to stack. It saves ~10% on the bloat test.
+ const detail::value<Context>* values_;
+ const format_arg* args_;
+ };
+
+ constexpr auto is_packed() const -> bool {
+ return (desc_ & detail::is_unpacked_bit) == 0;
+ }
+ auto has_named_args() const -> bool {
+ return (desc_ & detail::has_named_args_bit) != 0;
+ }
+
+ FMT_CONSTEXPR auto type(int index) const -> detail::type {
+ int shift = index * detail::packed_arg_bits;
+ unsigned int mask = (1 << detail::packed_arg_bits) - 1;
+ return static_cast<detail::type>((desc_ >> shift) & mask);
+ }
+
+ constexpr FMT_INLINE basic_format_args(unsigned long long desc,
+ const detail::value<Context>* values)
+ : desc_(desc), values_(values) {}
+ constexpr basic_format_args(unsigned long long desc, const format_arg* args)
+ : desc_(desc), args_(args) {}
+
+ public:
+ constexpr basic_format_args() : desc_(0), args_(nullptr) {}
+
+ /**
+ \rst
+ Constructs a `basic_format_args` object from `~fmt::format_arg_store`.
+ \endrst
+ */
+ template <typename... Args>
+ constexpr FMT_INLINE basic_format_args(
+ const format_arg_store<Context, Args...>& store)
+ : basic_format_args(format_arg_store<Context, Args...>::desc,
+ store.data_.args()) {}
+
+ /**
+ \rst
+ Constructs a `basic_format_args` object from
+ `~fmt::dynamic_format_arg_store`.
+ \endrst
+ */
+ constexpr FMT_INLINE basic_format_args(
+ const dynamic_format_arg_store<Context>& store)
+ : basic_format_args(store.get_types(), store.data()) {}
+
+ /**
+ \rst
+ Constructs a `basic_format_args` object from a dynamic set of arguments.
+ \endrst
+ */
+ constexpr basic_format_args(const format_arg* args, int count)
+ : basic_format_args(detail::is_unpacked_bit | detail::to_unsigned(count),
+ args) {}
+
+ /** Returns the argument with the specified id. */
+ FMT_CONSTEXPR auto get(int id) const -> format_arg {
+ format_arg arg;
+ if (!is_packed()) {
+ if (id < max_size()) arg = args_[id];
+ return arg;
+ }
+ if (id >= detail::max_packed_args) return arg;
+ arg.type_ = type(id);
+ if (arg.type_ == detail::type::none_type) return arg;
+ arg.value_ = values_[id];
+ return arg;
+ }
+
+ template <typename Char>
+ auto get(basic_string_view<Char> name) const -> format_arg {
+ int id = get_id(name);
+ return id >= 0 ? get(id) : format_arg();
+ }
+
+ template <typename Char>
+ auto get_id(basic_string_view<Char> name) const -> int {
+ if (!has_named_args()) return -1;
+ const auto& named_args =
+ (is_packed() ? values_[-1] : args_[-1].value_).named_args;
+ for (size_t i = 0; i < named_args.size; ++i) {
+ if (named_args.data[i].name == name) return named_args.data[i].id;
+ }
+ return -1;
+ }
+
+ auto max_size() const -> int {
+ unsigned long long max_packed = detail::max_packed_args;
+ return static_cast<int>(is_packed() ? max_packed
+ : desc_ & ~detail::is_unpacked_bit);
+ }
+};
+
+/** An alias to ``basic_format_args<format_context>``. */
+// A separate type would result in shorter symbols but break ABI compatibility
+// between clang and gcc on ARM (#1919).
+FMT_EXPORT using format_args = basic_format_args<format_context>;
+
+// We cannot use enum classes as bit fields because of a gcc bug, so we put them
+// in namespaces instead (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61414).
+// Additionally, if an underlying type is specified, older gcc incorrectly warns
+// that the type is too small. Both bugs are fixed in gcc 9.3.
+#if FMT_GCC_VERSION && FMT_GCC_VERSION < 903
+# define FMT_ENUM_UNDERLYING_TYPE(type)
+#else
+# define FMT_ENUM_UNDERLYING_TYPE(type) : type
+#endif
+namespace align {
+enum type FMT_ENUM_UNDERLYING_TYPE(unsigned char){none, left, right, center,
+ numeric};
+}
+using align_t = align::type;
+namespace sign {
+enum type FMT_ENUM_UNDERLYING_TYPE(unsigned char){none, minus, plus, space};
+}
+using sign_t = sign::type;
+
+namespace detail {
+
+// Workaround an array initialization issue in gcc 4.8.
+template <typename Char> struct fill_t {
+ private:
+ enum { max_size = 4 };
+ Char data_[max_size] = {Char(' '), Char(0), Char(0), Char(0)};
+ unsigned char size_ = 1;
+
+ public:
+ FMT_CONSTEXPR void operator=(basic_string_view<Char> s) {
+ auto size = s.size();
+ FMT_ASSERT(size <= max_size, "invalid fill");
+ for (size_t i = 0; i < size; ++i) data_[i] = s[i];
+ size_ = static_cast<unsigned char>(size);
+ }
+
+ constexpr auto size() const -> size_t { return size_; }
+ constexpr auto data() const -> const Char* { return data_; }
+
+ FMT_CONSTEXPR auto operator[](size_t index) -> Char& { return data_[index]; }
+ FMT_CONSTEXPR auto operator[](size_t index) const -> const Char& {
+ return data_[index];
+ }
+};
+} // namespace detail
+
+enum class presentation_type : unsigned char {
+ none,
+ dec, // 'd'
+ oct, // 'o'
+ hex_lower, // 'x'
+ hex_upper, // 'X'
+ bin_lower, // 'b'
+ bin_upper, // 'B'
+ hexfloat_lower, // 'a'
+ hexfloat_upper, // 'A'
+ exp_lower, // 'e'
+ exp_upper, // 'E'
+ fixed_lower, // 'f'
+ fixed_upper, // 'F'
+ general_lower, // 'g'
+ general_upper, // 'G'
+ chr, // 'c'
+ string, // 's'
+ pointer, // 'p'
+ debug // '?'
+};
+
+// Format specifiers for built-in and string types.
+template <typename Char = char> struct format_specs {
+ int width;
+ int precision;
+ presentation_type type;
+ align_t align : 4;
+ sign_t sign : 3;
+ bool alt : 1; // Alternate form ('#').
+ bool localized : 1;
+ detail::fill_t<Char> fill;
+
+ constexpr format_specs()
+ : width(0),
+ precision(-1),
+ type(presentation_type::none),
+ align(align::none),
+ sign(sign::none),
+ alt(false),
+ localized(false) {}
+};
+
+namespace detail {
+
+enum class arg_id_kind { none, index, name };
+
+// An argument reference.
+template <typename Char> struct arg_ref {
+ FMT_CONSTEXPR arg_ref() : kind(arg_id_kind::none), val() {}
+
+ FMT_CONSTEXPR explicit arg_ref(int index)
+ : kind(arg_id_kind::index), val(index) {}
+ FMT_CONSTEXPR explicit arg_ref(basic_string_view<Char> name)
+ : kind(arg_id_kind::name), val(name) {}
+
+ FMT_CONSTEXPR auto operator=(int idx) -> arg_ref& {
+ kind = arg_id_kind::index;
+ val.index = idx;
+ return *this;
+ }
+
+ arg_id_kind kind;
+ union value {
+ FMT_CONSTEXPR value(int idx = 0) : index(idx) {}
+ FMT_CONSTEXPR value(basic_string_view<Char> n) : name(n) {}
+
+ int index;
+ basic_string_view<Char> name;
+ } val;
+};
+
+// Format specifiers with width and precision resolved at formatting rather
+// than parsing time to allow reusing the same parsed specifiers with
+// different sets of arguments (precompilation of format strings).
+template <typename Char = char>
+struct dynamic_format_specs : format_specs<Char> {
+ arg_ref<Char> width_ref;
+ arg_ref<Char> precision_ref;
+};
+
+// Converts a character to ASCII. Returns '\0' on conversion failure.
+template <typename Char, FMT_ENABLE_IF(std::is_integral<Char>::value)>
+constexpr auto to_ascii(Char c) -> char {
+ return c <= 0xff ? static_cast<char>(c) : '\0';
+}
+template <typename Char, FMT_ENABLE_IF(std::is_enum<Char>::value)>
+constexpr auto to_ascii(Char c) -> char {
+ return c <= 0xff ? static_cast<char>(c) : '\0';
+}
+
+// Returns the number of code units in a code point or 1 on error.
+template <typename Char>
+FMT_CONSTEXPR auto code_point_length(const Char* begin) -> int {
+ if (const_check(sizeof(Char) != 1)) return 1;
+ auto c = static_cast<unsigned char>(*begin);
+ return static_cast<int>((0x3a55000000000000ull >> (2 * (c >> 3))) & 0x3) + 1;
+}
+
+// Return the result via the out param to workaround gcc bug 77539.
+template <bool IS_CONSTEXPR, typename T, typename Ptr = const T*>
+FMT_CONSTEXPR auto find(Ptr first, Ptr last, T value, Ptr& out) -> bool {
+ for (out = first; out != last; ++out) {
+ if (*out == value) return true;
+ }
+ return false;
+}
+
+template <>
+inline auto find<false, char>(const char* first, const char* last, char value,
+ const char*& out) -> bool {
+ out = static_cast<const char*>(
+ std::memchr(first, value, to_unsigned(last - first)));
+ return out != nullptr;
+}
+
+// Parses the range [begin, end) as an unsigned integer. This function assumes
+// that the range is non-empty and the first character is a digit.
+template <typename Char>
+FMT_CONSTEXPR auto parse_nonnegative_int(const Char*& begin, const Char* end,
+ int error_value) noexcept -> int {
+ FMT_ASSERT(begin != end && '0' <= *begin && *begin <= '9', "");
+ unsigned value = 0, prev = 0;
+ auto p = begin;
+ do {
+ prev = value;
+ value = value * 10 + unsigned(*p - '0');
+ ++p;
+ } while (p != end && '0' <= *p && *p <= '9');
+ auto num_digits = p - begin;
+ begin = p;
+ if (num_digits <= std::numeric_limits<int>::digits10)
+ return static_cast<int>(value);
+ // Check for overflow.
+ const unsigned max = to_unsigned((std::numeric_limits<int>::max)());
+ return num_digits == std::numeric_limits<int>::digits10 + 1 &&
+ prev * 10ull + unsigned(p[-1] - '0') <= max
+ ? static_cast<int>(value)
+ : error_value;
+}
+
+FMT_CONSTEXPR inline auto parse_align(char c) -> align_t {
+ switch (c) {
+ case '<':
+ return align::left;
+ case '>':
+ return align::right;
+ case '^':
+ return align::center;
+ }
+ return align::none;
+}
+
+template <typename Char> constexpr auto is_name_start(Char c) -> bool {
+ return ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z') || c == '_';
+}
+
+template <typename Char, typename Handler>
+FMT_CONSTEXPR auto do_parse_arg_id(const Char* begin, const Char* end,
+ Handler&& handler) -> const Char* {
+ Char c = *begin;
+ if (c >= '0' && c <= '9') {
+ int index = 0;
+ constexpr int max = (std::numeric_limits<int>::max)();
+ if (c != '0')
+ index = parse_nonnegative_int(begin, end, max);
+ else
+ ++begin;
+ if (begin == end || (*begin != '}' && *begin != ':'))
+ throw_format_error("invalid format string");
+ else
+ handler.on_index(index);
+ return begin;
+ }
+ if (!is_name_start(c)) {
+ throw_format_error("invalid format string");
+ return begin;
+ }
+ auto it = begin;
+ do {
+ ++it;
+ } while (it != end && (is_name_start(*it) || ('0' <= *it && *it <= '9')));
+ handler.on_name({begin, to_unsigned(it - begin)});
+ return it;
+}
+
+template <typename Char, typename Handler>
+FMT_CONSTEXPR FMT_INLINE auto parse_arg_id(const Char* begin, const Char* end,
+ Handler&& handler) -> const Char* {
+ FMT_ASSERT(begin != end, "");
+ Char c = *begin;
+ if (c != '}' && c != ':') return do_parse_arg_id(begin, end, handler);
+ handler.on_auto();
+ return begin;
+}
+
+template <typename Char> struct dynamic_spec_id_handler {
+ basic_format_parse_context<Char>& ctx;
+ arg_ref<Char>& ref;
+
+ FMT_CONSTEXPR void on_auto() {
+ int id = ctx.next_arg_id();
+ ref = arg_ref<Char>(id);
+ ctx.check_dynamic_spec(id);
+ }
+ FMT_CONSTEXPR void on_index(int id) {
+ ref = arg_ref<Char>(id);
+ ctx.check_arg_id(id);
+ ctx.check_dynamic_spec(id);
+ }
+ FMT_CONSTEXPR void on_name(basic_string_view<Char> id) {
+ ref = arg_ref<Char>(id);
+ ctx.check_arg_id(id);
+ }
+};
+
+// Parses [integer | "{" [arg_id] "}"].
+template <typename Char>
+FMT_CONSTEXPR auto parse_dynamic_spec(const Char* begin, const Char* end,
+ int& value, arg_ref<Char>& ref,
+ basic_format_parse_context<Char>& ctx)
+ -> const Char* {
+ FMT_ASSERT(begin != end, "");
+ if ('0' <= *begin && *begin <= '9') {
+ int val = parse_nonnegative_int(begin, end, -1);
+ if (val != -1)
+ value = val;
+ else
+ throw_format_error("number is too big");
+ } else if (*begin == '{') {
+ ++begin;
+ auto handler = dynamic_spec_id_handler<Char>{ctx, ref};
+ if (begin != end) begin = parse_arg_id(begin, end, handler);
+ if (begin != end && *begin == '}') return ++begin;
+ throw_format_error("invalid format string");
+ }
+ return begin;
+}
+
+template <typename Char>
+FMT_CONSTEXPR auto parse_precision(const Char* begin, const Char* end,
+ int& value, arg_ref<Char>& ref,
+ basic_format_parse_context<Char>& ctx)
+ -> const Char* {
+ ++begin;
+ if (begin == end || *begin == '}') {
+ throw_format_error("invalid precision");
+ return begin;
+ }
+ return parse_dynamic_spec(begin, end, value, ref, ctx);
+}
+
+enum class state { start, align, sign, hash, zero, width, precision, locale };
+
+// Parses standard format specifiers.
+template <typename Char>
+FMT_CONSTEXPR FMT_INLINE auto parse_format_specs(
+ const Char* begin, const Char* end, dynamic_format_specs<Char>& specs,
+ basic_format_parse_context<Char>& ctx, type arg_type) -> const Char* {
+ auto c = '\0';
+ if (end - begin > 1) {
+ auto next = to_ascii(begin[1]);
+ c = parse_align(next) == align::none ? to_ascii(*begin) : '\0';
+ } else {
+ if (begin == end) return begin;
+ c = to_ascii(*begin);
+ }
+
+ struct {
+ state current_state = state::start;
+ FMT_CONSTEXPR void operator()(state s, bool valid = true) {
+ if (current_state >= s || !valid)
+ throw_format_error("invalid format specifier");
+ current_state = s;
+ }
+ } enter_state;
+
+ using pres = presentation_type;
+ constexpr auto integral_set = sint_set | uint_set | bool_set | char_set;
+ struct {
+ const Char*& begin;
+ dynamic_format_specs<Char>& specs;
+ type arg_type;
+
+ FMT_CONSTEXPR auto operator()(pres pres_type, int set) -> const Char* {
+ if (!in(arg_type, set)) {
+ if (arg_type == type::none_type) return begin;
+ throw_format_error("invalid format specifier");
+ }
+ specs.type = pres_type;
+ return begin + 1;
+ }
+ } parse_presentation_type{begin, specs, arg_type};
+
+ for (;;) {
+ switch (c) {
+ case '<':
+ case '>':
+ case '^':
+ enter_state(state::align);
+ specs.align = parse_align(c);
+ ++begin;
+ break;
+ case '+':
+ case '-':
+ case ' ':
+ if (arg_type == type::none_type) return begin;
+ enter_state(state::sign, in(arg_type, sint_set | float_set));
+ switch (c) {
+ case '+':
+ specs.sign = sign::plus;
+ break;
+ case '-':
+ specs.sign = sign::minus;
+ break;
+ case ' ':
+ specs.sign = sign::space;
+ break;
+ }
+ ++begin;
+ break;
+ case '#':
+ if (arg_type == type::none_type) return begin;
+ enter_state(state::hash, is_arithmetic_type(arg_type));
+ specs.alt = true;
+ ++begin;
+ break;
+ case '0':
+ enter_state(state::zero);
+ if (!is_arithmetic_type(arg_type)) {
+ if (arg_type == type::none_type) return begin;
+ throw_format_error("format specifier requires numeric argument");
+ }
+ if (specs.align == align::none) {
+ // Ignore 0 if align is specified for compatibility with std::format.
+ specs.align = align::numeric;
+ specs.fill[0] = Char('0');
+ }
+ ++begin;
+ break;
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ case '5':
+ case '6':
+ case '7':
+ case '8':
+ case '9':
+ case '{':
+ enter_state(state::width);
+ begin = parse_dynamic_spec(begin, end, specs.width, specs.width_ref, ctx);
+ break;
+ case '.':
+ if (arg_type == type::none_type) return begin;
+ enter_state(state::precision,
+ in(arg_type, float_set | string_set | cstring_set));
+ begin = parse_precision(begin, end, specs.precision, specs.precision_ref,
+ ctx);
+ break;
+ case 'L':
+ if (arg_type == type::none_type) return begin;
+ enter_state(state::locale, is_arithmetic_type(arg_type));
+ specs.localized = true;
+ ++begin;
+ break;
+ case 'd':
+ return parse_presentation_type(pres::dec, integral_set);
+ case 'o':
+ return parse_presentation_type(pres::oct, integral_set);
+ case 'x':
+ return parse_presentation_type(pres::hex_lower, integral_set);
+ case 'X':
+ return parse_presentation_type(pres::hex_upper, integral_set);
+ case 'b':
+ return parse_presentation_type(pres::bin_lower, integral_set);
+ case 'B':
+ return parse_presentation_type(pres::bin_upper, integral_set);
+ case 'a':
+ return parse_presentation_type(pres::hexfloat_lower, float_set);
+ case 'A':
+ return parse_presentation_type(pres::hexfloat_upper, float_set);
+ case 'e':
+ return parse_presentation_type(pres::exp_lower, float_set);
+ case 'E':
+ return parse_presentation_type(pres::exp_upper, float_set);
+ case 'f':
+ return parse_presentation_type(pres::fixed_lower, float_set);
+ case 'F':
+ return parse_presentation_type(pres::fixed_upper, float_set);
+ case 'g':
+ return parse_presentation_type(pres::general_lower, float_set);
+ case 'G':
+ return parse_presentation_type(pres::general_upper, float_set);
+ case 'c':
+ if (arg_type == type::bool_type)
+ throw_format_error("invalid format specifier");
+ return parse_presentation_type(pres::chr, integral_set);
+ case 's':
+ return parse_presentation_type(pres::string,
+ bool_set | string_set | cstring_set);
+ case 'p':
+ return parse_presentation_type(pres::pointer, pointer_set | cstring_set);
+ case '?':
+ return parse_presentation_type(pres::debug,
+ char_set | string_set | cstring_set);
+ case '}':
+ return begin;
+ default: {
+ if (*begin == '}') return begin;
+ // Parse fill and alignment.
+ auto fill_end = begin + code_point_length(begin);
+ if (end - fill_end <= 0) {
+ throw_format_error("invalid format specifier");
+ return begin;
+ }
+ if (*begin == '{') {
+ throw_format_error("invalid fill character '{'");
+ return begin;
+ }
+ auto align = parse_align(to_ascii(*fill_end));
+ enter_state(state::align, align != align::none);
+ specs.fill = {begin, to_unsigned(fill_end - begin)};
+ specs.align = align;
+ begin = fill_end + 1;
+ }
+ }
+ if (begin == end) return begin;
+ c = to_ascii(*begin);
+ }
+}
+
+template <typename Char, typename Handler>
+FMT_CONSTEXPR auto parse_replacement_field(const Char* begin, const Char* end,
+ Handler&& handler) -> const Char* {
+ struct id_adapter {
+ Handler& handler;
+ int arg_id;
+
+ FMT_CONSTEXPR void on_auto() { arg_id = handler.on_arg_id(); }
+ FMT_CONSTEXPR void on_index(int id) { arg_id = handler.on_arg_id(id); }
+ FMT_CONSTEXPR void on_name(basic_string_view<Char> id) {
+ arg_id = handler.on_arg_id(id);
+ }
+ };
+
+ ++begin;
+ if (begin == end) return handler.on_error("invalid format string"), end;
+ if (*begin == '}') {
+ handler.on_replacement_field(handler.on_arg_id(), begin);
+ } else if (*begin == '{') {
+ handler.on_text(begin, begin + 1);
+ } else {
+ auto adapter = id_adapter{handler, 0};
+ begin = parse_arg_id(begin, end, adapter);
+ Char c = begin != end ? *begin : Char();
+ if (c == '}') {
+ handler.on_replacement_field(adapter.arg_id, begin);
+ } else if (c == ':') {
+ begin = handler.on_format_specs(adapter.arg_id, begin + 1, end);
+ if (begin == end || *begin != '}')
+ return handler.on_error("unknown format specifier"), end;
+ } else {
+ return handler.on_error("missing '}' in format string"), end;
+ }
+ }
+ return begin + 1;
+}
+
+template <bool IS_CONSTEXPR, typename Char, typename Handler>
+FMT_CONSTEXPR FMT_INLINE void parse_format_string(
+ basic_string_view<Char> format_str, Handler&& handler) {
+ auto begin = format_str.data();
+ auto end = begin + format_str.size();
+ if (end - begin < 32) {
+ // Use a simple loop instead of memchr for small strings.
+ const Char* p = begin;
+ while (p != end) {
+ auto c = *p++;
+ if (c == '{') {
+ handler.on_text(begin, p - 1);
+ begin = p = parse_replacement_field(p - 1, end, handler);
+ } else if (c == '}') {
+ if (p == end || *p != '}')
+ return handler.on_error("unmatched '}' in format string");
+ handler.on_text(begin, p);
+ begin = ++p;
+ }
+ }
+ handler.on_text(begin, end);
+ return;
+ }
+ struct writer {
+ FMT_CONSTEXPR void operator()(const Char* from, const Char* to) {
+ if (from == to) return;
+ for (;;) {
+ const Char* p = nullptr;
+ if (!find<IS_CONSTEXPR>(from, to, Char('}'), p))
+ return handler_.on_text(from, to);
+ ++p;
+ if (p == to || *p != '}')
+ return handler_.on_error("unmatched '}' in format string");
+ handler_.on_text(from, p);
+ from = p + 1;
+ }
+ }
+ Handler& handler_;
+ } write = {handler};
+ while (begin != end) {
+ // Doing two passes with memchr (one for '{' and another for '}') is up to
+ // 2.5x faster than the naive one-pass implementation on big format strings.
+ const Char* p = begin;
+ if (*begin != '{' && !find<IS_CONSTEXPR>(begin + 1, end, Char('{'), p))
+ return write(begin, end);
+ write(begin, p);
+ begin = parse_replacement_field(p, end, handler);
+ }
+}
+
+template <typename T, bool = is_named_arg<T>::value> struct strip_named_arg {
+ using type = T;
+};
+template <typename T> struct strip_named_arg<T, true> {
+ using type = remove_cvref_t<decltype(T::value)>;
+};
+
+template <typename T, typename ParseContext>
+FMT_CONSTEXPR auto parse_format_specs(ParseContext& ctx)
+ -> decltype(ctx.begin()) {
+ using char_type = typename ParseContext::char_type;
+ using context = buffer_context<char_type>;
+ using mapped_type = conditional_t<
+ mapped_type_constant<T, context>::value != type::custom_type,
+ decltype(arg_mapper<context>().map(std::declval<const T&>())),
+ typename strip_named_arg<T>::type>;
+#if defined(__cpp_if_constexpr)
+ if constexpr (std::is_default_constructible<
+ formatter<mapped_type, char_type>>::value) {
+ return formatter<mapped_type, char_type>().parse(ctx);
+ } else {
+ type_is_unformattable_for<T, char_type> _;
+ return ctx.begin();
+ }
+#else
+ return formatter<mapped_type, char_type>().parse(ctx);
+#endif
+}
+
+// Checks char specs and returns true iff the presentation type is char-like.
+template <typename Char>
+FMT_CONSTEXPR auto check_char_specs(const format_specs<Char>& specs) -> bool {
+ if (specs.type != presentation_type::none &&
+ specs.type != presentation_type::chr &&
+ specs.type != presentation_type::debug) {
+ return false;
+ }
+ if (specs.align == align::numeric || specs.sign != sign::none || specs.alt)
+ throw_format_error("invalid format specifier for char");
+ return true;
+}
+
+#if FMT_USE_NONTYPE_TEMPLATE_ARGS
+template <int N, typename T, typename... Args, typename Char>
+constexpr auto get_arg_index_by_name(basic_string_view<Char> name) -> int {
+ if constexpr (is_statically_named_arg<T>()) {
+ if (name == T::name) return N;
+ }
+ if constexpr (sizeof...(Args) > 0)
+ return get_arg_index_by_name<N + 1, Args...>(name);
+ (void)name; // Workaround an MSVC bug about "unused" parameter.
+ return -1;
+}
+#endif
+
+template <typename... Args, typename Char>
+FMT_CONSTEXPR auto get_arg_index_by_name(basic_string_view<Char> name) -> int {
+#if FMT_USE_NONTYPE_TEMPLATE_ARGS
+ if constexpr (sizeof...(Args) > 0)
+ return get_arg_index_by_name<0, Args...>(name);
+#endif
+ (void)name;
+ return -1;
+}
+
+template <typename Char, typename... Args> class format_string_checker {
+ private:
+ using parse_context_type = compile_parse_context<Char>;
+ static constexpr int num_args = sizeof...(Args);
+
+ // Format specifier parsing function.
+ // In the future basic_format_parse_context will replace compile_parse_context
+ // here and will use is_constant_evaluated and downcasting to access the data
+ // needed for compile-time checks: https://godbolt.org/z/GvWzcTjh1.
+ using parse_func = const Char* (*)(parse_context_type&);
+
+ type types_[num_args > 0 ? static_cast<size_t>(num_args) : 1];
+ parse_context_type context_;
+ parse_func parse_funcs_[num_args > 0 ? static_cast<size_t>(num_args) : 1];
+
+ public:
+ explicit FMT_CONSTEXPR format_string_checker(basic_string_view<Char> fmt)
+ : types_{mapped_type_constant<Args, buffer_context<Char>>::value...},
+ context_(fmt, num_args, types_),
+ parse_funcs_{&parse_format_specs<Args, parse_context_type>...} {}
+
+ FMT_CONSTEXPR void on_text(const Char*, const Char*) {}
+
+ FMT_CONSTEXPR auto on_arg_id() -> int { return context_.next_arg_id(); }
+ FMT_CONSTEXPR auto on_arg_id(int id) -> int {
+ return context_.check_arg_id(id), id;
+ }
+ FMT_CONSTEXPR auto on_arg_id(basic_string_view<Char> id) -> int {
+#if FMT_USE_NONTYPE_TEMPLATE_ARGS
+ auto index = get_arg_index_by_name<Args...>(id);
+ if (index < 0) on_error("named argument is not found");
+ return index;
+#else
+ (void)id;
+ on_error("compile-time checks for named arguments require C++20 support");
+ return 0;
+#endif
+ }
+
+ FMT_CONSTEXPR void on_replacement_field(int id, const Char* begin) {
+ on_format_specs(id, begin, begin); // Call parse() on empty specs.
+ }
+
+ FMT_CONSTEXPR auto on_format_specs(int id, const Char* begin, const Char*)
+ -> const Char* {
+ context_.advance_to(begin);
+ // id >= 0 check is a workaround for gcc 10 bug (#2065).
+ return id >= 0 && id < num_args ? parse_funcs_[id](context_) : begin;
+ }
+
+ FMT_CONSTEXPR void on_error(const char* message) {
+ throw_format_error(message);
+ }
+};
+
+// Reports a compile-time error if S is not a valid format string.
+template <typename..., typename S, FMT_ENABLE_IF(!is_compile_string<S>::value)>
+FMT_INLINE void check_format_string(const S&) {
+#ifdef FMT_ENFORCE_COMPILE_STRING
+ static_assert(is_compile_string<S>::value,
+ "FMT_ENFORCE_COMPILE_STRING requires all format strings to use "
+ "FMT_STRING.");
+#endif
+}
+template <typename... Args, typename S,
+ FMT_ENABLE_IF(is_compile_string<S>::value)>
+void check_format_string(S format_str) {
+ using char_t = typename S::char_type;
+ FMT_CONSTEXPR auto s = basic_string_view<char_t>(format_str);
+ using checker = format_string_checker<char_t, remove_cvref_t<Args>...>;
+ FMT_CONSTEXPR bool error = (parse_format_string<true>(s, checker(s)), true);
+ ignore_unused(error);
+}
+
+template <typename Char = char> struct vformat_args {
+ using type = basic_format_args<
+ basic_format_context<std::back_insert_iterator<buffer<Char>>, Char>>;
+};
+template <> struct vformat_args<char> {
+ using type = format_args;
+};
+
+// Use vformat_args and avoid type_identity to keep symbols short.
+template <typename Char>
+void vformat_to(buffer<Char>& buf, basic_string_view<Char> fmt,
+ typename vformat_args<Char>::type args, locale_ref loc = {});
+
+FMT_API void vprint_mojibake(std::FILE*, string_view, format_args);
+#ifndef _WIN32
+inline void vprint_mojibake(std::FILE*, string_view, format_args) {}
+#endif
+} // namespace detail
+
+FMT_BEGIN_EXPORT
+
+// A formatter specialization for natively supported types.
+template <typename T, typename Char>
+struct formatter<T, Char,
+ enable_if_t<detail::type_constant<T, Char>::value !=
+ detail::type::custom_type>> {
+ private:
+ detail::dynamic_format_specs<Char> specs_;
+
+ public:
+ template <typename ParseContext>
+ FMT_CONSTEXPR auto parse(ParseContext& ctx) -> const Char* {
+ auto type = detail::type_constant<T, Char>::value;
+ auto end =
+ detail::parse_format_specs(ctx.begin(), ctx.end(), specs_, ctx, type);
+ if (type == detail::type::char_type) detail::check_char_specs(specs_);
+ return end;
+ }
+
+ template <detail::type U = detail::type_constant<T, Char>::value,
+ FMT_ENABLE_IF(U == detail::type::string_type ||
+ U == detail::type::cstring_type ||
+ U == detail::type::char_type)>
+ FMT_CONSTEXPR void set_debug_format(bool set = true) {
+ specs_.type = set ? presentation_type::debug : presentation_type::none;
+ }
+
+ template <typename FormatContext>
+ FMT_CONSTEXPR auto format(const T& val, FormatContext& ctx) const
+ -> decltype(ctx.out());
+};
+
+template <typename Char = char> struct runtime_format_string {
+ basic_string_view<Char> str;
+};
+
+/** A compile-time format string. */
+template <typename Char, typename... Args> class basic_format_string {
+ private:
+ basic_string_view<Char> str_;
+
+ public:
+ template <typename S,
+ FMT_ENABLE_IF(
+ std::is_convertible<const S&, basic_string_view<Char>>::value)>
+ FMT_CONSTEVAL FMT_INLINE basic_format_string(const S& s) : str_(s) {
+ static_assert(
+ detail::count<
+ (std::is_base_of<detail::view, remove_reference_t<Args>>::value &&
+ std::is_reference<Args>::value)...>() == 0,
+ "passing views as lvalues is disallowed");
+#ifdef FMT_HAS_CONSTEVAL
+ if constexpr (detail::count_named_args<Args...>() ==
+ detail::count_statically_named_args<Args...>()) {
+ using checker =
+ detail::format_string_checker<Char, remove_cvref_t<Args>...>;
+ detail::parse_format_string<true>(str_, checker(s));
+ }
+#else
+ detail::check_format_string<Args...>(s);
+#endif
+ }
+ basic_format_string(runtime_format_string<Char> fmt) : str_(fmt.str) {}
+
+ FMT_INLINE operator basic_string_view<Char>() const { return str_; }
+ FMT_INLINE auto get() const -> basic_string_view<Char> { return str_; }
+};
+
+#if FMT_GCC_VERSION && FMT_GCC_VERSION < 409
+// Workaround broken conversion on older gcc.
+template <typename...> using format_string = string_view;
+inline auto runtime(string_view s) -> string_view { return s; }
+#else
+template <typename... Args>
+using format_string = basic_format_string<char, type_identity_t<Args>...>;
+/**
+ \rst
+ Creates a runtime format string.
+
+ **Example**::
+
+ // Check format string at runtime instead of compile-time.
+ fmt::print(fmt::runtime("{:d}"), "I am not a number");
+ \endrst
+ */
+inline auto runtime(string_view s) -> runtime_format_string<> { return {{s}}; }
+#endif
+
+FMT_API auto vformat(string_view fmt, format_args args) -> std::string;
+
+/**
+ \rst
+ Formats ``args`` according to specifications in ``fmt`` and returns the result
+ as a string.
+
+ **Example**::
+
+ #include <fmt/core.h>
+ std::string message = fmt::format("The answer is {}.", 42);
+ \endrst
+*/
+template <typename... T>
+FMT_NODISCARD FMT_INLINE auto format(format_string<T...> fmt, T&&... args)
+ -> std::string {
+ return vformat(fmt, fmt::make_format_args(args...));
+}
+
+/** Formats a string and writes the output to ``out``. */
+template <typename OutputIt,
+ FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value)>
+auto vformat_to(OutputIt out, string_view fmt, format_args args) -> OutputIt {
+ auto&& buf = detail::get_buffer<char>(out);
+ detail::vformat_to(buf, fmt, args, {});
+ return detail::get_iterator(buf, out);
+}
+
+/**
+ \rst
+ Formats ``args`` according to specifications in ``fmt``, writes the result to
+ the output iterator ``out`` and returns the iterator past the end of the output
+ range. `format_to` does not append a terminating null character.
+
+ **Example**::
+
+ auto out = std::vector<char>();
+ fmt::format_to(std::back_inserter(out), "{}", 42);
+ \endrst
+ */
+template <typename OutputIt, typename... T,
+ FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value)>
+FMT_INLINE auto format_to(OutputIt out, format_string<T...> fmt, T&&... args)
+ -> OutputIt {
+ return vformat_to(out, fmt, fmt::make_format_args(args...));
+}
+
+template <typename OutputIt> struct format_to_n_result {
+ /** Iterator past the end of the output range. */
+ OutputIt out;
+ /** Total (not truncated) output size. */
+ size_t size;
+};
+
+template <typename OutputIt, typename... T,
+ FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value)>
+auto vformat_to_n(OutputIt out, size_t n, string_view fmt, format_args args)
+ -> format_to_n_result<OutputIt> {
+ using traits = detail::fixed_buffer_traits;
+ auto buf = detail::iterator_buffer<OutputIt, char, traits>(out, n);
+ detail::vformat_to(buf, fmt, args, {});
+ return {buf.out(), buf.count()};
+}
+
+/**
+ \rst
+ Formats ``args`` according to specifications in ``fmt``, writes up to ``n``
+ characters of the result to the output iterator ``out`` and returns the total
+ (not truncated) output size and the iterator past the end of the output range.
+ `format_to_n` does not append a terminating null character.
+ \endrst
+ */
+template <typename OutputIt, typename... T,
+ FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value)>
+FMT_INLINE auto format_to_n(OutputIt out, size_t n, format_string<T...> fmt,
+ T&&... args) -> format_to_n_result<OutputIt> {
+ return vformat_to_n(out, n, fmt, fmt::make_format_args(args...));
+}
+
+/** Returns the number of chars in the output of ``format(fmt, args...)``. */
+template <typename... T>
+FMT_NODISCARD FMT_INLINE auto formatted_size(format_string<T...> fmt,
+ T&&... args) -> size_t {
+ auto buf = detail::counting_buffer<>();
+ detail::vformat_to<char>(buf, fmt, fmt::make_format_args(args...), {});
+ return buf.count();
+}
+
+FMT_API void vprint(string_view fmt, format_args args);
+FMT_API void vprint(std::FILE* f, string_view fmt, format_args args);
+
+/**
+ \rst
+ Formats ``args`` according to specifications in ``fmt`` and writes the output
+ to ``stdout``.
+
+ **Example**::
+
+ fmt::print("Elapsed time: {0:.2f} seconds", 1.23);
+ \endrst
+ */
+template <typename... T>
+FMT_INLINE void print(format_string<T...> fmt, T&&... args) {
+ const auto& vargs = fmt::make_format_args(args...);
+ return detail::is_utf8() ? vprint(fmt, vargs)
+ : detail::vprint_mojibake(stdout, fmt, vargs);
+}
+
+/**
+ \rst
+ Formats ``args`` according to specifications in ``fmt`` and writes the
+ output to the file ``f``.
+
+ **Example**::
+
+ fmt::print(stderr, "Don't {}!", "panic");
+ \endrst
+ */
+template <typename... T>
+FMT_INLINE void print(std::FILE* f, format_string<T...> fmt, T&&... args) {
+ const auto& vargs = fmt::make_format_args(args...);
+ return detail::is_utf8() ? vprint(f, fmt, vargs)
+ : detail::vprint_mojibake(f, fmt, vargs);
+}
+
+/**
+ Formats ``args`` according to specifications in ``fmt`` and writes the
+ output to the file ``f`` followed by a newline.
+ */
+template <typename... T>
+FMT_INLINE void println(std::FILE* f, format_string<T...> fmt, T&&... args) {
+ return fmt::print(f, "{}\n", fmt::format(fmt, std::forward<T>(args)...));
+}
+
+/**
+ Formats ``args`` according to specifications in ``fmt`` and writes the output
+ to ``stdout`` followed by a newline.
+ */
+template <typename... T>
+FMT_INLINE void println(format_string<T...> fmt, T&&... args) {
+ return fmt::println(stdout, fmt, std::forward<T>(args)...);
+}
+
+FMT_END_EXPORT
+FMT_GCC_PRAGMA("GCC pop_options")
+FMT_END_NAMESPACE
+
+#ifdef FMT_HEADER_ONLY
+# include "format.h"
+#endif
+#endif // FMT_CORE_H_
--- /dev/null
+// Formatting library for C++ - implementation
+//
+// Copyright (c) 2012 - 2016, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#ifndef FMT_FORMAT_INL_H_
+#define FMT_FORMAT_INL_H_
+
+#include <algorithm>
+#include <cerrno> // errno
+#include <climits>
+#include <cmath>
+#include <exception>
+
+#ifndef FMT_STATIC_THOUSANDS_SEPARATOR
+# include <locale>
+#endif
+
+#if defined(_WIN32) && !defined(FMT_WINDOWS_NO_WCHAR)
+# include <io.h> // _isatty
+#endif
+
+#include "format.h"
+
+FMT_BEGIN_NAMESPACE
+namespace detail {
+
+FMT_FUNC void assert_fail(const char* file, int line, const char* message) {
+ // Use unchecked std::fprintf to avoid triggering another assertion when
+ // writing to stderr fails
+ std::fprintf(stderr, "%s:%d: assertion failed: %s", file, line, message);
+ // Chosen instead of std::abort to satisfy Clang in CUDA mode during device
+ // code pass.
+ std::terminate();
+}
+
+FMT_FUNC void throw_format_error(const char* message) {
+ FMT_THROW(format_error(message));
+}
+
+FMT_FUNC void format_error_code(detail::buffer<char>& out, int error_code,
+ string_view message) noexcept {
+ // Report error code making sure that the output fits into
+ // inline_buffer_size to avoid dynamic memory allocation and potential
+ // bad_alloc.
+ out.try_resize(0);
+ static const char SEP[] = ": ";
+ static const char ERROR_STR[] = "error ";
+ // Subtract 2 to account for terminating null characters in SEP and ERROR_STR.
+ size_t error_code_size = sizeof(SEP) + sizeof(ERROR_STR) - 2;
+ auto abs_value = static_cast<uint32_or_64_or_128_t<int>>(error_code);
+ if (detail::is_negative(error_code)) {
+ abs_value = 0 - abs_value;
+ ++error_code_size;
+ }
+ error_code_size += detail::to_unsigned(detail::count_digits(abs_value));
+ auto it = buffer_appender<char>(out);
+ if (message.size() <= inline_buffer_size - error_code_size)
+ fmt::format_to(it, FMT_STRING("{}{}"), message, SEP);
+ fmt::format_to(it, FMT_STRING("{}{}"), ERROR_STR, error_code);
+ FMT_ASSERT(out.size() <= inline_buffer_size, "");
+}
+
+FMT_FUNC void report_error(format_func func, int error_code,
+ const char* message) noexcept {
+ memory_buffer full_message;
+ func(full_message, error_code, message);
+ // Don't use fwrite_fully because the latter may throw.
+ if (std::fwrite(full_message.data(), full_message.size(), 1, stderr) > 0)
+ std::fputc('\n', stderr);
+}
+
+// A wrapper around fwrite that throws on error.
+inline void fwrite_fully(const void* ptr, size_t count, FILE* stream) {
+ size_t written = std::fwrite(ptr, 1, count, stream);
+ if (written < count)
+ FMT_THROW(system_error(errno, FMT_STRING("cannot write to file")));
+}
+
+#ifndef FMT_STATIC_THOUSANDS_SEPARATOR
+template <typename Locale>
+locale_ref::locale_ref(const Locale& loc) : locale_(&loc) {
+ static_assert(std::is_same<Locale, std::locale>::value, "");
+}
+
+template <typename Locale> auto locale_ref::get() const -> Locale {
+ static_assert(std::is_same<Locale, std::locale>::value, "");
+ return locale_ ? *static_cast<const std::locale*>(locale_) : std::locale();
+}
+
+template <typename Char>
+FMT_FUNC auto thousands_sep_impl(locale_ref loc) -> thousands_sep_result<Char> {
+ auto& facet = std::use_facet<std::numpunct<Char>>(loc.get<std::locale>());
+ auto grouping = facet.grouping();
+ auto thousands_sep = grouping.empty() ? Char() : facet.thousands_sep();
+ return {std::move(grouping), thousands_sep};
+}
+template <typename Char>
+FMT_FUNC auto decimal_point_impl(locale_ref loc) -> Char {
+ return std::use_facet<std::numpunct<Char>>(loc.get<std::locale>())
+ .decimal_point();
+}
+#else
+template <typename Char>
+FMT_FUNC auto thousands_sep_impl(locale_ref) -> thousands_sep_result<Char> {
+ return {"\03", FMT_STATIC_THOUSANDS_SEPARATOR};
+}
+template <typename Char> FMT_FUNC Char decimal_point_impl(locale_ref) {
+ return '.';
+}
+#endif
+
+FMT_FUNC auto write_loc(appender out, loc_value value,
+ const format_specs<>& specs, locale_ref loc) -> bool {
+#ifndef FMT_STATIC_THOUSANDS_SEPARATOR
+ auto locale = loc.get<std::locale>();
+ // We cannot use the num_put<char> facet because it may produce output in
+ // a wrong encoding.
+ using facet = format_facet<std::locale>;
+ if (std::has_facet<facet>(locale))
+ return std::use_facet<facet>(locale).put(out, value, specs);
+ return facet(locale).put(out, value, specs);
+#endif
+ return false;
+}
+} // namespace detail
+
+template <typename Locale> typename Locale::id format_facet<Locale>::id;
+
+#ifndef FMT_STATIC_THOUSANDS_SEPARATOR
+template <typename Locale> format_facet<Locale>::format_facet(Locale& loc) {
+ auto& numpunct = std::use_facet<std::numpunct<char>>(loc);
+ grouping_ = numpunct.grouping();
+ if (!grouping_.empty()) separator_ = std::string(1, numpunct.thousands_sep());
+}
+
+template <>
+FMT_API FMT_FUNC auto format_facet<std::locale>::do_put(
+ appender out, loc_value val, const format_specs<>& specs) const -> bool {
+ return val.visit(
+ detail::loc_writer<>{out, specs, separator_, grouping_, decimal_point_});
+}
+#endif
+
+FMT_FUNC auto vsystem_error(int error_code, string_view fmt, format_args args)
+ -> std::system_error {
+ auto ec = std::error_code(error_code, std::generic_category());
+ return std::system_error(ec, vformat(fmt, args));
+}
+
+namespace detail {
+
+template <typename F>
+inline auto operator==(basic_fp<F> x, basic_fp<F> y) -> bool {
+ return x.f == y.f && x.e == y.e;
+}
+
+// Compilers should be able to optimize this into the ror instruction.
+FMT_CONSTEXPR inline auto rotr(uint32_t n, uint32_t r) noexcept -> uint32_t {
+ r &= 31;
+ return (n >> r) | (n << (32 - r));
+}
+FMT_CONSTEXPR inline auto rotr(uint64_t n, uint32_t r) noexcept -> uint64_t {
+ r &= 63;
+ return (n >> r) | (n << (64 - r));
+}
+
+// Implementation of Dragonbox algorithm: https://github.com/jk-jeon/dragonbox.
+namespace dragonbox {
+// Computes upper 64 bits of multiplication of a 32-bit unsigned integer and a
+// 64-bit unsigned integer.
+inline auto umul96_upper64(uint32_t x, uint64_t y) noexcept -> uint64_t {
+ return umul128_upper64(static_cast<uint64_t>(x) << 32, y);
+}
+
+// Computes lower 128 bits of multiplication of a 64-bit unsigned integer and a
+// 128-bit unsigned integer.
+inline auto umul192_lower128(uint64_t x, uint128_fallback y) noexcept
+ -> uint128_fallback {
+ uint64_t high = x * y.high();
+ uint128_fallback high_low = umul128(x, y.low());
+ return {high + high_low.high(), high_low.low()};
+}
+
+// Computes lower 64 bits of multiplication of a 32-bit unsigned integer and a
+// 64-bit unsigned integer.
+inline auto umul96_lower64(uint32_t x, uint64_t y) noexcept -> uint64_t {
+ return x * y;
+}
+
+// Various fast log computations.
+inline auto floor_log10_pow2_minus_log10_4_over_3(int e) noexcept -> int {
+ FMT_ASSERT(e <= 2936 && e >= -2985, "too large exponent");
+ return (e * 631305 - 261663) >> 21;
+}
+
+FMT_INLINE_VARIABLE constexpr struct {
+ uint32_t divisor;
+ int shift_amount;
+} div_small_pow10_infos[] = {{10, 16}, {100, 16}};
+
+// Replaces n by floor(n / pow(10, N)) returning true if and only if n is
+// divisible by pow(10, N).
+// Precondition: n <= pow(10, N + 1).
+template <int N>
+auto check_divisibility_and_divide_by_pow10(uint32_t& n) noexcept -> bool {
+ // The numbers below are chosen such that:
+ // 1. floor(n/d) = floor(nm / 2^k) where d=10 or d=100,
+ // 2. nm mod 2^k < m if and only if n is divisible by d,
+ // where m is magic_number, k is shift_amount
+ // and d is divisor.
+ //
+ // Item 1 is a common technique of replacing division by a constant with
+ // multiplication, see e.g. "Division by Invariant Integers Using
+ // Multiplication" by Granlund and Montgomery (1994). magic_number (m) is set
+ // to ceil(2^k/d) for large enough k.
+ // The idea for item 2 originates from Schubfach.
+ constexpr auto info = div_small_pow10_infos[N - 1];
+ FMT_ASSERT(n <= info.divisor * 10, "n is too large");
+ constexpr uint32_t magic_number =
+ (1u << info.shift_amount) / info.divisor + 1;
+ n *= magic_number;
+ const uint32_t comparison_mask = (1u << info.shift_amount) - 1;
+ bool result = (n & comparison_mask) < magic_number;
+ n >>= info.shift_amount;
+ return result;
+}
+
+// Computes floor(n / pow(10, N)) for small n and N.
+// Precondition: n <= pow(10, N + 1).
+template <int N> auto small_division_by_pow10(uint32_t n) noexcept -> uint32_t {
+ constexpr auto info = div_small_pow10_infos[N - 1];
+ FMT_ASSERT(n <= info.divisor * 10, "n is too large");
+ constexpr uint32_t magic_number =
+ (1u << info.shift_amount) / info.divisor + 1;
+ return (n * magic_number) >> info.shift_amount;
+}
+
+// Computes floor(n / 10^(kappa + 1)) (float)
+inline auto divide_by_10_to_kappa_plus_1(uint32_t n) noexcept -> uint32_t {
+ // 1374389535 = ceil(2^37/100)
+ return static_cast<uint32_t>((static_cast<uint64_t>(n) * 1374389535) >> 37);
+}
+// Computes floor(n / 10^(kappa + 1)) (double)
+inline auto divide_by_10_to_kappa_plus_1(uint64_t n) noexcept -> uint64_t {
+ // 2361183241434822607 = ceil(2^(64+7)/1000)
+ return umul128_upper64(n, 2361183241434822607ull) >> 7;
+}
+
+// Various subroutines using pow10 cache
+template <typename T> struct cache_accessor;
+
+template <> struct cache_accessor<float> {
+ using carrier_uint = float_info<float>::carrier_uint;
+ using cache_entry_type = uint64_t;
+
+ static auto get_cached_power(int k) noexcept -> uint64_t {
+ FMT_ASSERT(k >= float_info<float>::min_k && k <= float_info<float>::max_k,
+ "k is out of range");
+ static constexpr const uint64_t pow10_significands[] = {
+ 0x81ceb32c4b43fcf5, 0xa2425ff75e14fc32, 0xcad2f7f5359a3b3f,
+ 0xfd87b5f28300ca0e, 0x9e74d1b791e07e49, 0xc612062576589ddb,
+ 0xf79687aed3eec552, 0x9abe14cd44753b53, 0xc16d9a0095928a28,
+ 0xf1c90080baf72cb2, 0x971da05074da7bef, 0xbce5086492111aeb,
+ 0xec1e4a7db69561a6, 0x9392ee8e921d5d08, 0xb877aa3236a4b44a,
+ 0xe69594bec44de15c, 0x901d7cf73ab0acda, 0xb424dc35095cd810,
+ 0xe12e13424bb40e14, 0x8cbccc096f5088cc, 0xafebff0bcb24aaff,
+ 0xdbe6fecebdedd5bf, 0x89705f4136b4a598, 0xabcc77118461cefd,
+ 0xd6bf94d5e57a42bd, 0x8637bd05af6c69b6, 0xa7c5ac471b478424,
+ 0xd1b71758e219652c, 0x83126e978d4fdf3c, 0xa3d70a3d70a3d70b,
+ 0xcccccccccccccccd, 0x8000000000000000, 0xa000000000000000,
+ 0xc800000000000000, 0xfa00000000000000, 0x9c40000000000000,
+ 0xc350000000000000, 0xf424000000000000, 0x9896800000000000,
+ 0xbebc200000000000, 0xee6b280000000000, 0x9502f90000000000,
+ 0xba43b74000000000, 0xe8d4a51000000000, 0x9184e72a00000000,
+ 0xb5e620f480000000, 0xe35fa931a0000000, 0x8e1bc9bf04000000,
+ 0xb1a2bc2ec5000000, 0xde0b6b3a76400000, 0x8ac7230489e80000,
+ 0xad78ebc5ac620000, 0xd8d726b7177a8000, 0x878678326eac9000,
+ 0xa968163f0a57b400, 0xd3c21bcecceda100, 0x84595161401484a0,
+ 0xa56fa5b99019a5c8, 0xcecb8f27f4200f3a, 0x813f3978f8940985,
+ 0xa18f07d736b90be6, 0xc9f2c9cd04674edf, 0xfc6f7c4045812297,
+ 0x9dc5ada82b70b59e, 0xc5371912364ce306, 0xf684df56c3e01bc7,
+ 0x9a130b963a6c115d, 0xc097ce7bc90715b4, 0xf0bdc21abb48db21,
+ 0x96769950b50d88f5, 0xbc143fa4e250eb32, 0xeb194f8e1ae525fe,
+ 0x92efd1b8d0cf37bf, 0xb7abc627050305ae, 0xe596b7b0c643c71a,
+ 0x8f7e32ce7bea5c70, 0xb35dbf821ae4f38c, 0xe0352f62a19e306f};
+ return pow10_significands[k - float_info<float>::min_k];
+ }
+
+ struct compute_mul_result {
+ carrier_uint result;
+ bool is_integer;
+ };
+ struct compute_mul_parity_result {
+ bool parity;
+ bool is_integer;
+ };
+
+ static auto compute_mul(carrier_uint u,
+ const cache_entry_type& cache) noexcept
+ -> compute_mul_result {
+ auto r = umul96_upper64(u, cache);
+ return {static_cast<carrier_uint>(r >> 32),
+ static_cast<carrier_uint>(r) == 0};
+ }
+
+ static auto compute_delta(const cache_entry_type& cache, int beta) noexcept
+ -> uint32_t {
+ return static_cast<uint32_t>(cache >> (64 - 1 - beta));
+ }
+
+ static auto compute_mul_parity(carrier_uint two_f,
+ const cache_entry_type& cache,
+ int beta) noexcept
+ -> compute_mul_parity_result {
+ FMT_ASSERT(beta >= 1, "");
+ FMT_ASSERT(beta < 64, "");
+
+ auto r = umul96_lower64(two_f, cache);
+ return {((r >> (64 - beta)) & 1) != 0,
+ static_cast<uint32_t>(r >> (32 - beta)) == 0};
+ }
+
+ static auto compute_left_endpoint_for_shorter_interval_case(
+ const cache_entry_type& cache, int beta) noexcept -> carrier_uint {
+ return static_cast<carrier_uint>(
+ (cache - (cache >> (num_significand_bits<float>() + 2))) >>
+ (64 - num_significand_bits<float>() - 1 - beta));
+ }
+
+ static auto compute_right_endpoint_for_shorter_interval_case(
+ const cache_entry_type& cache, int beta) noexcept -> carrier_uint {
+ return static_cast<carrier_uint>(
+ (cache + (cache >> (num_significand_bits<float>() + 1))) >>
+ (64 - num_significand_bits<float>() - 1 - beta));
+ }
+
+ static auto compute_round_up_for_shorter_interval_case(
+ const cache_entry_type& cache, int beta) noexcept -> carrier_uint {
+ return (static_cast<carrier_uint>(
+ cache >> (64 - num_significand_bits<float>() - 2 - beta)) +
+ 1) /
+ 2;
+ }
+};
+
+template <> struct cache_accessor<double> {
+ using carrier_uint = float_info<double>::carrier_uint;
+ using cache_entry_type = uint128_fallback;
+
+ static auto get_cached_power(int k) noexcept -> uint128_fallback {
+ FMT_ASSERT(k >= float_info<double>::min_k && k <= float_info<double>::max_k,
+ "k is out of range");
+
+ static constexpr const uint128_fallback pow10_significands[] = {
+#if FMT_USE_FULL_CACHE_DRAGONBOX
+ {0xff77b1fcbebcdc4f, 0x25e8e89c13bb0f7b},
+ {0x9faacf3df73609b1, 0x77b191618c54e9ad},
+ {0xc795830d75038c1d, 0xd59df5b9ef6a2418},
+ {0xf97ae3d0d2446f25, 0x4b0573286b44ad1e},
+ {0x9becce62836ac577, 0x4ee367f9430aec33},
+ {0xc2e801fb244576d5, 0x229c41f793cda740},
+ {0xf3a20279ed56d48a, 0x6b43527578c11110},
+ {0x9845418c345644d6, 0x830a13896b78aaaa},
+ {0xbe5691ef416bd60c, 0x23cc986bc656d554},
+ {0xedec366b11c6cb8f, 0x2cbfbe86b7ec8aa9},
+ {0x94b3a202eb1c3f39, 0x7bf7d71432f3d6aa},
+ {0xb9e08a83a5e34f07, 0xdaf5ccd93fb0cc54},
+ {0xe858ad248f5c22c9, 0xd1b3400f8f9cff69},
+ {0x91376c36d99995be, 0x23100809b9c21fa2},
+ {0xb58547448ffffb2d, 0xabd40a0c2832a78b},
+ {0xe2e69915b3fff9f9, 0x16c90c8f323f516d},
+ {0x8dd01fad907ffc3b, 0xae3da7d97f6792e4},
+ {0xb1442798f49ffb4a, 0x99cd11cfdf41779d},
+ {0xdd95317f31c7fa1d, 0x40405643d711d584},
+ {0x8a7d3eef7f1cfc52, 0x482835ea666b2573},
+ {0xad1c8eab5ee43b66, 0xda3243650005eed0},
+ {0xd863b256369d4a40, 0x90bed43e40076a83},
+ {0x873e4f75e2224e68, 0x5a7744a6e804a292},
+ {0xa90de3535aaae202, 0x711515d0a205cb37},
+ {0xd3515c2831559a83, 0x0d5a5b44ca873e04},
+ {0x8412d9991ed58091, 0xe858790afe9486c3},
+ {0xa5178fff668ae0b6, 0x626e974dbe39a873},
+ {0xce5d73ff402d98e3, 0xfb0a3d212dc81290},
+ {0x80fa687f881c7f8e, 0x7ce66634bc9d0b9a},
+ {0xa139029f6a239f72, 0x1c1fffc1ebc44e81},
+ {0xc987434744ac874e, 0xa327ffb266b56221},
+ {0xfbe9141915d7a922, 0x4bf1ff9f0062baa9},
+ {0x9d71ac8fada6c9b5, 0x6f773fc3603db4aa},
+ {0xc4ce17b399107c22, 0xcb550fb4384d21d4},
+ {0xf6019da07f549b2b, 0x7e2a53a146606a49},
+ {0x99c102844f94e0fb, 0x2eda7444cbfc426e},
+ {0xc0314325637a1939, 0xfa911155fefb5309},
+ {0xf03d93eebc589f88, 0x793555ab7eba27cb},
+ {0x96267c7535b763b5, 0x4bc1558b2f3458df},
+ {0xbbb01b9283253ca2, 0x9eb1aaedfb016f17},
+ {0xea9c227723ee8bcb, 0x465e15a979c1cadd},
+ {0x92a1958a7675175f, 0x0bfacd89ec191eca},
+ {0xb749faed14125d36, 0xcef980ec671f667c},
+ {0xe51c79a85916f484, 0x82b7e12780e7401b},
+ {0x8f31cc0937ae58d2, 0xd1b2ecb8b0908811},
+ {0xb2fe3f0b8599ef07, 0x861fa7e6dcb4aa16},
+ {0xdfbdcece67006ac9, 0x67a791e093e1d49b},
+ {0x8bd6a141006042bd, 0xe0c8bb2c5c6d24e1},
+ {0xaecc49914078536d, 0x58fae9f773886e19},
+ {0xda7f5bf590966848, 0xaf39a475506a899f},
+ {0x888f99797a5e012d, 0x6d8406c952429604},
+ {0xaab37fd7d8f58178, 0xc8e5087ba6d33b84},
+ {0xd5605fcdcf32e1d6, 0xfb1e4a9a90880a65},
+ {0x855c3be0a17fcd26, 0x5cf2eea09a550680},
+ {0xa6b34ad8c9dfc06f, 0xf42faa48c0ea481f},
+ {0xd0601d8efc57b08b, 0xf13b94daf124da27},
+ {0x823c12795db6ce57, 0x76c53d08d6b70859},
+ {0xa2cb1717b52481ed, 0x54768c4b0c64ca6f},
+ {0xcb7ddcdda26da268, 0xa9942f5dcf7dfd0a},
+ {0xfe5d54150b090b02, 0xd3f93b35435d7c4d},
+ {0x9efa548d26e5a6e1, 0xc47bc5014a1a6db0},
+ {0xc6b8e9b0709f109a, 0x359ab6419ca1091c},
+ {0xf867241c8cc6d4c0, 0xc30163d203c94b63},
+ {0x9b407691d7fc44f8, 0x79e0de63425dcf1e},
+ {0xc21094364dfb5636, 0x985915fc12f542e5},
+ {0xf294b943e17a2bc4, 0x3e6f5b7b17b2939e},
+ {0x979cf3ca6cec5b5a, 0xa705992ceecf9c43},
+ {0xbd8430bd08277231, 0x50c6ff782a838354},
+ {0xece53cec4a314ebd, 0xa4f8bf5635246429},
+ {0x940f4613ae5ed136, 0x871b7795e136be9a},
+ {0xb913179899f68584, 0x28e2557b59846e40},
+ {0xe757dd7ec07426e5, 0x331aeada2fe589d0},
+ {0x9096ea6f3848984f, 0x3ff0d2c85def7622},
+ {0xb4bca50b065abe63, 0x0fed077a756b53aa},
+ {0xe1ebce4dc7f16dfb, 0xd3e8495912c62895},
+ {0x8d3360f09cf6e4bd, 0x64712dd7abbbd95d},
+ {0xb080392cc4349dec, 0xbd8d794d96aacfb4},
+ {0xdca04777f541c567, 0xecf0d7a0fc5583a1},
+ {0x89e42caaf9491b60, 0xf41686c49db57245},
+ {0xac5d37d5b79b6239, 0x311c2875c522ced6},
+ {0xd77485cb25823ac7, 0x7d633293366b828c},
+ {0x86a8d39ef77164bc, 0xae5dff9c02033198},
+ {0xa8530886b54dbdeb, 0xd9f57f830283fdfd},
+ {0xd267caa862a12d66, 0xd072df63c324fd7c},
+ {0x8380dea93da4bc60, 0x4247cb9e59f71e6e},
+ {0xa46116538d0deb78, 0x52d9be85f074e609},
+ {0xcd795be870516656, 0x67902e276c921f8c},
+ {0x806bd9714632dff6, 0x00ba1cd8a3db53b7},
+ {0xa086cfcd97bf97f3, 0x80e8a40eccd228a5},
+ {0xc8a883c0fdaf7df0, 0x6122cd128006b2ce},
+ {0xfad2a4b13d1b5d6c, 0x796b805720085f82},
+ {0x9cc3a6eec6311a63, 0xcbe3303674053bb1},
+ {0xc3f490aa77bd60fc, 0xbedbfc4411068a9d},
+ {0xf4f1b4d515acb93b, 0xee92fb5515482d45},
+ {0x991711052d8bf3c5, 0x751bdd152d4d1c4b},
+ {0xbf5cd54678eef0b6, 0xd262d45a78a0635e},
+ {0xef340a98172aace4, 0x86fb897116c87c35},
+ {0x9580869f0e7aac0e, 0xd45d35e6ae3d4da1},
+ {0xbae0a846d2195712, 0x8974836059cca10a},
+ {0xe998d258869facd7, 0x2bd1a438703fc94c},
+ {0x91ff83775423cc06, 0x7b6306a34627ddd0},
+ {0xb67f6455292cbf08, 0x1a3bc84c17b1d543},
+ {0xe41f3d6a7377eeca, 0x20caba5f1d9e4a94},
+ {0x8e938662882af53e, 0x547eb47b7282ee9d},
+ {0xb23867fb2a35b28d, 0xe99e619a4f23aa44},
+ {0xdec681f9f4c31f31, 0x6405fa00e2ec94d5},
+ {0x8b3c113c38f9f37e, 0xde83bc408dd3dd05},
+ {0xae0b158b4738705e, 0x9624ab50b148d446},
+ {0xd98ddaee19068c76, 0x3badd624dd9b0958},
+ {0x87f8a8d4cfa417c9, 0xe54ca5d70a80e5d7},
+ {0xa9f6d30a038d1dbc, 0x5e9fcf4ccd211f4d},
+ {0xd47487cc8470652b, 0x7647c32000696720},
+ {0x84c8d4dfd2c63f3b, 0x29ecd9f40041e074},
+ {0xa5fb0a17c777cf09, 0xf468107100525891},
+ {0xcf79cc9db955c2cc, 0x7182148d4066eeb5},
+ {0x81ac1fe293d599bf, 0xc6f14cd848405531},
+ {0xa21727db38cb002f, 0xb8ada00e5a506a7d},
+ {0xca9cf1d206fdc03b, 0xa6d90811f0e4851d},
+ {0xfd442e4688bd304a, 0x908f4a166d1da664},
+ {0x9e4a9cec15763e2e, 0x9a598e4e043287ff},
+ {0xc5dd44271ad3cdba, 0x40eff1e1853f29fe},
+ {0xf7549530e188c128, 0xd12bee59e68ef47d},
+ {0x9a94dd3e8cf578b9, 0x82bb74f8301958cf},
+ {0xc13a148e3032d6e7, 0xe36a52363c1faf02},
+ {0xf18899b1bc3f8ca1, 0xdc44e6c3cb279ac2},
+ {0x96f5600f15a7b7e5, 0x29ab103a5ef8c0ba},
+ {0xbcb2b812db11a5de, 0x7415d448f6b6f0e8},
+ {0xebdf661791d60f56, 0x111b495b3464ad22},
+ {0x936b9fcebb25c995, 0xcab10dd900beec35},
+ {0xb84687c269ef3bfb, 0x3d5d514f40eea743},
+ {0xe65829b3046b0afa, 0x0cb4a5a3112a5113},
+ {0x8ff71a0fe2c2e6dc, 0x47f0e785eaba72ac},
+ {0xb3f4e093db73a093, 0x59ed216765690f57},
+ {0xe0f218b8d25088b8, 0x306869c13ec3532d},
+ {0x8c974f7383725573, 0x1e414218c73a13fc},
+ {0xafbd2350644eeacf, 0xe5d1929ef90898fb},
+ {0xdbac6c247d62a583, 0xdf45f746b74abf3a},
+ {0x894bc396ce5da772, 0x6b8bba8c328eb784},
+ {0xab9eb47c81f5114f, 0x066ea92f3f326565},
+ {0xd686619ba27255a2, 0xc80a537b0efefebe},
+ {0x8613fd0145877585, 0xbd06742ce95f5f37},
+ {0xa798fc4196e952e7, 0x2c48113823b73705},
+ {0xd17f3b51fca3a7a0, 0xf75a15862ca504c6},
+ {0x82ef85133de648c4, 0x9a984d73dbe722fc},
+ {0xa3ab66580d5fdaf5, 0xc13e60d0d2e0ebbb},
+ {0xcc963fee10b7d1b3, 0x318df905079926a9},
+ {0xffbbcfe994e5c61f, 0xfdf17746497f7053},
+ {0x9fd561f1fd0f9bd3, 0xfeb6ea8bedefa634},
+ {0xc7caba6e7c5382c8, 0xfe64a52ee96b8fc1},
+ {0xf9bd690a1b68637b, 0x3dfdce7aa3c673b1},
+ {0x9c1661a651213e2d, 0x06bea10ca65c084f},
+ {0xc31bfa0fe5698db8, 0x486e494fcff30a63},
+ {0xf3e2f893dec3f126, 0x5a89dba3c3efccfb},
+ {0x986ddb5c6b3a76b7, 0xf89629465a75e01d},
+ {0xbe89523386091465, 0xf6bbb397f1135824},
+ {0xee2ba6c0678b597f, 0x746aa07ded582e2d},
+ {0x94db483840b717ef, 0xa8c2a44eb4571cdd},
+ {0xba121a4650e4ddeb, 0x92f34d62616ce414},
+ {0xe896a0d7e51e1566, 0x77b020baf9c81d18},
+ {0x915e2486ef32cd60, 0x0ace1474dc1d122f},
+ {0xb5b5ada8aaff80b8, 0x0d819992132456bb},
+ {0xe3231912d5bf60e6, 0x10e1fff697ed6c6a},
+ {0x8df5efabc5979c8f, 0xca8d3ffa1ef463c2},
+ {0xb1736b96b6fd83b3, 0xbd308ff8a6b17cb3},
+ {0xddd0467c64bce4a0, 0xac7cb3f6d05ddbdf},
+ {0x8aa22c0dbef60ee4, 0x6bcdf07a423aa96c},
+ {0xad4ab7112eb3929d, 0x86c16c98d2c953c7},
+ {0xd89d64d57a607744, 0xe871c7bf077ba8b8},
+ {0x87625f056c7c4a8b, 0x11471cd764ad4973},
+ {0xa93af6c6c79b5d2d, 0xd598e40d3dd89bd0},
+ {0xd389b47879823479, 0x4aff1d108d4ec2c4},
+ {0x843610cb4bf160cb, 0xcedf722a585139bb},
+ {0xa54394fe1eedb8fe, 0xc2974eb4ee658829},
+ {0xce947a3da6a9273e, 0x733d226229feea33},
+ {0x811ccc668829b887, 0x0806357d5a3f5260},
+ {0xa163ff802a3426a8, 0xca07c2dcb0cf26f8},
+ {0xc9bcff6034c13052, 0xfc89b393dd02f0b6},
+ {0xfc2c3f3841f17c67, 0xbbac2078d443ace3},
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+ {0xf6c69a72a3989f5b, 0x8aad549e57273d46},
+ {0x9a3c2087a63f6399, 0x36ac54e2f678864c},
+ {0xc0cb28a98fcf3c7f, 0x84576a1bb416a7de},
+ {0xf0fdf2d3f3c30b9f, 0x656d44a2a11c51d6},
+ {0x969eb7c47859e743, 0x9f644ae5a4b1b326},
+ {0xbc4665b596706114, 0x873d5d9f0dde1fef},
+ {0xeb57ff22fc0c7959, 0xa90cb506d155a7eb},
+ {0x9316ff75dd87cbd8, 0x09a7f12442d588f3},
+ {0xb7dcbf5354e9bece, 0x0c11ed6d538aeb30},
+ {0xe5d3ef282a242e81, 0x8f1668c8a86da5fb},
+ {0x8fa475791a569d10, 0xf96e017d694487bd},
+ {0xb38d92d760ec4455, 0x37c981dcc395a9ad},
+ {0xe070f78d3927556a, 0x85bbe253f47b1418},
+ {0x8c469ab843b89562, 0x93956d7478ccec8f},
+ {0xaf58416654a6babb, 0x387ac8d1970027b3},
+ {0xdb2e51bfe9d0696a, 0x06997b05fcc0319f},
+ {0x88fcf317f22241e2, 0x441fece3bdf81f04},
+ {0xab3c2fddeeaad25a, 0xd527e81cad7626c4},
+ {0xd60b3bd56a5586f1, 0x8a71e223d8d3b075},
+ {0x85c7056562757456, 0xf6872d5667844e4a},
+ {0xa738c6bebb12d16c, 0xb428f8ac016561dc},
+ {0xd106f86e69d785c7, 0xe13336d701beba53},
+ {0x82a45b450226b39c, 0xecc0024661173474},
+ {0xa34d721642b06084, 0x27f002d7f95d0191},
+ {0xcc20ce9bd35c78a5, 0x31ec038df7b441f5},
+ {0xff290242c83396ce, 0x7e67047175a15272},
+ {0x9f79a169bd203e41, 0x0f0062c6e984d387},
+ {0xc75809c42c684dd1, 0x52c07b78a3e60869},
+ {0xf92e0c3537826145, 0xa7709a56ccdf8a83},
+ {0x9bbcc7a142b17ccb, 0x88a66076400bb692},
+ {0xc2abf989935ddbfe, 0x6acff893d00ea436},
+ {0xf356f7ebf83552fe, 0x0583f6b8c4124d44},
+ {0x98165af37b2153de, 0xc3727a337a8b704b},
+ {0xbe1bf1b059e9a8d6, 0x744f18c0592e4c5d},
+ {0xeda2ee1c7064130c, 0x1162def06f79df74},
+ {0x9485d4d1c63e8be7, 0x8addcb5645ac2ba9},
+ {0xb9a74a0637ce2ee1, 0x6d953e2bd7173693},
+ {0xe8111c87c5c1ba99, 0xc8fa8db6ccdd0438},
+ {0x910ab1d4db9914a0, 0x1d9c9892400a22a3},
+ {0xb54d5e4a127f59c8, 0x2503beb6d00cab4c},
+ {0xe2a0b5dc971f303a, 0x2e44ae64840fd61e},
+ {0x8da471a9de737e24, 0x5ceaecfed289e5d3},
+ {0xb10d8e1456105dad, 0x7425a83e872c5f48},
+ {0xdd50f1996b947518, 0xd12f124e28f7771a},
+ {0x8a5296ffe33cc92f, 0x82bd6b70d99aaa70},
+ {0xace73cbfdc0bfb7b, 0x636cc64d1001550c},
+ {0xd8210befd30efa5a, 0x3c47f7e05401aa4f},
+ {0x8714a775e3e95c78, 0x65acfaec34810a72},
+ {0xa8d9d1535ce3b396, 0x7f1839a741a14d0e},
+ {0xd31045a8341ca07c, 0x1ede48111209a051},
+ {0x83ea2b892091e44d, 0x934aed0aab460433},
+ {0xa4e4b66b68b65d60, 0xf81da84d56178540},
+ {0xce1de40642e3f4b9, 0x36251260ab9d668f},
+ {0x80d2ae83e9ce78f3, 0xc1d72b7c6b42601a},
+ {0xa1075a24e4421730, 0xb24cf65b8612f820},
+ {0xc94930ae1d529cfc, 0xdee033f26797b628},
+ {0xfb9b7cd9a4a7443c, 0x169840ef017da3b2},
+ {0x9d412e0806e88aa5, 0x8e1f289560ee864f},
+ {0xc491798a08a2ad4e, 0xf1a6f2bab92a27e3},
+ {0xf5b5d7ec8acb58a2, 0xae10af696774b1dc},
+ {0x9991a6f3d6bf1765, 0xacca6da1e0a8ef2a},
+ {0xbff610b0cc6edd3f, 0x17fd090a58d32af4},
+ {0xeff394dcff8a948e, 0xddfc4b4cef07f5b1},
+ {0x95f83d0a1fb69cd9, 0x4abdaf101564f98f},
+ {0xbb764c4ca7a4440f, 0x9d6d1ad41abe37f2},
+ {0xea53df5fd18d5513, 0x84c86189216dc5ee},
+ {0x92746b9be2f8552c, 0x32fd3cf5b4e49bb5},
+ {0xb7118682dbb66a77, 0x3fbc8c33221dc2a2},
+ {0xe4d5e82392a40515, 0x0fabaf3feaa5334b},
+ {0x8f05b1163ba6832d, 0x29cb4d87f2a7400f},
+ {0xb2c71d5bca9023f8, 0x743e20e9ef511013},
+ {0xdf78e4b2bd342cf6, 0x914da9246b255417},
+ {0x8bab8eefb6409c1a, 0x1ad089b6c2f7548f},
+ {0xae9672aba3d0c320, 0xa184ac2473b529b2},
+ {0xda3c0f568cc4f3e8, 0xc9e5d72d90a2741f},
+ {0x8865899617fb1871, 0x7e2fa67c7a658893},
+ {0xaa7eebfb9df9de8d, 0xddbb901b98feeab8},
+ {0xd51ea6fa85785631, 0x552a74227f3ea566},
+ {0x8533285c936b35de, 0xd53a88958f872760},
+ {0xa67ff273b8460356, 0x8a892abaf368f138},
+ {0xd01fef10a657842c, 0x2d2b7569b0432d86},
+ {0x8213f56a67f6b29b, 0x9c3b29620e29fc74},
+ {0xa298f2c501f45f42, 0x8349f3ba91b47b90},
+ {0xcb3f2f7642717713, 0x241c70a936219a74},
+ {0xfe0efb53d30dd4d7, 0xed238cd383aa0111},
+ {0x9ec95d1463e8a506, 0xf4363804324a40ab},
+ {0xc67bb4597ce2ce48, 0xb143c6053edcd0d6},
+ {0xf81aa16fdc1b81da, 0xdd94b7868e94050b},
+ {0x9b10a4e5e9913128, 0xca7cf2b4191c8327},
+ {0xc1d4ce1f63f57d72, 0xfd1c2f611f63a3f1},
+ {0xf24a01a73cf2dccf, 0xbc633b39673c8ced},
+ {0x976e41088617ca01, 0xd5be0503e085d814},
+ {0xbd49d14aa79dbc82, 0x4b2d8644d8a74e19},
+ {0xec9c459d51852ba2, 0xddf8e7d60ed1219f},
+ {0x93e1ab8252f33b45, 0xcabb90e5c942b504},
+ {0xb8da1662e7b00a17, 0x3d6a751f3b936244},
+ {0xe7109bfba19c0c9d, 0x0cc512670a783ad5},
+ {0x906a617d450187e2, 0x27fb2b80668b24c6},
+ {0xb484f9dc9641e9da, 0xb1f9f660802dedf7},
+ {0xe1a63853bbd26451, 0x5e7873f8a0396974},
+ {0x8d07e33455637eb2, 0xdb0b487b6423e1e9},
+ {0xb049dc016abc5e5f, 0x91ce1a9a3d2cda63},
+ {0xdc5c5301c56b75f7, 0x7641a140cc7810fc},
+ {0x89b9b3e11b6329ba, 0xa9e904c87fcb0a9e},
+ {0xac2820d9623bf429, 0x546345fa9fbdcd45},
+ {0xd732290fbacaf133, 0xa97c177947ad4096},
+ {0x867f59a9d4bed6c0, 0x49ed8eabcccc485e},
+ {0xa81f301449ee8c70, 0x5c68f256bfff5a75},
+ {0xd226fc195c6a2f8c, 0x73832eec6fff3112},
+ {0x83585d8fd9c25db7, 0xc831fd53c5ff7eac},
+ {0xa42e74f3d032f525, 0xba3e7ca8b77f5e56},
+ {0xcd3a1230c43fb26f, 0x28ce1bd2e55f35ec},
+ {0x80444b5e7aa7cf85, 0x7980d163cf5b81b4},
+ {0xa0555e361951c366, 0xd7e105bcc3326220},
+ {0xc86ab5c39fa63440, 0x8dd9472bf3fefaa8},
+ {0xfa856334878fc150, 0xb14f98f6f0feb952},
+ {0x9c935e00d4b9d8d2, 0x6ed1bf9a569f33d4},
+ {0xc3b8358109e84f07, 0x0a862f80ec4700c9},
+ {0xf4a642e14c6262c8, 0xcd27bb612758c0fb},
+ {0x98e7e9cccfbd7dbd, 0x8038d51cb897789d},
+ {0xbf21e44003acdd2c, 0xe0470a63e6bd56c4},
+ {0xeeea5d5004981478, 0x1858ccfce06cac75},
+ {0x95527a5202df0ccb, 0x0f37801e0c43ebc9},
+ {0xbaa718e68396cffd, 0xd30560258f54e6bb},
+ {0xe950df20247c83fd, 0x47c6b82ef32a206a},
+ {0x91d28b7416cdd27e, 0x4cdc331d57fa5442},
+ {0xb6472e511c81471d, 0xe0133fe4adf8e953},
+ {0xe3d8f9e563a198e5, 0x58180fddd97723a7},
+ {0x8e679c2f5e44ff8f, 0x570f09eaa7ea7649},
+ {0xb201833b35d63f73, 0x2cd2cc6551e513db},
+ {0xde81e40a034bcf4f, 0xf8077f7ea65e58d2},
+ {0x8b112e86420f6191, 0xfb04afaf27faf783},
+ {0xadd57a27d29339f6, 0x79c5db9af1f9b564},
+ {0xd94ad8b1c7380874, 0x18375281ae7822bd},
+ {0x87cec76f1c830548, 0x8f2293910d0b15b6},
+ {0xa9c2794ae3a3c69a, 0xb2eb3875504ddb23},
+ {0xd433179d9c8cb841, 0x5fa60692a46151ec},
+ {0x849feec281d7f328, 0xdbc7c41ba6bcd334},
+ {0xa5c7ea73224deff3, 0x12b9b522906c0801},
+ {0xcf39e50feae16bef, 0xd768226b34870a01},
+ {0x81842f29f2cce375, 0xe6a1158300d46641},
+ {0xa1e53af46f801c53, 0x60495ae3c1097fd1},
+ {0xca5e89b18b602368, 0x385bb19cb14bdfc5},
+ {0xfcf62c1dee382c42, 0x46729e03dd9ed7b6},
+ {0x9e19db92b4e31ba9, 0x6c07a2c26a8346d2},
+ {0xc5a05277621be293, 0xc7098b7305241886},
+ {0xf70867153aa2db38, 0xb8cbee4fc66d1ea8},
+ {0x9a65406d44a5c903, 0x737f74f1dc043329},
+ {0xc0fe908895cf3b44, 0x505f522e53053ff3},
+ {0xf13e34aabb430a15, 0x647726b9e7c68ff0},
+ {0x96c6e0eab509e64d, 0x5eca783430dc19f6},
+ {0xbc789925624c5fe0, 0xb67d16413d132073},
+ {0xeb96bf6ebadf77d8, 0xe41c5bd18c57e890},
+ {0x933e37a534cbaae7, 0x8e91b962f7b6f15a},
+ {0xb80dc58e81fe95a1, 0x723627bbb5a4adb1},
+ {0xe61136f2227e3b09, 0xcec3b1aaa30dd91d},
+ {0x8fcac257558ee4e6, 0x213a4f0aa5e8a7b2},
+ {0xb3bd72ed2af29e1f, 0xa988e2cd4f62d19e},
+ {0xe0accfa875af45a7, 0x93eb1b80a33b8606},
+ {0x8c6c01c9498d8b88, 0xbc72f130660533c4},
+ {0xaf87023b9bf0ee6a, 0xeb8fad7c7f8680b5},
+ {0xdb68c2ca82ed2a05, 0xa67398db9f6820e2},
+#else
+ {0xff77b1fcbebcdc4f, 0x25e8e89c13bb0f7b},
+ {0xce5d73ff402d98e3, 0xfb0a3d212dc81290},
+ {0xa6b34ad8c9dfc06f, 0xf42faa48c0ea481f},
+ {0x86a8d39ef77164bc, 0xae5dff9c02033198},
+ {0xd98ddaee19068c76, 0x3badd624dd9b0958},
+ {0xafbd2350644eeacf, 0xe5d1929ef90898fb},
+ {0x8df5efabc5979c8f, 0xca8d3ffa1ef463c2},
+ {0xe55990879ddcaabd, 0xcc420a6a101d0516},
+ {0xb94470938fa89bce, 0xf808e40e8d5b3e6a},
+ {0x95a8637627989aad, 0xdde7001379a44aa9},
+ {0xf1c90080baf72cb1, 0x5324c68b12dd6339},
+ {0xc350000000000000, 0x0000000000000000},
+ {0x9dc5ada82b70b59d, 0xf020000000000000},
+ {0xfee50b7025c36a08, 0x02f236d04753d5b5},
+ {0xcde6fd5e09abcf26, 0xed4c0226b55e6f87},
+ {0xa6539930bf6bff45, 0x84db8346b786151d},
+ {0x865b86925b9bc5c2, 0x0b8a2392ba45a9b3},
+ {0xd910f7ff28069da4, 0x1b2ba1518094da05},
+ {0xaf58416654a6babb, 0x387ac8d1970027b3},
+ {0x8da471a9de737e24, 0x5ceaecfed289e5d3},
+ {0xe4d5e82392a40515, 0x0fabaf3feaa5334b},
+ {0xb8da1662e7b00a17, 0x3d6a751f3b936244},
+ {0x95527a5202df0ccb, 0x0f37801e0c43ebc9},
+ {0xf13e34aabb430a15, 0x647726b9e7c68ff0}
+#endif
+ };
+
+#if FMT_USE_FULL_CACHE_DRAGONBOX
+ return pow10_significands[k - float_info<double>::min_k];
+#else
+ static constexpr const uint64_t powers_of_5_64[] = {
+ 0x0000000000000001, 0x0000000000000005, 0x0000000000000019,
+ 0x000000000000007d, 0x0000000000000271, 0x0000000000000c35,
+ 0x0000000000003d09, 0x000000000001312d, 0x000000000005f5e1,
+ 0x00000000001dcd65, 0x00000000009502f9, 0x0000000002e90edd,
+ 0x000000000e8d4a51, 0x0000000048c27395, 0x000000016bcc41e9,
+ 0x000000071afd498d, 0x0000002386f26fc1, 0x000000b1a2bc2ec5,
+ 0x000003782dace9d9, 0x00001158e460913d, 0x000056bc75e2d631,
+ 0x0001b1ae4d6e2ef5, 0x000878678326eac9, 0x002a5a058fc295ed,
+ 0x00d3c21bcecceda1, 0x0422ca8b0a00a425, 0x14adf4b7320334b9};
+
+ static const int compression_ratio = 27;
+
+ // Compute base index.
+ int cache_index = (k - float_info<double>::min_k) / compression_ratio;
+ int kb = cache_index * compression_ratio + float_info<double>::min_k;
+ int offset = k - kb;
+
+ // Get base cache.
+ uint128_fallback base_cache = pow10_significands[cache_index];
+ if (offset == 0) return base_cache;
+
+ // Compute the required amount of bit-shift.
+ int alpha = floor_log2_pow10(kb + offset) - floor_log2_pow10(kb) - offset;
+ FMT_ASSERT(alpha > 0 && alpha < 64, "shifting error detected");
+
+ // Try to recover the real cache.
+ uint64_t pow5 = powers_of_5_64[offset];
+ uint128_fallback recovered_cache = umul128(base_cache.high(), pow5);
+ uint128_fallback middle_low = umul128(base_cache.low(), pow5);
+
+ recovered_cache += middle_low.high();
+
+ uint64_t high_to_middle = recovered_cache.high() << (64 - alpha);
+ uint64_t middle_to_low = recovered_cache.low() << (64 - alpha);
+
+ recovered_cache =
+ uint128_fallback{(recovered_cache.low() >> alpha) | high_to_middle,
+ ((middle_low.low() >> alpha) | middle_to_low)};
+ FMT_ASSERT(recovered_cache.low() + 1 != 0, "");
+ return {recovered_cache.high(), recovered_cache.low() + 1};
+#endif
+ }
+
+ struct compute_mul_result {
+ carrier_uint result;
+ bool is_integer;
+ };
+ struct compute_mul_parity_result {
+ bool parity;
+ bool is_integer;
+ };
+
+ static auto compute_mul(carrier_uint u,
+ const cache_entry_type& cache) noexcept
+ -> compute_mul_result {
+ auto r = umul192_upper128(u, cache);
+ return {r.high(), r.low() == 0};
+ }
+
+ static auto compute_delta(cache_entry_type const& cache, int beta) noexcept
+ -> uint32_t {
+ return static_cast<uint32_t>(cache.high() >> (64 - 1 - beta));
+ }
+
+ static auto compute_mul_parity(carrier_uint two_f,
+ const cache_entry_type& cache,
+ int beta) noexcept
+ -> compute_mul_parity_result {
+ FMT_ASSERT(beta >= 1, "");
+ FMT_ASSERT(beta < 64, "");
+
+ auto r = umul192_lower128(two_f, cache);
+ return {((r.high() >> (64 - beta)) & 1) != 0,
+ ((r.high() << beta) | (r.low() >> (64 - beta))) == 0};
+ }
+
+ static auto compute_left_endpoint_for_shorter_interval_case(
+ const cache_entry_type& cache, int beta) noexcept -> carrier_uint {
+ return (cache.high() -
+ (cache.high() >> (num_significand_bits<double>() + 2))) >>
+ (64 - num_significand_bits<double>() - 1 - beta);
+ }
+
+ static auto compute_right_endpoint_for_shorter_interval_case(
+ const cache_entry_type& cache, int beta) noexcept -> carrier_uint {
+ return (cache.high() +
+ (cache.high() >> (num_significand_bits<double>() + 1))) >>
+ (64 - num_significand_bits<double>() - 1 - beta);
+ }
+
+ static auto compute_round_up_for_shorter_interval_case(
+ const cache_entry_type& cache, int beta) noexcept -> carrier_uint {
+ return ((cache.high() >> (64 - num_significand_bits<double>() - 2 - beta)) +
+ 1) /
+ 2;
+ }
+};
+
+FMT_FUNC auto get_cached_power(int k) noexcept -> uint128_fallback {
+ return cache_accessor<double>::get_cached_power(k);
+}
+
+// Various integer checks
+template <typename T>
+auto is_left_endpoint_integer_shorter_interval(int exponent) noexcept -> bool {
+ const int case_shorter_interval_left_endpoint_lower_threshold = 2;
+ const int case_shorter_interval_left_endpoint_upper_threshold = 3;
+ return exponent >= case_shorter_interval_left_endpoint_lower_threshold &&
+ exponent <= case_shorter_interval_left_endpoint_upper_threshold;
+}
+
+// Remove trailing zeros from n and return the number of zeros removed (float)
+FMT_INLINE int remove_trailing_zeros(uint32_t& n, int s = 0) noexcept {
+ FMT_ASSERT(n != 0, "");
+ // Modular inverse of 5 (mod 2^32): (mod_inv_5 * 5) mod 2^32 = 1.
+ constexpr uint32_t mod_inv_5 = 0xcccccccd;
+ constexpr uint32_t mod_inv_25 = 0xc28f5c29; // = mod_inv_5 * mod_inv_5
+
+ while (true) {
+ auto q = rotr(n * mod_inv_25, 2);
+ if (q > max_value<uint32_t>() / 100) break;
+ n = q;
+ s += 2;
+ }
+ auto q = rotr(n * mod_inv_5, 1);
+ if (q <= max_value<uint32_t>() / 10) {
+ n = q;
+ s |= 1;
+ }
+ return s;
+}
+
+// Removes trailing zeros and returns the number of zeros removed (double)
+FMT_INLINE int remove_trailing_zeros(uint64_t& n) noexcept {
+ FMT_ASSERT(n != 0, "");
+
+ // This magic number is ceil(2^90 / 10^8).
+ constexpr uint64_t magic_number = 12379400392853802749ull;
+ auto nm = umul128(n, magic_number);
+
+ // Is n is divisible by 10^8?
+ if ((nm.high() & ((1ull << (90 - 64)) - 1)) == 0 && nm.low() < magic_number) {
+ // If yes, work with the quotient...
+ auto n32 = static_cast<uint32_t>(nm.high() >> (90 - 64));
+ // ... and use the 32 bit variant of the function
+ int s = remove_trailing_zeros(n32, 8);
+ n = n32;
+ return s;
+ }
+
+ // If n is not divisible by 10^8, work with n itself.
+ constexpr uint64_t mod_inv_5 = 0xcccccccccccccccd;
+ constexpr uint64_t mod_inv_25 = 0x8f5c28f5c28f5c29; // mod_inv_5 * mod_inv_5
+
+ int s = 0;
+ while (true) {
+ auto q = rotr(n * mod_inv_25, 2);
+ if (q > max_value<uint64_t>() / 100) break;
+ n = q;
+ s += 2;
+ }
+ auto q = rotr(n * mod_inv_5, 1);
+ if (q <= max_value<uint64_t>() / 10) {
+ n = q;
+ s |= 1;
+ }
+
+ return s;
+}
+
+// The main algorithm for shorter interval case
+template <typename T>
+FMT_INLINE decimal_fp<T> shorter_interval_case(int exponent) noexcept {
+ decimal_fp<T> ret_value;
+ // Compute k and beta
+ const int minus_k = floor_log10_pow2_minus_log10_4_over_3(exponent);
+ const int beta = exponent + floor_log2_pow10(-minus_k);
+
+ // Compute xi and zi
+ using cache_entry_type = typename cache_accessor<T>::cache_entry_type;
+ const cache_entry_type cache = cache_accessor<T>::get_cached_power(-minus_k);
+
+ auto xi = cache_accessor<T>::compute_left_endpoint_for_shorter_interval_case(
+ cache, beta);
+ auto zi = cache_accessor<T>::compute_right_endpoint_for_shorter_interval_case(
+ cache, beta);
+
+ // If the left endpoint is not an integer, increase it
+ if (!is_left_endpoint_integer_shorter_interval<T>(exponent)) ++xi;
+
+ // Try bigger divisor
+ ret_value.significand = zi / 10;
+
+ // If succeed, remove trailing zeros if necessary and return
+ if (ret_value.significand * 10 >= xi) {
+ ret_value.exponent = minus_k + 1;
+ ret_value.exponent += remove_trailing_zeros(ret_value.significand);
+ return ret_value;
+ }
+
+ // Otherwise, compute the round-up of y
+ ret_value.significand =
+ cache_accessor<T>::compute_round_up_for_shorter_interval_case(cache,
+ beta);
+ ret_value.exponent = minus_k;
+
+ // When tie occurs, choose one of them according to the rule
+ if (exponent >= float_info<T>::shorter_interval_tie_lower_threshold &&
+ exponent <= float_info<T>::shorter_interval_tie_upper_threshold) {
+ ret_value.significand = ret_value.significand % 2 == 0
+ ? ret_value.significand
+ : ret_value.significand - 1;
+ } else if (ret_value.significand < xi) {
+ ++ret_value.significand;
+ }
+ return ret_value;
+}
+
+template <typename T> auto to_decimal(T x) noexcept -> decimal_fp<T> {
+ // Step 1: integer promotion & Schubfach multiplier calculation.
+
+ using carrier_uint = typename float_info<T>::carrier_uint;
+ using cache_entry_type = typename cache_accessor<T>::cache_entry_type;
+ auto br = bit_cast<carrier_uint>(x);
+
+ // Extract significand bits and exponent bits.
+ const carrier_uint significand_mask =
+ (static_cast<carrier_uint>(1) << num_significand_bits<T>()) - 1;
+ carrier_uint significand = (br & significand_mask);
+ int exponent =
+ static_cast<int>((br & exponent_mask<T>()) >> num_significand_bits<T>());
+
+ if (exponent != 0) { // Check if normal.
+ exponent -= exponent_bias<T>() + num_significand_bits<T>();
+
+ // Shorter interval case; proceed like Schubfach.
+ // In fact, when exponent == 1 and significand == 0, the interval is
+ // regular. However, it can be shown that the end-results are anyway same.
+ if (significand == 0) return shorter_interval_case<T>(exponent);
+
+ significand |= (static_cast<carrier_uint>(1) << num_significand_bits<T>());
+ } else {
+ // Subnormal case; the interval is always regular.
+ if (significand == 0) return {0, 0};
+ exponent =
+ std::numeric_limits<T>::min_exponent - num_significand_bits<T>() - 1;
+ }
+
+ const bool include_left_endpoint = (significand % 2 == 0);
+ const bool include_right_endpoint = include_left_endpoint;
+
+ // Compute k and beta.
+ const int minus_k = floor_log10_pow2(exponent) - float_info<T>::kappa;
+ const cache_entry_type cache = cache_accessor<T>::get_cached_power(-minus_k);
+ const int beta = exponent + floor_log2_pow10(-minus_k);
+
+ // Compute zi and deltai.
+ // 10^kappa <= deltai < 10^(kappa + 1)
+ const uint32_t deltai = cache_accessor<T>::compute_delta(cache, beta);
+ const carrier_uint two_fc = significand << 1;
+
+ // For the case of binary32, the result of integer check is not correct for
+ // 29711844 * 2^-82
+ // = 6.1442653300000000008655037797566933477355632930994033813476... * 10^-18
+ // and 29711844 * 2^-81
+ // = 1.2288530660000000001731007559513386695471126586198806762695... * 10^-17,
+ // and they are the unique counterexamples. However, since 29711844 is even,
+ // this does not cause any problem for the endpoints calculations; it can only
+ // cause a problem when we need to perform integer check for the center.
+ // Fortunately, with these inputs, that branch is never executed, so we are
+ // fine.
+ const typename cache_accessor<T>::compute_mul_result z_mul =
+ cache_accessor<T>::compute_mul((two_fc | 1) << beta, cache);
+
+ // Step 2: Try larger divisor; remove trailing zeros if necessary.
+
+ // Using an upper bound on zi, we might be able to optimize the division
+ // better than the compiler; we are computing zi / big_divisor here.
+ decimal_fp<T> ret_value;
+ ret_value.significand = divide_by_10_to_kappa_plus_1(z_mul.result);
+ uint32_t r = static_cast<uint32_t>(z_mul.result - float_info<T>::big_divisor *
+ ret_value.significand);
+
+ if (r < deltai) {
+ // Exclude the right endpoint if necessary.
+ if (r == 0 && (z_mul.is_integer & !include_right_endpoint)) {
+ --ret_value.significand;
+ r = float_info<T>::big_divisor;
+ goto small_divisor_case_label;
+ }
+ } else if (r > deltai) {
+ goto small_divisor_case_label;
+ } else {
+ // r == deltai; compare fractional parts.
+ const typename cache_accessor<T>::compute_mul_parity_result x_mul =
+ cache_accessor<T>::compute_mul_parity(two_fc - 1, cache, beta);
+
+ if (!(x_mul.parity | (x_mul.is_integer & include_left_endpoint)))
+ goto small_divisor_case_label;
+ }
+ ret_value.exponent = minus_k + float_info<T>::kappa + 1;
+
+ // We may need to remove trailing zeros.
+ ret_value.exponent += remove_trailing_zeros(ret_value.significand);
+ return ret_value;
+
+ // Step 3: Find the significand with the smaller divisor.
+
+small_divisor_case_label:
+ ret_value.significand *= 10;
+ ret_value.exponent = minus_k + float_info<T>::kappa;
+
+ uint32_t dist = r - (deltai / 2) + (float_info<T>::small_divisor / 2);
+ const bool approx_y_parity =
+ ((dist ^ (float_info<T>::small_divisor / 2)) & 1) != 0;
+
+ // Is dist divisible by 10^kappa?
+ const bool divisible_by_small_divisor =
+ check_divisibility_and_divide_by_pow10<float_info<T>::kappa>(dist);
+
+ // Add dist / 10^kappa to the significand.
+ ret_value.significand += dist;
+
+ if (!divisible_by_small_divisor) return ret_value;
+
+ // Check z^(f) >= epsilon^(f).
+ // We have either yi == zi - epsiloni or yi == (zi - epsiloni) - 1,
+ // where yi == zi - epsiloni if and only if z^(f) >= epsilon^(f).
+ // Since there are only 2 possibilities, we only need to care about the
+ // parity. Also, zi and r should have the same parity since the divisor
+ // is an even number.
+ const auto y_mul = cache_accessor<T>::compute_mul_parity(two_fc, cache, beta);
+
+ // If z^(f) >= epsilon^(f), we might have a tie when z^(f) == epsilon^(f),
+ // or equivalently, when y is an integer.
+ if (y_mul.parity != approx_y_parity)
+ --ret_value.significand;
+ else if (y_mul.is_integer & (ret_value.significand % 2 != 0))
+ --ret_value.significand;
+ return ret_value;
+}
+} // namespace dragonbox
+} // namespace detail
+
+template <> struct formatter<detail::bigint> {
+ FMT_CONSTEXPR auto parse(format_parse_context& ctx)
+ -> format_parse_context::iterator {
+ return ctx.begin();
+ }
+
+ auto format(const detail::bigint& n, format_context& ctx) const
+ -> format_context::iterator {
+ auto out = ctx.out();
+ bool first = true;
+ for (auto i = n.bigits_.size(); i > 0; --i) {
+ auto value = n.bigits_[i - 1u];
+ if (first) {
+ out = fmt::format_to(out, FMT_STRING("{:x}"), value);
+ first = false;
+ continue;
+ }
+ out = fmt::format_to(out, FMT_STRING("{:08x}"), value);
+ }
+ if (n.exp_ > 0)
+ out = fmt::format_to(out, FMT_STRING("p{}"),
+ n.exp_ * detail::bigint::bigit_bits);
+ return out;
+ }
+};
+
+FMT_FUNC detail::utf8_to_utf16::utf8_to_utf16(string_view s) {
+ for_each_codepoint(s, [this](uint32_t cp, string_view) {
+ if (cp == invalid_code_point) FMT_THROW(std::runtime_error("invalid utf8"));
+ if (cp <= 0xFFFF) {
+ buffer_.push_back(static_cast<wchar_t>(cp));
+ } else {
+ cp -= 0x10000;
+ buffer_.push_back(static_cast<wchar_t>(0xD800 + (cp >> 10)));
+ buffer_.push_back(static_cast<wchar_t>(0xDC00 + (cp & 0x3FF)));
+ }
+ return true;
+ });
+ buffer_.push_back(0);
+}
+
+FMT_FUNC void format_system_error(detail::buffer<char>& out, int error_code,
+ const char* message) noexcept {
+ FMT_TRY {
+ auto ec = std::error_code(error_code, std::generic_category());
+ write(std::back_inserter(out), std::system_error(ec, message).what());
+ return;
+ }
+ FMT_CATCH(...) {}
+ format_error_code(out, error_code, message);
+}
+
+FMT_FUNC void report_system_error(int error_code,
+ const char* message) noexcept {
+ report_error(format_system_error, error_code, message);
+}
+
+FMT_FUNC auto vformat(string_view fmt, format_args args) -> std::string {
+ // Don't optimize the "{}" case to keep the binary size small and because it
+ // can be better optimized in fmt::format anyway.
+ auto buffer = memory_buffer();
+ detail::vformat_to(buffer, fmt, args);
+ return to_string(buffer);
+}
+
+namespace detail {
+#if !defined(_WIN32) || defined(FMT_WINDOWS_NO_WCHAR)
+FMT_FUNC auto write_console(int, string_view) -> bool { return false; }
+FMT_FUNC auto write_console(std::FILE*, string_view) -> bool { return false; }
+#else
+using dword = conditional_t<sizeof(long) == 4, unsigned long, unsigned>;
+extern "C" __declspec(dllimport) int __stdcall WriteConsoleW( //
+ void*, const void*, dword, dword*, void*);
+
+FMT_FUNC bool write_console(int fd, string_view text) {
+ auto u16 = utf8_to_utf16(text);
+ return WriteConsoleW(reinterpret_cast<void*>(_get_osfhandle(fd)), u16.c_str(),
+ static_cast<dword>(u16.size()), nullptr, nullptr) != 0;
+}
+
+FMT_FUNC auto write_console(std::FILE* f, string_view text) -> bool {
+ return write_console(_fileno(f), text);
+}
+#endif
+
+#ifdef _WIN32
+// Print assuming legacy (non-Unicode) encoding.
+FMT_FUNC void vprint_mojibake(std::FILE* f, string_view fmt, format_args args) {
+ auto buffer = memory_buffer();
+ detail::vformat_to(buffer, fmt, args);
+ fwrite_fully(buffer.data(), buffer.size(), f);
+}
+#endif
+
+FMT_FUNC void print(std::FILE* f, string_view text) {
+#ifdef _WIN32
+ int fd = _fileno(f);
+ if (_isatty(fd)) {
+ std::fflush(f);
+ if (write_console(fd, text)) return;
+ }
+#endif
+ fwrite_fully(text.data(), text.size(), f);
+}
+} // namespace detail
+
+FMT_FUNC void vprint(std::FILE* f, string_view fmt, format_args args) {
+ auto buffer = memory_buffer();
+ detail::vformat_to(buffer, fmt, args);
+ detail::print(f, {buffer.data(), buffer.size()});
+}
+
+FMT_FUNC void vprint(string_view fmt, format_args args) {
+ vprint(stdout, fmt, args);
+}
+
+namespace detail {
+
+struct singleton {
+ unsigned char upper;
+ unsigned char lower_count;
+};
+
+inline auto is_printable(uint16_t x, const singleton* singletons,
+ size_t singletons_size,
+ const unsigned char* singleton_lowers,
+ const unsigned char* normal, size_t normal_size)
+ -> bool {
+ auto upper = x >> 8;
+ auto lower_start = 0;
+ for (size_t i = 0; i < singletons_size; ++i) {
+ auto s = singletons[i];
+ auto lower_end = lower_start + s.lower_count;
+ if (upper < s.upper) break;
+ if (upper == s.upper) {
+ for (auto j = lower_start; j < lower_end; ++j) {
+ if (singleton_lowers[j] == (x & 0xff)) return false;
+ }
+ }
+ lower_start = lower_end;
+ }
+
+ auto xsigned = static_cast<int>(x);
+ auto current = true;
+ for (size_t i = 0; i < normal_size; ++i) {
+ auto v = static_cast<int>(normal[i]);
+ auto len = (v & 0x80) != 0 ? (v & 0x7f) << 8 | normal[++i] : v;
+ xsigned -= len;
+ if (xsigned < 0) break;
+ current = !current;
+ }
+ return current;
+}
+
+// This code is generated by support/printable.py.
+FMT_FUNC auto is_printable(uint32_t cp) -> bool {
+ static constexpr singleton singletons0[] = {
+ {0x00, 1}, {0x03, 5}, {0x05, 6}, {0x06, 3}, {0x07, 6}, {0x08, 8},
+ {0x09, 17}, {0x0a, 28}, {0x0b, 25}, {0x0c, 20}, {0x0d, 16}, {0x0e, 13},
+ {0x0f, 4}, {0x10, 3}, {0x12, 18}, {0x13, 9}, {0x16, 1}, {0x17, 5},
+ {0x18, 2}, {0x19, 3}, {0x1a, 7}, {0x1c, 2}, {0x1d, 1}, {0x1f, 22},
+ {0x20, 3}, {0x2b, 3}, {0x2c, 2}, {0x2d, 11}, {0x2e, 1}, {0x30, 3},
+ {0x31, 2}, {0x32, 1}, {0xa7, 2}, {0xa9, 2}, {0xaa, 4}, {0xab, 8},
+ {0xfa, 2}, {0xfb, 5}, {0xfd, 4}, {0xfe, 3}, {0xff, 9},
+ };
+ static constexpr unsigned char singletons0_lower[] = {
+ 0xad, 0x78, 0x79, 0x8b, 0x8d, 0xa2, 0x30, 0x57, 0x58, 0x8b, 0x8c, 0x90,
+ 0x1c, 0x1d, 0xdd, 0x0e, 0x0f, 0x4b, 0x4c, 0xfb, 0xfc, 0x2e, 0x2f, 0x3f,
+ 0x5c, 0x5d, 0x5f, 0xb5, 0xe2, 0x84, 0x8d, 0x8e, 0x91, 0x92, 0xa9, 0xb1,
+ 0xba, 0xbb, 0xc5, 0xc6, 0xc9, 0xca, 0xde, 0xe4, 0xe5, 0xff, 0x00, 0x04,
+ 0x11, 0x12, 0x29, 0x31, 0x34, 0x37, 0x3a, 0x3b, 0x3d, 0x49, 0x4a, 0x5d,
+ 0x84, 0x8e, 0x92, 0xa9, 0xb1, 0xb4, 0xba, 0xbb, 0xc6, 0xca, 0xce, 0xcf,
+ 0xe4, 0xe5, 0x00, 0x04, 0x0d, 0x0e, 0x11, 0x12, 0x29, 0x31, 0x34, 0x3a,
+ 0x3b, 0x45, 0x46, 0x49, 0x4a, 0x5e, 0x64, 0x65, 0x84, 0x91, 0x9b, 0x9d,
+ 0xc9, 0xce, 0xcf, 0x0d, 0x11, 0x29, 0x45, 0x49, 0x57, 0x64, 0x65, 0x8d,
+ 0x91, 0xa9, 0xb4, 0xba, 0xbb, 0xc5, 0xc9, 0xdf, 0xe4, 0xe5, 0xf0, 0x0d,
+ 0x11, 0x45, 0x49, 0x64, 0x65, 0x80, 0x84, 0xb2, 0xbc, 0xbe, 0xbf, 0xd5,
+ 0xd7, 0xf0, 0xf1, 0x83, 0x85, 0x8b, 0xa4, 0xa6, 0xbe, 0xbf, 0xc5, 0xc7,
+ 0xce, 0xcf, 0xda, 0xdb, 0x48, 0x98, 0xbd, 0xcd, 0xc6, 0xce, 0xcf, 0x49,
+ 0x4e, 0x4f, 0x57, 0x59, 0x5e, 0x5f, 0x89, 0x8e, 0x8f, 0xb1, 0xb6, 0xb7,
+ 0xbf, 0xc1, 0xc6, 0xc7, 0xd7, 0x11, 0x16, 0x17, 0x5b, 0x5c, 0xf6, 0xf7,
+ 0xfe, 0xff, 0x80, 0x0d, 0x6d, 0x71, 0xde, 0xdf, 0x0e, 0x0f, 0x1f, 0x6e,
+ 0x6f, 0x1c, 0x1d, 0x5f, 0x7d, 0x7e, 0xae, 0xaf, 0xbb, 0xbc, 0xfa, 0x16,
+ 0x17, 0x1e, 0x1f, 0x46, 0x47, 0x4e, 0x4f, 0x58, 0x5a, 0x5c, 0x5e, 0x7e,
+ 0x7f, 0xb5, 0xc5, 0xd4, 0xd5, 0xdc, 0xf0, 0xf1, 0xf5, 0x72, 0x73, 0x8f,
+ 0x74, 0x75, 0x96, 0x2f, 0x5f, 0x26, 0x2e, 0x2f, 0xa7, 0xaf, 0xb7, 0xbf,
+ 0xc7, 0xcf, 0xd7, 0xdf, 0x9a, 0x40, 0x97, 0x98, 0x30, 0x8f, 0x1f, 0xc0,
+ 0xc1, 0xce, 0xff, 0x4e, 0x4f, 0x5a, 0x5b, 0x07, 0x08, 0x0f, 0x10, 0x27,
+ 0x2f, 0xee, 0xef, 0x6e, 0x6f, 0x37, 0x3d, 0x3f, 0x42, 0x45, 0x90, 0x91,
+ 0xfe, 0xff, 0x53, 0x67, 0x75, 0xc8, 0xc9, 0xd0, 0xd1, 0xd8, 0xd9, 0xe7,
+ 0xfe, 0xff,
+ };
+ static constexpr singleton singletons1[] = {
+ {0x00, 6}, {0x01, 1}, {0x03, 1}, {0x04, 2}, {0x08, 8}, {0x09, 2},
+ {0x0a, 5}, {0x0b, 2}, {0x0e, 4}, {0x10, 1}, {0x11, 2}, {0x12, 5},
+ {0x13, 17}, {0x14, 1}, {0x15, 2}, {0x17, 2}, {0x19, 13}, {0x1c, 5},
+ {0x1d, 8}, {0x24, 1}, {0x6a, 3}, {0x6b, 2}, {0xbc, 2}, {0xd1, 2},
+ {0xd4, 12}, {0xd5, 9}, {0xd6, 2}, {0xd7, 2}, {0xda, 1}, {0xe0, 5},
+ {0xe1, 2}, {0xe8, 2}, {0xee, 32}, {0xf0, 4}, {0xf8, 2}, {0xf9, 2},
+ {0xfa, 2}, {0xfb, 1},
+ };
+ static constexpr unsigned char singletons1_lower[] = {
+ 0x0c, 0x27, 0x3b, 0x3e, 0x4e, 0x4f, 0x8f, 0x9e, 0x9e, 0x9f, 0x06, 0x07,
+ 0x09, 0x36, 0x3d, 0x3e, 0x56, 0xf3, 0xd0, 0xd1, 0x04, 0x14, 0x18, 0x36,
+ 0x37, 0x56, 0x57, 0x7f, 0xaa, 0xae, 0xaf, 0xbd, 0x35, 0xe0, 0x12, 0x87,
+ 0x89, 0x8e, 0x9e, 0x04, 0x0d, 0x0e, 0x11, 0x12, 0x29, 0x31, 0x34, 0x3a,
+ 0x45, 0x46, 0x49, 0x4a, 0x4e, 0x4f, 0x64, 0x65, 0x5c, 0xb6, 0xb7, 0x1b,
+ 0x1c, 0x07, 0x08, 0x0a, 0x0b, 0x14, 0x17, 0x36, 0x39, 0x3a, 0xa8, 0xa9,
+ 0xd8, 0xd9, 0x09, 0x37, 0x90, 0x91, 0xa8, 0x07, 0x0a, 0x3b, 0x3e, 0x66,
+ 0x69, 0x8f, 0x92, 0x6f, 0x5f, 0xee, 0xef, 0x5a, 0x62, 0x9a, 0x9b, 0x27,
+ 0x28, 0x55, 0x9d, 0xa0, 0xa1, 0xa3, 0xa4, 0xa7, 0xa8, 0xad, 0xba, 0xbc,
+ 0xc4, 0x06, 0x0b, 0x0c, 0x15, 0x1d, 0x3a, 0x3f, 0x45, 0x51, 0xa6, 0xa7,
+ 0xcc, 0xcd, 0xa0, 0x07, 0x19, 0x1a, 0x22, 0x25, 0x3e, 0x3f, 0xc5, 0xc6,
+ 0x04, 0x20, 0x23, 0x25, 0x26, 0x28, 0x33, 0x38, 0x3a, 0x48, 0x4a, 0x4c,
+ 0x50, 0x53, 0x55, 0x56, 0x58, 0x5a, 0x5c, 0x5e, 0x60, 0x63, 0x65, 0x66,
+ 0x6b, 0x73, 0x78, 0x7d, 0x7f, 0x8a, 0xa4, 0xaa, 0xaf, 0xb0, 0xc0, 0xd0,
+ 0xae, 0xaf, 0x79, 0xcc, 0x6e, 0x6f, 0x93,
+ };
+ static constexpr unsigned char normal0[] = {
+ 0x00, 0x20, 0x5f, 0x22, 0x82, 0xdf, 0x04, 0x82, 0x44, 0x08, 0x1b, 0x04,
+ 0x06, 0x11, 0x81, 0xac, 0x0e, 0x80, 0xab, 0x35, 0x28, 0x0b, 0x80, 0xe0,
+ 0x03, 0x19, 0x08, 0x01, 0x04, 0x2f, 0x04, 0x34, 0x04, 0x07, 0x03, 0x01,
+ 0x07, 0x06, 0x07, 0x11, 0x0a, 0x50, 0x0f, 0x12, 0x07, 0x55, 0x07, 0x03,
+ 0x04, 0x1c, 0x0a, 0x09, 0x03, 0x08, 0x03, 0x07, 0x03, 0x02, 0x03, 0x03,
+ 0x03, 0x0c, 0x04, 0x05, 0x03, 0x0b, 0x06, 0x01, 0x0e, 0x15, 0x05, 0x3a,
+ 0x03, 0x11, 0x07, 0x06, 0x05, 0x10, 0x07, 0x57, 0x07, 0x02, 0x07, 0x15,
+ 0x0d, 0x50, 0x04, 0x43, 0x03, 0x2d, 0x03, 0x01, 0x04, 0x11, 0x06, 0x0f,
+ 0x0c, 0x3a, 0x04, 0x1d, 0x25, 0x5f, 0x20, 0x6d, 0x04, 0x6a, 0x25, 0x80,
+ 0xc8, 0x05, 0x82, 0xb0, 0x03, 0x1a, 0x06, 0x82, 0xfd, 0x03, 0x59, 0x07,
+ 0x15, 0x0b, 0x17, 0x09, 0x14, 0x0c, 0x14, 0x0c, 0x6a, 0x06, 0x0a, 0x06,
+ 0x1a, 0x06, 0x59, 0x07, 0x2b, 0x05, 0x46, 0x0a, 0x2c, 0x04, 0x0c, 0x04,
+ 0x01, 0x03, 0x31, 0x0b, 0x2c, 0x04, 0x1a, 0x06, 0x0b, 0x03, 0x80, 0xac,
+ 0x06, 0x0a, 0x06, 0x21, 0x3f, 0x4c, 0x04, 0x2d, 0x03, 0x74, 0x08, 0x3c,
+ 0x03, 0x0f, 0x03, 0x3c, 0x07, 0x38, 0x08, 0x2b, 0x05, 0x82, 0xff, 0x11,
+ 0x18, 0x08, 0x2f, 0x11, 0x2d, 0x03, 0x20, 0x10, 0x21, 0x0f, 0x80, 0x8c,
+ 0x04, 0x82, 0x97, 0x19, 0x0b, 0x15, 0x88, 0x94, 0x05, 0x2f, 0x05, 0x3b,
+ 0x07, 0x02, 0x0e, 0x18, 0x09, 0x80, 0xb3, 0x2d, 0x74, 0x0c, 0x80, 0xd6,
+ 0x1a, 0x0c, 0x05, 0x80, 0xff, 0x05, 0x80, 0xdf, 0x0c, 0xee, 0x0d, 0x03,
+ 0x84, 0x8d, 0x03, 0x37, 0x09, 0x81, 0x5c, 0x14, 0x80, 0xb8, 0x08, 0x80,
+ 0xcb, 0x2a, 0x38, 0x03, 0x0a, 0x06, 0x38, 0x08, 0x46, 0x08, 0x0c, 0x06,
+ 0x74, 0x0b, 0x1e, 0x03, 0x5a, 0x04, 0x59, 0x09, 0x80, 0x83, 0x18, 0x1c,
+ 0x0a, 0x16, 0x09, 0x4c, 0x04, 0x80, 0x8a, 0x06, 0xab, 0xa4, 0x0c, 0x17,
+ 0x04, 0x31, 0xa1, 0x04, 0x81, 0xda, 0x26, 0x07, 0x0c, 0x05, 0x05, 0x80,
+ 0xa5, 0x11, 0x81, 0x6d, 0x10, 0x78, 0x28, 0x2a, 0x06, 0x4c, 0x04, 0x80,
+ 0x8d, 0x04, 0x80, 0xbe, 0x03, 0x1b, 0x03, 0x0f, 0x0d,
+ };
+ static constexpr unsigned char normal1[] = {
+ 0x5e, 0x22, 0x7b, 0x05, 0x03, 0x04, 0x2d, 0x03, 0x66, 0x03, 0x01, 0x2f,
+ 0x2e, 0x80, 0x82, 0x1d, 0x03, 0x31, 0x0f, 0x1c, 0x04, 0x24, 0x09, 0x1e,
+ 0x05, 0x2b, 0x05, 0x44, 0x04, 0x0e, 0x2a, 0x80, 0xaa, 0x06, 0x24, 0x04,
+ 0x24, 0x04, 0x28, 0x08, 0x34, 0x0b, 0x01, 0x80, 0x90, 0x81, 0x37, 0x09,
+ 0x16, 0x0a, 0x08, 0x80, 0x98, 0x39, 0x03, 0x63, 0x08, 0x09, 0x30, 0x16,
+ 0x05, 0x21, 0x03, 0x1b, 0x05, 0x01, 0x40, 0x38, 0x04, 0x4b, 0x05, 0x2f,
+ 0x04, 0x0a, 0x07, 0x09, 0x07, 0x40, 0x20, 0x27, 0x04, 0x0c, 0x09, 0x36,
+ 0x03, 0x3a, 0x05, 0x1a, 0x07, 0x04, 0x0c, 0x07, 0x50, 0x49, 0x37, 0x33,
+ 0x0d, 0x33, 0x07, 0x2e, 0x08, 0x0a, 0x81, 0x26, 0x52, 0x4e, 0x28, 0x08,
+ 0x2a, 0x56, 0x1c, 0x14, 0x17, 0x09, 0x4e, 0x04, 0x1e, 0x0f, 0x43, 0x0e,
+ 0x19, 0x07, 0x0a, 0x06, 0x48, 0x08, 0x27, 0x09, 0x75, 0x0b, 0x3f, 0x41,
+ 0x2a, 0x06, 0x3b, 0x05, 0x0a, 0x06, 0x51, 0x06, 0x01, 0x05, 0x10, 0x03,
+ 0x05, 0x80, 0x8b, 0x62, 0x1e, 0x48, 0x08, 0x0a, 0x80, 0xa6, 0x5e, 0x22,
+ 0x45, 0x0b, 0x0a, 0x06, 0x0d, 0x13, 0x39, 0x07, 0x0a, 0x36, 0x2c, 0x04,
+ 0x10, 0x80, 0xc0, 0x3c, 0x64, 0x53, 0x0c, 0x48, 0x09, 0x0a, 0x46, 0x45,
+ 0x1b, 0x48, 0x08, 0x53, 0x1d, 0x39, 0x81, 0x07, 0x46, 0x0a, 0x1d, 0x03,
+ 0x47, 0x49, 0x37, 0x03, 0x0e, 0x08, 0x0a, 0x06, 0x39, 0x07, 0x0a, 0x81,
+ 0x36, 0x19, 0x80, 0xb7, 0x01, 0x0f, 0x32, 0x0d, 0x83, 0x9b, 0x66, 0x75,
+ 0x0b, 0x80, 0xc4, 0x8a, 0xbc, 0x84, 0x2f, 0x8f, 0xd1, 0x82, 0x47, 0xa1,
+ 0xb9, 0x82, 0x39, 0x07, 0x2a, 0x04, 0x02, 0x60, 0x26, 0x0a, 0x46, 0x0a,
+ 0x28, 0x05, 0x13, 0x82, 0xb0, 0x5b, 0x65, 0x4b, 0x04, 0x39, 0x07, 0x11,
+ 0x40, 0x05, 0x0b, 0x02, 0x0e, 0x97, 0xf8, 0x08, 0x84, 0xd6, 0x2a, 0x09,
+ 0xa2, 0xf7, 0x81, 0x1f, 0x31, 0x03, 0x11, 0x04, 0x08, 0x81, 0x8c, 0x89,
+ 0x04, 0x6b, 0x05, 0x0d, 0x03, 0x09, 0x07, 0x10, 0x93, 0x60, 0x80, 0xf6,
+ 0x0a, 0x73, 0x08, 0x6e, 0x17, 0x46, 0x80, 0x9a, 0x14, 0x0c, 0x57, 0x09,
+ 0x19, 0x80, 0x87, 0x81, 0x47, 0x03, 0x85, 0x42, 0x0f, 0x15, 0x85, 0x50,
+ 0x2b, 0x80, 0xd5, 0x2d, 0x03, 0x1a, 0x04, 0x02, 0x81, 0x70, 0x3a, 0x05,
+ 0x01, 0x85, 0x00, 0x80, 0xd7, 0x29, 0x4c, 0x04, 0x0a, 0x04, 0x02, 0x83,
+ 0x11, 0x44, 0x4c, 0x3d, 0x80, 0xc2, 0x3c, 0x06, 0x01, 0x04, 0x55, 0x05,
+ 0x1b, 0x34, 0x02, 0x81, 0x0e, 0x2c, 0x04, 0x64, 0x0c, 0x56, 0x0a, 0x80,
+ 0xae, 0x38, 0x1d, 0x0d, 0x2c, 0x04, 0x09, 0x07, 0x02, 0x0e, 0x06, 0x80,
+ 0x9a, 0x83, 0xd8, 0x08, 0x0d, 0x03, 0x0d, 0x03, 0x74, 0x0c, 0x59, 0x07,
+ 0x0c, 0x14, 0x0c, 0x04, 0x38, 0x08, 0x0a, 0x06, 0x28, 0x08, 0x22, 0x4e,
+ 0x81, 0x54, 0x0c, 0x15, 0x03, 0x03, 0x05, 0x07, 0x09, 0x19, 0x07, 0x07,
+ 0x09, 0x03, 0x0d, 0x07, 0x29, 0x80, 0xcb, 0x25, 0x0a, 0x84, 0x06,
+ };
+ auto lower = static_cast<uint16_t>(cp);
+ if (cp < 0x10000) {
+ return is_printable(lower, singletons0,
+ sizeof(singletons0) / sizeof(*singletons0),
+ singletons0_lower, normal0, sizeof(normal0));
+ }
+ if (cp < 0x20000) {
+ return is_printable(lower, singletons1,
+ sizeof(singletons1) / sizeof(*singletons1),
+ singletons1_lower, normal1, sizeof(normal1));
+ }
+ if (0x2a6de <= cp && cp < 0x2a700) return false;
+ if (0x2b735 <= cp && cp < 0x2b740) return false;
+ if (0x2b81e <= cp && cp < 0x2b820) return false;
+ if (0x2cea2 <= cp && cp < 0x2ceb0) return false;
+ if (0x2ebe1 <= cp && cp < 0x2f800) return false;
+ if (0x2fa1e <= cp && cp < 0x30000) return false;
+ if (0x3134b <= cp && cp < 0xe0100) return false;
+ if (0xe01f0 <= cp && cp < 0x110000) return false;
+ return cp < 0x110000;
+}
+
+} // namespace detail
+
+FMT_END_NAMESPACE
+
+#endif // FMT_FORMAT_INL_H_
--- /dev/null
+// Formatting library for C++
+//
+// Copyright (c) 2012 - 2016, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#include "fmt/format-inl.h"
+
+FMT_BEGIN_NAMESPACE
+namespace detail {
+
+template FMT_API auto dragonbox::to_decimal(float x) noexcept
+ -> dragonbox::decimal_fp<float>;
+template FMT_API auto dragonbox::to_decimal(double x) noexcept
+ -> dragonbox::decimal_fp<double>;
+
+#ifndef FMT_STATIC_THOUSANDS_SEPARATOR
+template FMT_API locale_ref::locale_ref(const std::locale& loc);
+template FMT_API auto locale_ref::get<std::locale>() const -> std::locale;
+#endif
+
+// Explicit instantiations for char.
+
+template FMT_API auto thousands_sep_impl(locale_ref)
+ -> thousands_sep_result<char>;
+template FMT_API auto decimal_point_impl(locale_ref) -> char;
+
+template FMT_API void buffer<char>::append(const char*, const char*);
+
+template FMT_API void vformat_to(buffer<char>&, string_view,
+ typename vformat_args<>::type, locale_ref);
+
+// Explicit instantiations for wchar_t.
+
+template FMT_API auto thousands_sep_impl(locale_ref)
+ -> thousands_sep_result<wchar_t>;
+template FMT_API auto decimal_point_impl(locale_ref) -> wchar_t;
+
+template FMT_API void buffer<wchar_t>::append(const wchar_t*, const wchar_t*);
+
+} // namespace detail
+FMT_END_NAMESPACE
--- /dev/null
+/*
+ Formatting library for C++
+
+ Copyright (c) 2012 - present, Victor Zverovich
+
+ Permission is hereby granted, free of charge, to any person obtaining
+ a copy of this software and associated documentation files (the
+ "Software"), to deal in the Software without restriction, including
+ without limitation the rights to use, copy, modify, merge, publish,
+ distribute, sublicense, and/or sell copies of the Software, and to
+ permit persons to whom the Software is furnished to do so, subject to
+ the following conditions:
+
+ The above copyright notice and this permission notice shall be
+ included in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+ --- Optional exception to the license ---
+
+ As an exception, if, as a result of your compiling your source code, portions
+ of this Software are embedded into a machine-executable object form of such
+ source code, you may redistribute such embedded portions in such object form
+ without including the above copyright and permission notices.
+ */
+
+#ifndef FMT_FORMAT_H_
+#define FMT_FORMAT_H_
+
+#include <cmath> // std::signbit
+#include <cstdint> // uint32_t
+#include <cstring> // std::memcpy
+#include <initializer_list> // std::initializer_list
+#include <limits> // std::numeric_limits
+#include <memory> // std::uninitialized_copy
+#include <stdexcept> // std::runtime_error
+#include <system_error> // std::system_error
+
+#ifdef __cpp_lib_bit_cast
+# include <bit> // std::bit_cast
+#endif
+
+#include "core.h"
+
+#if defined __cpp_inline_variables && __cpp_inline_variables >= 201606L
+# define FMT_INLINE_VARIABLE inline
+#else
+# define FMT_INLINE_VARIABLE
+#endif
+
+#if FMT_HAS_CPP17_ATTRIBUTE(fallthrough)
+# define FMT_FALLTHROUGH [[fallthrough]]
+#elif defined(__clang__)
+# define FMT_FALLTHROUGH [[clang::fallthrough]]
+#elif FMT_GCC_VERSION >= 700 && \
+ (!defined(__EDG_VERSION__) || __EDG_VERSION__ >= 520)
+# define FMT_FALLTHROUGH [[gnu::fallthrough]]
+#else
+# define FMT_FALLTHROUGH
+#endif
+
+#ifndef FMT_DEPRECATED
+# if FMT_HAS_CPP14_ATTRIBUTE(deprecated) || FMT_MSC_VERSION >= 1900
+# define FMT_DEPRECATED [[deprecated]]
+# else
+# if (defined(__GNUC__) && !defined(__LCC__)) || defined(__clang__)
+# define FMT_DEPRECATED __attribute__((deprecated))
+# elif FMT_MSC_VERSION
+# define FMT_DEPRECATED __declspec(deprecated)
+# else
+# define FMT_DEPRECATED /* deprecated */
+# endif
+# endif
+#endif
+
+#ifndef FMT_NO_UNIQUE_ADDRESS
+# if FMT_CPLUSPLUS >= 202002L
+# if FMT_HAS_CPP_ATTRIBUTE(no_unique_address)
+# define FMT_NO_UNIQUE_ADDRESS [[no_unique_address]]
+// VS2019 v16.10 and later except clang-cl (https://reviews.llvm.org/D110485)
+# elif (FMT_MSC_VERSION >= 1929) && !FMT_CLANG_VERSION
+# define FMT_NO_UNIQUE_ADDRESS [[msvc::no_unique_address]]
+# endif
+# endif
+#endif
+#ifndef FMT_NO_UNIQUE_ADDRESS
+# define FMT_NO_UNIQUE_ADDRESS
+#endif
+
+// Visibility when compiled as a shared library/object.
+#if defined(FMT_LIB_EXPORT) || defined(FMT_SHARED)
+# define FMT_SO_VISIBILITY(value) FMT_VISIBILITY(value)
+#else
+# define FMT_SO_VISIBILITY(value)
+#endif
+
+#ifdef __has_builtin
+# define FMT_HAS_BUILTIN(x) __has_builtin(x)
+#else
+# define FMT_HAS_BUILTIN(x) 0
+#endif
+
+#if FMT_GCC_VERSION || FMT_CLANG_VERSION
+# define FMT_NOINLINE __attribute__((noinline))
+#else
+# define FMT_NOINLINE
+#endif
+
+#ifndef FMT_THROW
+# if FMT_EXCEPTIONS
+# if FMT_MSC_VERSION || defined(__NVCC__)
+FMT_BEGIN_NAMESPACE
+namespace detail {
+template <typename Exception> inline void do_throw(const Exception& x) {
+ // Silence unreachable code warnings in MSVC and NVCC because these
+ // are nearly impossible to fix in a generic code.
+ volatile bool b = true;
+ if (b) throw x;
+}
+} // namespace detail
+FMT_END_NAMESPACE
+# define FMT_THROW(x) detail::do_throw(x)
+# else
+# define FMT_THROW(x) throw x
+# endif
+# else
+# define FMT_THROW(x) \
+ ::fmt::detail::assert_fail(__FILE__, __LINE__, (x).what())
+# endif
+#endif
+
+#if FMT_EXCEPTIONS
+# define FMT_TRY try
+# define FMT_CATCH(x) catch (x)
+#else
+# define FMT_TRY if (true)
+# define FMT_CATCH(x) if (false)
+#endif
+
+#ifndef FMT_MAYBE_UNUSED
+# if FMT_HAS_CPP17_ATTRIBUTE(maybe_unused)
+# define FMT_MAYBE_UNUSED [[maybe_unused]]
+# else
+# define FMT_MAYBE_UNUSED
+# endif
+#endif
+
+#ifndef FMT_USE_USER_DEFINED_LITERALS
+// EDG based compilers (Intel, NVIDIA, Elbrus, etc), GCC and MSVC support UDLs.
+//
+// GCC before 4.9 requires a space in `operator"" _a` which is invalid in later
+// compiler versions.
+# if (FMT_HAS_FEATURE(cxx_user_literals) || FMT_GCC_VERSION >= 409 || \
+ FMT_MSC_VERSION >= 1900) && \
+ (!defined(__EDG_VERSION__) || __EDG_VERSION__ >= /* UDL feature */ 480)
+# define FMT_USE_USER_DEFINED_LITERALS 1
+# else
+# define FMT_USE_USER_DEFINED_LITERALS 0
+# endif
+#endif
+
+// Defining FMT_REDUCE_INT_INSTANTIATIONS to 1, will reduce the number of
+// integer formatter template instantiations to just one by only using the
+// largest integer type. This results in a reduction in binary size but will
+// cause a decrease in integer formatting performance.
+#if !defined(FMT_REDUCE_INT_INSTANTIATIONS)
+# define FMT_REDUCE_INT_INSTANTIATIONS 0
+#endif
+
+// __builtin_clz is broken in clang with Microsoft CodeGen:
+// https://github.com/fmtlib/fmt/issues/519.
+#if !FMT_MSC_VERSION
+# if FMT_HAS_BUILTIN(__builtin_clz) || FMT_GCC_VERSION || FMT_ICC_VERSION
+# define FMT_BUILTIN_CLZ(n) __builtin_clz(n)
+# endif
+# if FMT_HAS_BUILTIN(__builtin_clzll) || FMT_GCC_VERSION || FMT_ICC_VERSION
+# define FMT_BUILTIN_CLZLL(n) __builtin_clzll(n)
+# endif
+#endif
+
+// __builtin_ctz is broken in Intel Compiler Classic on Windows:
+// https://github.com/fmtlib/fmt/issues/2510.
+#ifndef __ICL
+# if FMT_HAS_BUILTIN(__builtin_ctz) || FMT_GCC_VERSION || FMT_ICC_VERSION || \
+ defined(__NVCOMPILER)
+# define FMT_BUILTIN_CTZ(n) __builtin_ctz(n)
+# endif
+# if FMT_HAS_BUILTIN(__builtin_ctzll) || FMT_GCC_VERSION || \
+ FMT_ICC_VERSION || defined(__NVCOMPILER)
+# define FMT_BUILTIN_CTZLL(n) __builtin_ctzll(n)
+# endif
+#endif
+
+#if FMT_MSC_VERSION
+# include <intrin.h> // _BitScanReverse[64], _BitScanForward[64], _umul128
+#endif
+
+// Some compilers masquerade as both MSVC and GCC-likes or otherwise support
+// __builtin_clz and __builtin_clzll, so only define FMT_BUILTIN_CLZ using the
+// MSVC intrinsics if the clz and clzll builtins are not available.
+#if FMT_MSC_VERSION && !defined(FMT_BUILTIN_CLZLL) && \
+ !defined(FMT_BUILTIN_CTZLL)
+FMT_BEGIN_NAMESPACE
+namespace detail {
+// Avoid Clang with Microsoft CodeGen's -Wunknown-pragmas warning.
+# if !defined(__clang__)
+# pragma intrinsic(_BitScanForward)
+# pragma intrinsic(_BitScanReverse)
+# if defined(_WIN64)
+# pragma intrinsic(_BitScanForward64)
+# pragma intrinsic(_BitScanReverse64)
+# endif
+# endif
+
+inline auto clz(uint32_t x) -> int {
+ unsigned long r = 0;
+ _BitScanReverse(&r, x);
+ FMT_ASSERT(x != 0, "");
+ // Static analysis complains about using uninitialized data
+ // "r", but the only way that can happen is if "x" is 0,
+ // which the callers guarantee to not happen.
+ FMT_MSC_WARNING(suppress : 6102)
+ return 31 ^ static_cast<int>(r);
+}
+# define FMT_BUILTIN_CLZ(n) detail::clz(n)
+
+inline auto clzll(uint64_t x) -> int {
+ unsigned long r = 0;
+# ifdef _WIN64
+ _BitScanReverse64(&r, x);
+# else
+ // Scan the high 32 bits.
+ if (_BitScanReverse(&r, static_cast<uint32_t>(x >> 32)))
+ return 63 ^ static_cast<int>(r + 32);
+ // Scan the low 32 bits.
+ _BitScanReverse(&r, static_cast<uint32_t>(x));
+# endif
+ FMT_ASSERT(x != 0, "");
+ FMT_MSC_WARNING(suppress : 6102) // Suppress a bogus static analysis warning.
+ return 63 ^ static_cast<int>(r);
+}
+# define FMT_BUILTIN_CLZLL(n) detail::clzll(n)
+
+inline auto ctz(uint32_t x) -> int {
+ unsigned long r = 0;
+ _BitScanForward(&r, x);
+ FMT_ASSERT(x != 0, "");
+ FMT_MSC_WARNING(suppress : 6102) // Suppress a bogus static analysis warning.
+ return static_cast<int>(r);
+}
+# define FMT_BUILTIN_CTZ(n) detail::ctz(n)
+
+inline auto ctzll(uint64_t x) -> int {
+ unsigned long r = 0;
+ FMT_ASSERT(x != 0, "");
+ FMT_MSC_WARNING(suppress : 6102) // Suppress a bogus static analysis warning.
+# ifdef _WIN64
+ _BitScanForward64(&r, x);
+# else
+ // Scan the low 32 bits.
+ if (_BitScanForward(&r, static_cast<uint32_t>(x))) return static_cast<int>(r);
+ // Scan the high 32 bits.
+ _BitScanForward(&r, static_cast<uint32_t>(x >> 32));
+ r += 32;
+# endif
+ return static_cast<int>(r);
+}
+# define FMT_BUILTIN_CTZLL(n) detail::ctzll(n)
+} // namespace detail
+FMT_END_NAMESPACE
+#endif
+
+FMT_BEGIN_NAMESPACE
+namespace detail {
+
+FMT_CONSTEXPR inline void abort_fuzzing_if(bool condition) {
+ ignore_unused(condition);
+#ifdef FMT_FUZZ
+ if (condition) throw std::runtime_error("fuzzing limit reached");
+#endif
+}
+
+template <typename CharT, CharT... C> struct string_literal {
+ static constexpr CharT value[sizeof...(C)] = {C...};
+ constexpr operator basic_string_view<CharT>() const {
+ return {value, sizeof...(C)};
+ }
+};
+
+#if FMT_CPLUSPLUS < 201703L
+template <typename CharT, CharT... C>
+constexpr CharT string_literal<CharT, C...>::value[sizeof...(C)];
+#endif
+
+// Implementation of std::bit_cast for pre-C++20.
+template <typename To, typename From, FMT_ENABLE_IF(sizeof(To) == sizeof(From))>
+FMT_CONSTEXPR20 auto bit_cast(const From& from) -> To {
+#ifdef __cpp_lib_bit_cast
+ if (is_constant_evaluated()) return std::bit_cast<To>(from);
+#endif
+ auto to = To();
+ // The cast suppresses a bogus -Wclass-memaccess on GCC.
+ std::memcpy(static_cast<void*>(&to), &from, sizeof(to));
+ return to;
+}
+
+inline auto is_big_endian() -> bool {
+#ifdef _WIN32
+ return false;
+#elif defined(__BIG_ENDIAN__)
+ return true;
+#elif defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__)
+ return __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__;
+#else
+ struct bytes {
+ char data[sizeof(int)];
+ };
+ return bit_cast<bytes>(1).data[0] == 0;
+#endif
+}
+
+class uint128_fallback {
+ private:
+ uint64_t lo_, hi_;
+
+ public:
+ constexpr uint128_fallback(uint64_t hi, uint64_t lo) : lo_(lo), hi_(hi) {}
+ constexpr uint128_fallback(uint64_t value = 0) : lo_(value), hi_(0) {}
+
+ constexpr auto high() const noexcept -> uint64_t { return hi_; }
+ constexpr auto low() const noexcept -> uint64_t { return lo_; }
+
+ template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)>
+ constexpr explicit operator T() const {
+ return static_cast<T>(lo_);
+ }
+
+ friend constexpr auto operator==(const uint128_fallback& lhs,
+ const uint128_fallback& rhs) -> bool {
+ return lhs.hi_ == rhs.hi_ && lhs.lo_ == rhs.lo_;
+ }
+ friend constexpr auto operator!=(const uint128_fallback& lhs,
+ const uint128_fallback& rhs) -> bool {
+ return !(lhs == rhs);
+ }
+ friend constexpr auto operator>(const uint128_fallback& lhs,
+ const uint128_fallback& rhs) -> bool {
+ return lhs.hi_ != rhs.hi_ ? lhs.hi_ > rhs.hi_ : lhs.lo_ > rhs.lo_;
+ }
+ friend constexpr auto operator|(const uint128_fallback& lhs,
+ const uint128_fallback& rhs)
+ -> uint128_fallback {
+ return {lhs.hi_ | rhs.hi_, lhs.lo_ | rhs.lo_};
+ }
+ friend constexpr auto operator&(const uint128_fallback& lhs,
+ const uint128_fallback& rhs)
+ -> uint128_fallback {
+ return {lhs.hi_ & rhs.hi_, lhs.lo_ & rhs.lo_};
+ }
+ friend constexpr auto operator~(const uint128_fallback& n)
+ -> uint128_fallback {
+ return {~n.hi_, ~n.lo_};
+ }
+ friend auto operator+(const uint128_fallback& lhs,
+ const uint128_fallback& rhs) -> uint128_fallback {
+ auto result = uint128_fallback(lhs);
+ result += rhs;
+ return result;
+ }
+ friend auto operator*(const uint128_fallback& lhs, uint32_t rhs)
+ -> uint128_fallback {
+ FMT_ASSERT(lhs.hi_ == 0, "");
+ uint64_t hi = (lhs.lo_ >> 32) * rhs;
+ uint64_t lo = (lhs.lo_ & ~uint32_t()) * rhs;
+ uint64_t new_lo = (hi << 32) + lo;
+ return {(hi >> 32) + (new_lo < lo ? 1 : 0), new_lo};
+ }
+ friend auto operator-(const uint128_fallback& lhs, uint64_t rhs)
+ -> uint128_fallback {
+ return {lhs.hi_ - (lhs.lo_ < rhs ? 1 : 0), lhs.lo_ - rhs};
+ }
+ FMT_CONSTEXPR auto operator>>(int shift) const -> uint128_fallback {
+ if (shift == 64) return {0, hi_};
+ if (shift > 64) return uint128_fallback(0, hi_) >> (shift - 64);
+ return {hi_ >> shift, (hi_ << (64 - shift)) | (lo_ >> shift)};
+ }
+ FMT_CONSTEXPR auto operator<<(int shift) const -> uint128_fallback {
+ if (shift == 64) return {lo_, 0};
+ if (shift > 64) return uint128_fallback(lo_, 0) << (shift - 64);
+ return {hi_ << shift | (lo_ >> (64 - shift)), (lo_ << shift)};
+ }
+ FMT_CONSTEXPR auto operator>>=(int shift) -> uint128_fallback& {
+ return *this = *this >> shift;
+ }
+ FMT_CONSTEXPR void operator+=(uint128_fallback n) {
+ uint64_t new_lo = lo_ + n.lo_;
+ uint64_t new_hi = hi_ + n.hi_ + (new_lo < lo_ ? 1 : 0);
+ FMT_ASSERT(new_hi >= hi_, "");
+ lo_ = new_lo;
+ hi_ = new_hi;
+ }
+ FMT_CONSTEXPR void operator&=(uint128_fallback n) {
+ lo_ &= n.lo_;
+ hi_ &= n.hi_;
+ }
+
+ FMT_CONSTEXPR20 auto operator+=(uint64_t n) noexcept -> uint128_fallback& {
+ if (is_constant_evaluated()) {
+ lo_ += n;
+ hi_ += (lo_ < n ? 1 : 0);
+ return *this;
+ }
+#if FMT_HAS_BUILTIN(__builtin_addcll) && !defined(__ibmxl__)
+ unsigned long long carry;
+ lo_ = __builtin_addcll(lo_, n, 0, &carry);
+ hi_ += carry;
+#elif FMT_HAS_BUILTIN(__builtin_ia32_addcarryx_u64) && !defined(__ibmxl__)
+ unsigned long long result;
+ auto carry = __builtin_ia32_addcarryx_u64(0, lo_, n, &result);
+ lo_ = result;
+ hi_ += carry;
+#elif defined(_MSC_VER) && defined(_M_X64)
+ auto carry = _addcarry_u64(0, lo_, n, &lo_);
+ _addcarry_u64(carry, hi_, 0, &hi_);
+#else
+ lo_ += n;
+ hi_ += (lo_ < n ? 1 : 0);
+#endif
+ return *this;
+ }
+};
+
+using uint128_t = conditional_t<FMT_USE_INT128, uint128_opt, uint128_fallback>;
+
+#ifdef UINTPTR_MAX
+using uintptr_t = ::uintptr_t;
+#else
+using uintptr_t = uint128_t;
+#endif
+
+// Returns the largest possible value for type T. Same as
+// std::numeric_limits<T>::max() but shorter and not affected by the max macro.
+template <typename T> constexpr auto max_value() -> T {
+ return (std::numeric_limits<T>::max)();
+}
+template <typename T> constexpr auto num_bits() -> int {
+ return std::numeric_limits<T>::digits;
+}
+// std::numeric_limits<T>::digits may return 0 for 128-bit ints.
+template <> constexpr auto num_bits<int128_opt>() -> int { return 128; }
+template <> constexpr auto num_bits<uint128_t>() -> int { return 128; }
+
+// A heterogeneous bit_cast used for converting 96-bit long double to uint128_t
+// and 128-bit pointers to uint128_fallback.
+template <typename To, typename From, FMT_ENABLE_IF(sizeof(To) > sizeof(From))>
+inline auto bit_cast(const From& from) -> To {
+ constexpr auto size = static_cast<int>(sizeof(From) / sizeof(unsigned));
+ struct data_t {
+ unsigned value[static_cast<unsigned>(size)];
+ } data = bit_cast<data_t>(from);
+ auto result = To();
+ if (const_check(is_big_endian())) {
+ for (int i = 0; i < size; ++i)
+ result = (result << num_bits<unsigned>()) | data.value[i];
+ } else {
+ for (int i = size - 1; i >= 0; --i)
+ result = (result << num_bits<unsigned>()) | data.value[i];
+ }
+ return result;
+}
+
+template <typename UInt>
+FMT_CONSTEXPR20 inline auto countl_zero_fallback(UInt n) -> int {
+ int lz = 0;
+ constexpr UInt msb_mask = static_cast<UInt>(1) << (num_bits<UInt>() - 1);
+ for (; (n & msb_mask) == 0; n <<= 1) lz++;
+ return lz;
+}
+
+FMT_CONSTEXPR20 inline auto countl_zero(uint32_t n) -> int {
+#ifdef FMT_BUILTIN_CLZ
+ if (!is_constant_evaluated()) return FMT_BUILTIN_CLZ(n);
+#endif
+ return countl_zero_fallback(n);
+}
+
+FMT_CONSTEXPR20 inline auto countl_zero(uint64_t n) -> int {
+#ifdef FMT_BUILTIN_CLZLL
+ if (!is_constant_evaluated()) return FMT_BUILTIN_CLZLL(n);
+#endif
+ return countl_zero_fallback(n);
+}
+
+FMT_INLINE void assume(bool condition) {
+ (void)condition;
+#if FMT_HAS_BUILTIN(__builtin_assume) && !FMT_ICC_VERSION
+ __builtin_assume(condition);
+#elif FMT_GCC_VERSION
+ if (!condition) __builtin_unreachable();
+#endif
+}
+
+// An approximation of iterator_t for pre-C++20 systems.
+template <typename T>
+using iterator_t = decltype(std::begin(std::declval<T&>()));
+template <typename T> using sentinel_t = decltype(std::end(std::declval<T&>()));
+
+// A workaround for std::string not having mutable data() until C++17.
+template <typename Char>
+inline auto get_data(std::basic_string<Char>& s) -> Char* {
+ return &s[0];
+}
+template <typename Container>
+inline auto get_data(Container& c) -> typename Container::value_type* {
+ return c.data();
+}
+
+// Attempts to reserve space for n extra characters in the output range.
+// Returns a pointer to the reserved range or a reference to it.
+template <typename Container, FMT_ENABLE_IF(is_contiguous<Container>::value)>
+#if FMT_CLANG_VERSION >= 307 && !FMT_ICC_VERSION
+__attribute__((no_sanitize("undefined")))
+#endif
+inline auto
+reserve(std::back_insert_iterator<Container> it, size_t n) ->
+ typename Container::value_type* {
+ Container& c = get_container(it);
+ size_t size = c.size();
+ c.resize(size + n);
+ return get_data(c) + size;
+}
+
+template <typename T>
+inline auto reserve(buffer_appender<T> it, size_t n) -> buffer_appender<T> {
+ buffer<T>& buf = get_container(it);
+ buf.try_reserve(buf.size() + n);
+ return it;
+}
+
+template <typename Iterator>
+constexpr auto reserve(Iterator& it, size_t) -> Iterator& {
+ return it;
+}
+
+template <typename OutputIt>
+using reserve_iterator =
+ remove_reference_t<decltype(reserve(std::declval<OutputIt&>(), 0))>;
+
+template <typename T, typename OutputIt>
+constexpr auto to_pointer(OutputIt, size_t) -> T* {
+ return nullptr;
+}
+template <typename T> auto to_pointer(buffer_appender<T> it, size_t n) -> T* {
+ buffer<T>& buf = get_container(it);
+ auto size = buf.size();
+ if (buf.capacity() < size + n) return nullptr;
+ buf.try_resize(size + n);
+ return buf.data() + size;
+}
+
+template <typename Container, FMT_ENABLE_IF(is_contiguous<Container>::value)>
+inline auto base_iterator(std::back_insert_iterator<Container> it,
+ typename Container::value_type*)
+ -> std::back_insert_iterator<Container> {
+ return it;
+}
+
+template <typename Iterator>
+constexpr auto base_iterator(Iterator, Iterator it) -> Iterator {
+ return it;
+}
+
+// <algorithm> is spectacularly slow to compile in C++20 so use a simple fill_n
+// instead (#1998).
+template <typename OutputIt, typename Size, typename T>
+FMT_CONSTEXPR auto fill_n(OutputIt out, Size count, const T& value)
+ -> OutputIt {
+ for (Size i = 0; i < count; ++i) *out++ = value;
+ return out;
+}
+template <typename T, typename Size>
+FMT_CONSTEXPR20 auto fill_n(T* out, Size count, char value) -> T* {
+ if (is_constant_evaluated()) {
+ return fill_n<T*, Size, T>(out, count, value);
+ }
+ std::memset(out, value, to_unsigned(count));
+ return out + count;
+}
+
+#ifdef __cpp_char8_t
+using char8_type = char8_t;
+#else
+enum char8_type : unsigned char {};
+#endif
+
+template <typename OutChar, typename InputIt, typename OutputIt>
+FMT_CONSTEXPR FMT_NOINLINE auto copy_str_noinline(InputIt begin, InputIt end,
+ OutputIt out) -> OutputIt {
+ return copy_str<OutChar>(begin, end, out);
+}
+
+// A public domain branchless UTF-8 decoder by Christopher Wellons:
+// https://github.com/skeeto/branchless-utf8
+/* Decode the next character, c, from s, reporting errors in e.
+ *
+ * Since this is a branchless decoder, four bytes will be read from the
+ * buffer regardless of the actual length of the next character. This
+ * means the buffer _must_ have at least three bytes of zero padding
+ * following the end of the data stream.
+ *
+ * Errors are reported in e, which will be non-zero if the parsed
+ * character was somehow invalid: invalid byte sequence, non-canonical
+ * encoding, or a surrogate half.
+ *
+ * The function returns a pointer to the next character. When an error
+ * occurs, this pointer will be a guess that depends on the particular
+ * error, but it will always advance at least one byte.
+ */
+FMT_CONSTEXPR inline auto utf8_decode(const char* s, uint32_t* c, int* e)
+ -> const char* {
+ constexpr const int masks[] = {0x00, 0x7f, 0x1f, 0x0f, 0x07};
+ constexpr const uint32_t mins[] = {4194304, 0, 128, 2048, 65536};
+ constexpr const int shiftc[] = {0, 18, 12, 6, 0};
+ constexpr const int shifte[] = {0, 6, 4, 2, 0};
+
+ int len = "\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\0\0\0\0\0\0\0\0\2\2\2\2\3\3\4"
+ [static_cast<unsigned char>(*s) >> 3];
+ // Compute the pointer to the next character early so that the next
+ // iteration can start working on the next character. Neither Clang
+ // nor GCC figure out this reordering on their own.
+ const char* next = s + len + !len;
+
+ using uchar = unsigned char;
+
+ // Assume a four-byte character and load four bytes. Unused bits are
+ // shifted out.
+ *c = uint32_t(uchar(s[0]) & masks[len]) << 18;
+ *c |= uint32_t(uchar(s[1]) & 0x3f) << 12;
+ *c |= uint32_t(uchar(s[2]) & 0x3f) << 6;
+ *c |= uint32_t(uchar(s[3]) & 0x3f) << 0;
+ *c >>= shiftc[len];
+
+ // Accumulate the various error conditions.
+ *e = (*c < mins[len]) << 6; // non-canonical encoding
+ *e |= ((*c >> 11) == 0x1b) << 7; // surrogate half?
+ *e |= (*c > 0x10FFFF) << 8; // out of range?
+ *e |= (uchar(s[1]) & 0xc0) >> 2;
+ *e |= (uchar(s[2]) & 0xc0) >> 4;
+ *e |= uchar(s[3]) >> 6;
+ *e ^= 0x2a; // top two bits of each tail byte correct?
+ *e >>= shifte[len];
+
+ return next;
+}
+
+constexpr FMT_INLINE_VARIABLE uint32_t invalid_code_point = ~uint32_t();
+
+// Invokes f(cp, sv) for every code point cp in s with sv being the string view
+// corresponding to the code point. cp is invalid_code_point on error.
+template <typename F>
+FMT_CONSTEXPR void for_each_codepoint(string_view s, F f) {
+ auto decode = [f](const char* buf_ptr, const char* ptr) {
+ auto cp = uint32_t();
+ auto error = 0;
+ auto end = utf8_decode(buf_ptr, &cp, &error);
+ bool result = f(error ? invalid_code_point : cp,
+ string_view(ptr, error ? 1 : to_unsigned(end - buf_ptr)));
+ return result ? (error ? buf_ptr + 1 : end) : nullptr;
+ };
+ auto p = s.data();
+ const size_t block_size = 4; // utf8_decode always reads blocks of 4 chars.
+ if (s.size() >= block_size) {
+ for (auto end = p + s.size() - block_size + 1; p < end;) {
+ p = decode(p, p);
+ if (!p) return;
+ }
+ }
+ if (auto num_chars_left = s.data() + s.size() - p) {
+ char buf[2 * block_size - 1] = {};
+ copy_str<char>(p, p + num_chars_left, buf);
+ const char* buf_ptr = buf;
+ do {
+ auto end = decode(buf_ptr, p);
+ if (!end) return;
+ p += end - buf_ptr;
+ buf_ptr = end;
+ } while (buf_ptr - buf < num_chars_left);
+ }
+}
+
+template <typename Char>
+inline auto compute_width(basic_string_view<Char> s) -> size_t {
+ return s.size();
+}
+
+// Computes approximate display width of a UTF-8 string.
+FMT_CONSTEXPR inline auto compute_width(string_view s) -> size_t {
+ size_t num_code_points = 0;
+ // It is not a lambda for compatibility with C++14.
+ struct count_code_points {
+ size_t* count;
+ FMT_CONSTEXPR auto operator()(uint32_t cp, string_view) const -> bool {
+ *count += detail::to_unsigned(
+ 1 +
+ (cp >= 0x1100 &&
+ (cp <= 0x115f || // Hangul Jamo init. consonants
+ cp == 0x2329 || // LEFT-POINTING ANGLE BRACKET
+ cp == 0x232a || // RIGHT-POINTING ANGLE BRACKET
+ // CJK ... Yi except IDEOGRAPHIC HALF FILL SPACE:
+ (cp >= 0x2e80 && cp <= 0xa4cf && cp != 0x303f) ||
+ (cp >= 0xac00 && cp <= 0xd7a3) || // Hangul Syllables
+ (cp >= 0xf900 && cp <= 0xfaff) || // CJK Compatibility Ideographs
+ (cp >= 0xfe10 && cp <= 0xfe19) || // Vertical Forms
+ (cp >= 0xfe30 && cp <= 0xfe6f) || // CJK Compatibility Forms
+ (cp >= 0xff00 && cp <= 0xff60) || // Fullwidth Forms
+ (cp >= 0xffe0 && cp <= 0xffe6) || // Fullwidth Forms
+ (cp >= 0x20000 && cp <= 0x2fffd) || // CJK
+ (cp >= 0x30000 && cp <= 0x3fffd) ||
+ // Miscellaneous Symbols and Pictographs + Emoticons:
+ (cp >= 0x1f300 && cp <= 0x1f64f) ||
+ // Supplemental Symbols and Pictographs:
+ (cp >= 0x1f900 && cp <= 0x1f9ff))));
+ return true;
+ }
+ };
+ // We could avoid branches by using utf8_decode directly.
+ for_each_codepoint(s, count_code_points{&num_code_points});
+ return num_code_points;
+}
+
+inline auto compute_width(basic_string_view<char8_type> s) -> size_t {
+ return compute_width(
+ string_view(reinterpret_cast<const char*>(s.data()), s.size()));
+}
+
+template <typename Char>
+inline auto code_point_index(basic_string_view<Char> s, size_t n) -> size_t {
+ size_t size = s.size();
+ return n < size ? n : size;
+}
+
+// Calculates the index of the nth code point in a UTF-8 string.
+inline auto code_point_index(string_view s, size_t n) -> size_t {
+ size_t result = s.size();
+ const char* begin = s.begin();
+ for_each_codepoint(s, [begin, &n, &result](uint32_t, string_view sv) {
+ if (n != 0) {
+ --n;
+ return true;
+ }
+ result = to_unsigned(sv.begin() - begin);
+ return false;
+ });
+ return result;
+}
+
+inline auto code_point_index(basic_string_view<char8_type> s, size_t n)
+ -> size_t {
+ return code_point_index(
+ string_view(reinterpret_cast<const char*>(s.data()), s.size()), n);
+}
+
+template <typename T> struct is_integral : std::is_integral<T> {};
+template <> struct is_integral<int128_opt> : std::true_type {};
+template <> struct is_integral<uint128_t> : std::true_type {};
+
+template <typename T>
+using is_signed =
+ std::integral_constant<bool, std::numeric_limits<T>::is_signed ||
+ std::is_same<T, int128_opt>::value>;
+
+template <typename T>
+using is_integer =
+ bool_constant<is_integral<T>::value && !std::is_same<T, bool>::value &&
+ !std::is_same<T, char>::value &&
+ !std::is_same<T, wchar_t>::value>;
+
+#ifndef FMT_USE_FLOAT
+# define FMT_USE_FLOAT 1
+#endif
+#ifndef FMT_USE_DOUBLE
+# define FMT_USE_DOUBLE 1
+#endif
+#ifndef FMT_USE_LONG_DOUBLE
+# define FMT_USE_LONG_DOUBLE 1
+#endif
+
+#ifndef FMT_USE_FLOAT128
+# ifdef __clang__
+// Clang emulates GCC, so it has to appear early.
+# if FMT_HAS_INCLUDE(<quadmath.h>)
+# define FMT_USE_FLOAT128 1
+# endif
+# elif defined(__GNUC__)
+// GNU C++:
+# if defined(_GLIBCXX_USE_FLOAT128) && !defined(__STRICT_ANSI__)
+# define FMT_USE_FLOAT128 1
+# endif
+# endif
+# ifndef FMT_USE_FLOAT128
+# define FMT_USE_FLOAT128 0
+# endif
+#endif
+
+#if FMT_USE_FLOAT128
+using float128 = __float128;
+#else
+using float128 = void;
+#endif
+template <typename T> using is_float128 = std::is_same<T, float128>;
+
+template <typename T>
+using is_floating_point =
+ bool_constant<std::is_floating_point<T>::value || is_float128<T>::value>;
+
+template <typename T, bool = std::is_floating_point<T>::value>
+struct is_fast_float : bool_constant<std::numeric_limits<T>::is_iec559 &&
+ sizeof(T) <= sizeof(double)> {};
+template <typename T> struct is_fast_float<T, false> : std::false_type {};
+
+template <typename T>
+using is_double_double = bool_constant<std::numeric_limits<T>::digits == 106>;
+
+#ifndef FMT_USE_FULL_CACHE_DRAGONBOX
+# define FMT_USE_FULL_CACHE_DRAGONBOX 0
+#endif
+
+template <typename T>
+template <typename U>
+void buffer<T>::append(const U* begin, const U* end) {
+ while (begin != end) {
+ auto count = to_unsigned(end - begin);
+ try_reserve(size_ + count);
+ auto free_cap = capacity_ - size_;
+ if (free_cap < count) count = free_cap;
+ std::uninitialized_copy_n(begin, count, ptr_ + size_);
+ size_ += count;
+ begin += count;
+ }
+}
+
+template <typename T, typename Enable = void>
+struct is_locale : std::false_type {};
+template <typename T>
+struct is_locale<T, void_t<decltype(T::classic())>> : std::true_type {};
+} // namespace detail
+
+FMT_BEGIN_EXPORT
+
+// The number of characters to store in the basic_memory_buffer object itself
+// to avoid dynamic memory allocation.
+enum { inline_buffer_size = 500 };
+
+/**
+ \rst
+ A dynamically growing memory buffer for trivially copyable/constructible types
+ with the first ``SIZE`` elements stored in the object itself.
+
+ You can use the ``memory_buffer`` type alias for ``char`` instead.
+
+ **Example**::
+
+ auto out = fmt::memory_buffer();
+ fmt::format_to(std::back_inserter(out), "The answer is {}.", 42);
+
+ This will append the following output to the ``out`` object:
+
+ .. code-block:: none
+
+ The answer is 42.
+
+ The output can be converted to an ``std::string`` with ``to_string(out)``.
+ \endrst
+ */
+template <typename T, size_t SIZE = inline_buffer_size,
+ typename Allocator = std::allocator<T>>
+class basic_memory_buffer final : public detail::buffer<T> {
+ private:
+ T store_[SIZE];
+
+ // Don't inherit from Allocator to avoid generating type_info for it.
+ FMT_NO_UNIQUE_ADDRESS Allocator alloc_;
+
+ // Deallocate memory allocated by the buffer.
+ FMT_CONSTEXPR20 void deallocate() {
+ T* data = this->data();
+ if (data != store_) alloc_.deallocate(data, this->capacity());
+ }
+
+ protected:
+ FMT_CONSTEXPR20 void grow(size_t size) override {
+ detail::abort_fuzzing_if(size > 5000);
+ const size_t max_size = std::allocator_traits<Allocator>::max_size(alloc_);
+ size_t old_capacity = this->capacity();
+ size_t new_capacity = old_capacity + old_capacity / 2;
+ if (size > new_capacity)
+ new_capacity = size;
+ else if (new_capacity > max_size)
+ new_capacity = size > max_size ? size : max_size;
+ T* old_data = this->data();
+ T* new_data =
+ std::allocator_traits<Allocator>::allocate(alloc_, new_capacity);
+ // Suppress a bogus -Wstringop-overflow in gcc 13.1 (#3481).
+ detail::assume(this->size() <= new_capacity);
+ // The following code doesn't throw, so the raw pointer above doesn't leak.
+ std::uninitialized_copy_n(old_data, this->size(), new_data);
+ this->set(new_data, new_capacity);
+ // deallocate must not throw according to the standard, but even if it does,
+ // the buffer already uses the new storage and will deallocate it in
+ // destructor.
+ if (old_data != store_) alloc_.deallocate(old_data, old_capacity);
+ }
+
+ public:
+ using value_type = T;
+ using const_reference = const T&;
+
+ FMT_CONSTEXPR20 explicit basic_memory_buffer(
+ const Allocator& alloc = Allocator())
+ : alloc_(alloc) {
+ this->set(store_, SIZE);
+ if (detail::is_constant_evaluated()) detail::fill_n(store_, SIZE, T());
+ }
+ FMT_CONSTEXPR20 ~basic_memory_buffer() { deallocate(); }
+
+ private:
+ // Move data from other to this buffer.
+ FMT_CONSTEXPR20 void move(basic_memory_buffer& other) {
+ alloc_ = std::move(other.alloc_);
+ T* data = other.data();
+ size_t size = other.size(), capacity = other.capacity();
+ if (data == other.store_) {
+ this->set(store_, capacity);
+ detail::copy_str<T>(other.store_, other.store_ + size, store_);
+ } else {
+ this->set(data, capacity);
+ // Set pointer to the inline array so that delete is not called
+ // when deallocating.
+ other.set(other.store_, 0);
+ other.clear();
+ }
+ this->resize(size);
+ }
+
+ public:
+ /**
+ \rst
+ Constructs a :class:`fmt::basic_memory_buffer` object moving the content
+ of the other object to it.
+ \endrst
+ */
+ FMT_CONSTEXPR20 basic_memory_buffer(basic_memory_buffer&& other) noexcept {
+ move(other);
+ }
+
+ /**
+ \rst
+ Moves the content of the other ``basic_memory_buffer`` object to this one.
+ \endrst
+ */
+ auto operator=(basic_memory_buffer&& other) noexcept -> basic_memory_buffer& {
+ FMT_ASSERT(this != &other, "");
+ deallocate();
+ move(other);
+ return *this;
+ }
+
+ // Returns a copy of the allocator associated with this buffer.
+ auto get_allocator() const -> Allocator { return alloc_; }
+
+ /**
+ Resizes the buffer to contain *count* elements. If T is a POD type new
+ elements may not be initialized.
+ */
+ FMT_CONSTEXPR20 void resize(size_t count) { this->try_resize(count); }
+
+ /** Increases the buffer capacity to *new_capacity*. */
+ void reserve(size_t new_capacity) { this->try_reserve(new_capacity); }
+
+ using detail::buffer<T>::append;
+ template <typename ContiguousRange>
+ void append(const ContiguousRange& range) {
+ append(range.data(), range.data() + range.size());
+ }
+};
+
+using memory_buffer = basic_memory_buffer<char>;
+
+template <typename T, size_t SIZE, typename Allocator>
+struct is_contiguous<basic_memory_buffer<T, SIZE, Allocator>> : std::true_type {
+};
+
+FMT_END_EXPORT
+namespace detail {
+FMT_API auto write_console(int fd, string_view text) -> bool;
+FMT_API auto write_console(std::FILE* f, string_view text) -> bool;
+FMT_API void print(std::FILE*, string_view);
+} // namespace detail
+
+FMT_BEGIN_EXPORT
+
+// Suppress a misleading warning in older versions of clang.
+#if FMT_CLANG_VERSION
+# pragma clang diagnostic ignored "-Wweak-vtables"
+#endif
+
+/** An error reported from a formatting function. */
+class FMT_SO_VISIBILITY("default") format_error : public std::runtime_error {
+ public:
+ using std::runtime_error::runtime_error;
+};
+
+namespace detail_exported {
+#if FMT_USE_NONTYPE_TEMPLATE_ARGS
+template <typename Char, size_t N> struct fixed_string {
+ constexpr fixed_string(const Char (&str)[N]) {
+ detail::copy_str<Char, const Char*, Char*>(static_cast<const Char*>(str),
+ str + N, data);
+ }
+ Char data[N] = {};
+};
+#endif
+
+// Converts a compile-time string to basic_string_view.
+template <typename Char, size_t N>
+constexpr auto compile_string_to_view(const Char (&s)[N])
+ -> basic_string_view<Char> {
+ // Remove trailing NUL character if needed. Won't be present if this is used
+ // with a raw character array (i.e. not defined as a string).
+ return {s, N - (std::char_traits<Char>::to_int_type(s[N - 1]) == 0 ? 1 : 0)};
+}
+template <typename Char>
+constexpr auto compile_string_to_view(detail::std_string_view<Char> s)
+ -> basic_string_view<Char> {
+ return {s.data(), s.size()};
+}
+} // namespace detail_exported
+
+class loc_value {
+ private:
+ basic_format_arg<format_context> value_;
+
+ public:
+ template <typename T, FMT_ENABLE_IF(!detail::is_float128<T>::value)>
+ loc_value(T value) : value_(detail::make_arg<format_context>(value)) {}
+
+ template <typename T, FMT_ENABLE_IF(detail::is_float128<T>::value)>
+ loc_value(T) {}
+
+ template <typename Visitor> auto visit(Visitor&& vis) -> decltype(vis(0)) {
+ return visit_format_arg(vis, value_);
+ }
+};
+
+// A locale facet that formats values in UTF-8.
+// It is parameterized on the locale to avoid the heavy <locale> include.
+template <typename Locale> class format_facet : public Locale::facet {
+ private:
+ std::string separator_;
+ std::string grouping_;
+ std::string decimal_point_;
+
+ protected:
+ virtual auto do_put(appender out, loc_value val,
+ const format_specs<>& specs) const -> bool;
+
+ public:
+ static FMT_API typename Locale::id id;
+
+ explicit format_facet(Locale& loc);
+ explicit format_facet(string_view sep = "",
+ std::initializer_list<unsigned char> g = {3},
+ std::string decimal_point = ".")
+ : separator_(sep.data(), sep.size()),
+ grouping_(g.begin(), g.end()),
+ decimal_point_(decimal_point) {}
+
+ auto put(appender out, loc_value val, const format_specs<>& specs) const
+ -> bool {
+ return do_put(out, val, specs);
+ }
+};
+
+namespace detail {
+
+// Returns true if value is negative, false otherwise.
+// Same as `value < 0` but doesn't produce warnings if T is an unsigned type.
+template <typename T, FMT_ENABLE_IF(is_signed<T>::value)>
+constexpr auto is_negative(T value) -> bool {
+ return value < 0;
+}
+template <typename T, FMT_ENABLE_IF(!is_signed<T>::value)>
+constexpr auto is_negative(T) -> bool {
+ return false;
+}
+
+template <typename T>
+FMT_CONSTEXPR auto is_supported_floating_point(T) -> bool {
+ if (std::is_same<T, float>()) return FMT_USE_FLOAT;
+ if (std::is_same<T, double>()) return FMT_USE_DOUBLE;
+ if (std::is_same<T, long double>()) return FMT_USE_LONG_DOUBLE;
+ return true;
+}
+
+// Smallest of uint32_t, uint64_t, uint128_t that is large enough to
+// represent all values of an integral type T.
+template <typename T>
+using uint32_or_64_or_128_t =
+ conditional_t<num_bits<T>() <= 32 && !FMT_REDUCE_INT_INSTANTIATIONS,
+ uint32_t,
+ conditional_t<num_bits<T>() <= 64, uint64_t, uint128_t>>;
+template <typename T>
+using uint64_or_128_t = conditional_t<num_bits<T>() <= 64, uint64_t, uint128_t>;
+
+#define FMT_POWERS_OF_10(factor) \
+ factor * 10, (factor) * 100, (factor) * 1000, (factor) * 10000, \
+ (factor) * 100000, (factor) * 1000000, (factor) * 10000000, \
+ (factor) * 100000000, (factor) * 1000000000
+
+// Converts value in the range [0, 100) to a string.
+constexpr auto digits2(size_t value) -> const char* {
+ // GCC generates slightly better code when value is pointer-size.
+ return &"0001020304050607080910111213141516171819"
+ "2021222324252627282930313233343536373839"
+ "4041424344454647484950515253545556575859"
+ "6061626364656667686970717273747576777879"
+ "8081828384858687888990919293949596979899"[value * 2];
+}
+
+// Sign is a template parameter to workaround a bug in gcc 4.8.
+template <typename Char, typename Sign> constexpr auto sign(Sign s) -> Char {
+#if !FMT_GCC_VERSION || FMT_GCC_VERSION >= 604
+ static_assert(std::is_same<Sign, sign_t>::value, "");
+#endif
+ return static_cast<Char>("\0-+ "[s]);
+}
+
+template <typename T> FMT_CONSTEXPR auto count_digits_fallback(T n) -> int {
+ int count = 1;
+ for (;;) {
+ // Integer division is slow so do it for a group of four digits instead
+ // of for every digit. The idea comes from the talk by Alexandrescu
+ // "Three Optimization Tips for C++". See speed-test for a comparison.
+ if (n < 10) return count;
+ if (n < 100) return count + 1;
+ if (n < 1000) return count + 2;
+ if (n < 10000) return count + 3;
+ n /= 10000u;
+ count += 4;
+ }
+}
+#if FMT_USE_INT128
+FMT_CONSTEXPR inline auto count_digits(uint128_opt n) -> int {
+ return count_digits_fallback(n);
+}
+#endif
+
+#ifdef FMT_BUILTIN_CLZLL
+// It is a separate function rather than a part of count_digits to workaround
+// the lack of static constexpr in constexpr functions.
+inline auto do_count_digits(uint64_t n) -> int {
+ // This has comparable performance to the version by Kendall Willets
+ // (https://github.com/fmtlib/format-benchmark/blob/master/digits10)
+ // but uses smaller tables.
+ // Maps bsr(n) to ceil(log10(pow(2, bsr(n) + 1) - 1)).
+ static constexpr uint8_t bsr2log10[] = {
+ 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5,
+ 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10, 10, 10,
+ 10, 11, 11, 11, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 15, 15,
+ 15, 16, 16, 16, 16, 17, 17, 17, 18, 18, 18, 19, 19, 19, 19, 20};
+ auto t = bsr2log10[FMT_BUILTIN_CLZLL(n | 1) ^ 63];
+ static constexpr const uint64_t zero_or_powers_of_10[] = {
+ 0, 0, FMT_POWERS_OF_10(1U), FMT_POWERS_OF_10(1000000000ULL),
+ 10000000000000000000ULL};
+ return t - (n < zero_or_powers_of_10[t]);
+}
+#endif
+
+// Returns the number of decimal digits in n. Leading zeros are not counted
+// except for n == 0 in which case count_digits returns 1.
+FMT_CONSTEXPR20 inline auto count_digits(uint64_t n) -> int {
+#ifdef FMT_BUILTIN_CLZLL
+ if (!is_constant_evaluated()) {
+ return do_count_digits(n);
+ }
+#endif
+ return count_digits_fallback(n);
+}
+
+// Counts the number of digits in n. BITS = log2(radix).
+template <int BITS, typename UInt>
+FMT_CONSTEXPR auto count_digits(UInt n) -> int {
+#ifdef FMT_BUILTIN_CLZ
+ if (!is_constant_evaluated() && num_bits<UInt>() == 32)
+ return (FMT_BUILTIN_CLZ(static_cast<uint32_t>(n) | 1) ^ 31) / BITS + 1;
+#endif
+ // Lambda avoids unreachable code warnings from NVHPC.
+ return [](UInt m) {
+ int num_digits = 0;
+ do {
+ ++num_digits;
+ } while ((m >>= BITS) != 0);
+ return num_digits;
+ }(n);
+}
+
+#ifdef FMT_BUILTIN_CLZ
+// It is a separate function rather than a part of count_digits to workaround
+// the lack of static constexpr in constexpr functions.
+FMT_INLINE auto do_count_digits(uint32_t n) -> int {
+// An optimization by Kendall Willets from https://bit.ly/3uOIQrB.
+// This increments the upper 32 bits (log10(T) - 1) when >= T is added.
+# define FMT_INC(T) (((sizeof(#T) - 1ull) << 32) - T)
+ static constexpr uint64_t table[] = {
+ FMT_INC(0), FMT_INC(0), FMT_INC(0), // 8
+ FMT_INC(10), FMT_INC(10), FMT_INC(10), // 64
+ FMT_INC(100), FMT_INC(100), FMT_INC(100), // 512
+ FMT_INC(1000), FMT_INC(1000), FMT_INC(1000), // 4096
+ FMT_INC(10000), FMT_INC(10000), FMT_INC(10000), // 32k
+ FMT_INC(100000), FMT_INC(100000), FMT_INC(100000), // 256k
+ FMT_INC(1000000), FMT_INC(1000000), FMT_INC(1000000), // 2048k
+ FMT_INC(10000000), FMT_INC(10000000), FMT_INC(10000000), // 16M
+ FMT_INC(100000000), FMT_INC(100000000), FMT_INC(100000000), // 128M
+ FMT_INC(1000000000), FMT_INC(1000000000), FMT_INC(1000000000), // 1024M
+ FMT_INC(1000000000), FMT_INC(1000000000) // 4B
+ };
+ auto inc = table[FMT_BUILTIN_CLZ(n | 1) ^ 31];
+ return static_cast<int>((n + inc) >> 32);
+}
+#endif
+
+// Optional version of count_digits for better performance on 32-bit platforms.
+FMT_CONSTEXPR20 inline auto count_digits(uint32_t n) -> int {
+#ifdef FMT_BUILTIN_CLZ
+ if (!is_constant_evaluated()) {
+ return do_count_digits(n);
+ }
+#endif
+ return count_digits_fallback(n);
+}
+
+template <typename Int> constexpr auto digits10() noexcept -> int {
+ return std::numeric_limits<Int>::digits10;
+}
+template <> constexpr auto digits10<int128_opt>() noexcept -> int { return 38; }
+template <> constexpr auto digits10<uint128_t>() noexcept -> int { return 38; }
+
+template <typename Char> struct thousands_sep_result {
+ std::string grouping;
+ Char thousands_sep;
+};
+
+template <typename Char>
+FMT_API auto thousands_sep_impl(locale_ref loc) -> thousands_sep_result<Char>;
+template <typename Char>
+inline auto thousands_sep(locale_ref loc) -> thousands_sep_result<Char> {
+ auto result = thousands_sep_impl<char>(loc);
+ return {result.grouping, Char(result.thousands_sep)};
+}
+template <>
+inline auto thousands_sep(locale_ref loc) -> thousands_sep_result<wchar_t> {
+ return thousands_sep_impl<wchar_t>(loc);
+}
+
+template <typename Char>
+FMT_API auto decimal_point_impl(locale_ref loc) -> Char;
+template <typename Char> inline auto decimal_point(locale_ref loc) -> Char {
+ return Char(decimal_point_impl<char>(loc));
+}
+template <> inline auto decimal_point(locale_ref loc) -> wchar_t {
+ return decimal_point_impl<wchar_t>(loc);
+}
+
+// Compares two characters for equality.
+template <typename Char> auto equal2(const Char* lhs, const char* rhs) -> bool {
+ return lhs[0] == Char(rhs[0]) && lhs[1] == Char(rhs[1]);
+}
+inline auto equal2(const char* lhs, const char* rhs) -> bool {
+ return memcmp(lhs, rhs, 2) == 0;
+}
+
+// Copies two characters from src to dst.
+template <typename Char>
+FMT_CONSTEXPR20 FMT_INLINE void copy2(Char* dst, const char* src) {
+ if (!is_constant_evaluated() && sizeof(Char) == sizeof(char)) {
+ memcpy(dst, src, 2);
+ return;
+ }
+ *dst++ = static_cast<Char>(*src++);
+ *dst = static_cast<Char>(*src);
+}
+
+template <typename Iterator> struct format_decimal_result {
+ Iterator begin;
+ Iterator end;
+};
+
+// Formats a decimal unsigned integer value writing into out pointing to a
+// buffer of specified size. The caller must ensure that the buffer is large
+// enough.
+template <typename Char, typename UInt>
+FMT_CONSTEXPR20 auto format_decimal(Char* out, UInt value, int size)
+ -> format_decimal_result<Char*> {
+ FMT_ASSERT(size >= count_digits(value), "invalid digit count");
+ out += size;
+ Char* end = out;
+ while (value >= 100) {
+ // Integer division is slow so do it for a group of two digits instead
+ // of for every digit. The idea comes from the talk by Alexandrescu
+ // "Three Optimization Tips for C++". See speed-test for a comparison.
+ out -= 2;
+ copy2(out, digits2(static_cast<size_t>(value % 100)));
+ value /= 100;
+ }
+ if (value < 10) {
+ *--out = static_cast<Char>('0' + value);
+ return {out, end};
+ }
+ out -= 2;
+ copy2(out, digits2(static_cast<size_t>(value)));
+ return {out, end};
+}
+
+template <typename Char, typename UInt, typename Iterator,
+ FMT_ENABLE_IF(!std::is_pointer<remove_cvref_t<Iterator>>::value)>
+FMT_CONSTEXPR inline auto format_decimal(Iterator out, UInt value, int size)
+ -> format_decimal_result<Iterator> {
+ // Buffer is large enough to hold all digits (digits10 + 1).
+ Char buffer[digits10<UInt>() + 1] = {};
+ auto end = format_decimal(buffer, value, size).end;
+ return {out, detail::copy_str_noinline<Char>(buffer, end, out)};
+}
+
+template <unsigned BASE_BITS, typename Char, typename UInt>
+FMT_CONSTEXPR auto format_uint(Char* buffer, UInt value, int num_digits,
+ bool upper = false) -> Char* {
+ buffer += num_digits;
+ Char* end = buffer;
+ do {
+ const char* digits = upper ? "0123456789ABCDEF" : "0123456789abcdef";
+ unsigned digit = static_cast<unsigned>(value & ((1 << BASE_BITS) - 1));
+ *--buffer = static_cast<Char>(BASE_BITS < 4 ? static_cast<char>('0' + digit)
+ : digits[digit]);
+ } while ((value >>= BASE_BITS) != 0);
+ return end;
+}
+
+template <unsigned BASE_BITS, typename Char, typename It, typename UInt>
+FMT_CONSTEXPR inline auto format_uint(It out, UInt value, int num_digits,
+ bool upper = false) -> It {
+ if (auto ptr = to_pointer<Char>(out, to_unsigned(num_digits))) {
+ format_uint<BASE_BITS>(ptr, value, num_digits, upper);
+ return out;
+ }
+ // Buffer should be large enough to hold all digits (digits / BASE_BITS + 1).
+ char buffer[num_bits<UInt>() / BASE_BITS + 1] = {};
+ format_uint<BASE_BITS>(buffer, value, num_digits, upper);
+ return detail::copy_str_noinline<Char>(buffer, buffer + num_digits, out);
+}
+
+// A converter from UTF-8 to UTF-16.
+class utf8_to_utf16 {
+ private:
+ basic_memory_buffer<wchar_t> buffer_;
+
+ public:
+ FMT_API explicit utf8_to_utf16(string_view s);
+ operator basic_string_view<wchar_t>() const { return {&buffer_[0], size()}; }
+ auto size() const -> size_t { return buffer_.size() - 1; }
+ auto c_str() const -> const wchar_t* { return &buffer_[0]; }
+ auto str() const -> std::wstring { return {&buffer_[0], size()}; }
+};
+
+enum class to_utf8_error_policy { abort, replace };
+
+// A converter from UTF-16/UTF-32 (host endian) to UTF-8.
+template <typename WChar, typename Buffer = memory_buffer> class to_utf8 {
+ private:
+ Buffer buffer_;
+
+ public:
+ to_utf8() {}
+ explicit to_utf8(basic_string_view<WChar> s,
+ to_utf8_error_policy policy = to_utf8_error_policy::abort) {
+ static_assert(sizeof(WChar) == 2 || sizeof(WChar) == 4,
+ "Expect utf16 or utf32");
+ if (!convert(s, policy))
+ FMT_THROW(std::runtime_error(sizeof(WChar) == 2 ? "invalid utf16"
+ : "invalid utf32"));
+ }
+ operator string_view() const { return string_view(&buffer_[0], size()); }
+ auto size() const -> size_t { return buffer_.size() - 1; }
+ auto c_str() const -> const char* { return &buffer_[0]; }
+ auto str() const -> std::string { return std::string(&buffer_[0], size()); }
+
+ // Performs conversion returning a bool instead of throwing exception on
+ // conversion error. This method may still throw in case of memory allocation
+ // error.
+ auto convert(basic_string_view<WChar> s,
+ to_utf8_error_policy policy = to_utf8_error_policy::abort)
+ -> bool {
+ if (!convert(buffer_, s, policy)) return false;
+ buffer_.push_back(0);
+ return true;
+ }
+ static auto convert(Buffer& buf, basic_string_view<WChar> s,
+ to_utf8_error_policy policy = to_utf8_error_policy::abort)
+ -> bool {
+ for (auto p = s.begin(); p != s.end(); ++p) {
+ uint32_t c = static_cast<uint32_t>(*p);
+ if (sizeof(WChar) == 2 && c >= 0xd800 && c <= 0xdfff) {
+ // Handle a surrogate pair.
+ ++p;
+ if (p == s.end() || (c & 0xfc00) != 0xd800 || (*p & 0xfc00) != 0xdc00) {
+ if (policy == to_utf8_error_policy::abort) return false;
+ buf.append(string_view("\xEF\xBF\xBD"));
+ --p;
+ } else {
+ c = (c << 10) + static_cast<uint32_t>(*p) - 0x35fdc00;
+ }
+ } else if (c < 0x80) {
+ buf.push_back(static_cast<char>(c));
+ } else if (c < 0x800) {
+ buf.push_back(static_cast<char>(0xc0 | (c >> 6)));
+ buf.push_back(static_cast<char>(0x80 | (c & 0x3f)));
+ } else if ((c >= 0x800 && c <= 0xd7ff) || (c >= 0xe000 && c <= 0xffff)) {
+ buf.push_back(static_cast<char>(0xe0 | (c >> 12)));
+ buf.push_back(static_cast<char>(0x80 | ((c & 0xfff) >> 6)));
+ buf.push_back(static_cast<char>(0x80 | (c & 0x3f)));
+ } else if (c >= 0x10000 && c <= 0x10ffff) {
+ buf.push_back(static_cast<char>(0xf0 | (c >> 18)));
+ buf.push_back(static_cast<char>(0x80 | ((c & 0x3ffff) >> 12)));
+ buf.push_back(static_cast<char>(0x80 | ((c & 0xfff) >> 6)));
+ buf.push_back(static_cast<char>(0x80 | (c & 0x3f)));
+ } else {
+ return false;
+ }
+ }
+ return true;
+ }
+};
+
+// Computes 128-bit result of multiplication of two 64-bit unsigned integers.
+inline auto umul128(uint64_t x, uint64_t y) noexcept -> uint128_fallback {
+#if FMT_USE_INT128
+ auto p = static_cast<uint128_opt>(x) * static_cast<uint128_opt>(y);
+ return {static_cast<uint64_t>(p >> 64), static_cast<uint64_t>(p)};
+#elif defined(_MSC_VER) && defined(_M_X64)
+ auto hi = uint64_t();
+ auto lo = _umul128(x, y, &hi);
+ return {hi, lo};
+#else
+ const uint64_t mask = static_cast<uint64_t>(max_value<uint32_t>());
+
+ uint64_t a = x >> 32;
+ uint64_t b = x & mask;
+ uint64_t c = y >> 32;
+ uint64_t d = y & mask;
+
+ uint64_t ac = a * c;
+ uint64_t bc = b * c;
+ uint64_t ad = a * d;
+ uint64_t bd = b * d;
+
+ uint64_t intermediate = (bd >> 32) + (ad & mask) + (bc & mask);
+
+ return {ac + (intermediate >> 32) + (ad >> 32) + (bc >> 32),
+ (intermediate << 32) + (bd & mask)};
+#endif
+}
+
+namespace dragonbox {
+// Computes floor(log10(pow(2, e))) for e in [-2620, 2620] using the method from
+// https://fmt.dev/papers/Dragonbox.pdf#page=28, section 6.1.
+inline auto floor_log10_pow2(int e) noexcept -> int {
+ FMT_ASSERT(e <= 2620 && e >= -2620, "too large exponent");
+ static_assert((-1 >> 1) == -1, "right shift is not arithmetic");
+ return (e * 315653) >> 20;
+}
+
+inline auto floor_log2_pow10(int e) noexcept -> int {
+ FMT_ASSERT(e <= 1233 && e >= -1233, "too large exponent");
+ return (e * 1741647) >> 19;
+}
+
+// Computes upper 64 bits of multiplication of two 64-bit unsigned integers.
+inline auto umul128_upper64(uint64_t x, uint64_t y) noexcept -> uint64_t {
+#if FMT_USE_INT128
+ auto p = static_cast<uint128_opt>(x) * static_cast<uint128_opt>(y);
+ return static_cast<uint64_t>(p >> 64);
+#elif defined(_MSC_VER) && defined(_M_X64)
+ return __umulh(x, y);
+#else
+ return umul128(x, y).high();
+#endif
+}
+
+// Computes upper 128 bits of multiplication of a 64-bit unsigned integer and a
+// 128-bit unsigned integer.
+inline auto umul192_upper128(uint64_t x, uint128_fallback y) noexcept
+ -> uint128_fallback {
+ uint128_fallback r = umul128(x, y.high());
+ r += umul128_upper64(x, y.low());
+ return r;
+}
+
+FMT_API auto get_cached_power(int k) noexcept -> uint128_fallback;
+
+// Type-specific information that Dragonbox uses.
+template <typename T, typename Enable = void> struct float_info;
+
+template <> struct float_info<float> {
+ using carrier_uint = uint32_t;
+ static const int exponent_bits = 8;
+ static const int kappa = 1;
+ static const int big_divisor = 100;
+ static const int small_divisor = 10;
+ static const int min_k = -31;
+ static const int max_k = 46;
+ static const int shorter_interval_tie_lower_threshold = -35;
+ static const int shorter_interval_tie_upper_threshold = -35;
+};
+
+template <> struct float_info<double> {
+ using carrier_uint = uint64_t;
+ static const int exponent_bits = 11;
+ static const int kappa = 2;
+ static const int big_divisor = 1000;
+ static const int small_divisor = 100;
+ static const int min_k = -292;
+ static const int max_k = 341;
+ static const int shorter_interval_tie_lower_threshold = -77;
+ static const int shorter_interval_tie_upper_threshold = -77;
+};
+
+// An 80- or 128-bit floating point number.
+template <typename T>
+struct float_info<T, enable_if_t<std::numeric_limits<T>::digits == 64 ||
+ std::numeric_limits<T>::digits == 113 ||
+ is_float128<T>::value>> {
+ using carrier_uint = detail::uint128_t;
+ static const int exponent_bits = 15;
+};
+
+// A double-double floating point number.
+template <typename T>
+struct float_info<T, enable_if_t<is_double_double<T>::value>> {
+ using carrier_uint = detail::uint128_t;
+};
+
+template <typename T> struct decimal_fp {
+ using significand_type = typename float_info<T>::carrier_uint;
+ significand_type significand;
+ int exponent;
+};
+
+template <typename T> FMT_API auto to_decimal(T x) noexcept -> decimal_fp<T>;
+} // namespace dragonbox
+
+// Returns true iff Float has the implicit bit which is not stored.
+template <typename Float> constexpr auto has_implicit_bit() -> bool {
+ // An 80-bit FP number has a 64-bit significand an no implicit bit.
+ return std::numeric_limits<Float>::digits != 64;
+}
+
+// Returns the number of significand bits stored in Float. The implicit bit is
+// not counted since it is not stored.
+template <typename Float> constexpr auto num_significand_bits() -> int {
+ // std::numeric_limits may not support __float128.
+ return is_float128<Float>() ? 112
+ : (std::numeric_limits<Float>::digits -
+ (has_implicit_bit<Float>() ? 1 : 0));
+}
+
+template <typename Float>
+constexpr auto exponent_mask() ->
+ typename dragonbox::float_info<Float>::carrier_uint {
+ using float_uint = typename dragonbox::float_info<Float>::carrier_uint;
+ return ((float_uint(1) << dragonbox::float_info<Float>::exponent_bits) - 1)
+ << num_significand_bits<Float>();
+}
+template <typename Float> constexpr auto exponent_bias() -> int {
+ // std::numeric_limits may not support __float128.
+ return is_float128<Float>() ? 16383
+ : std::numeric_limits<Float>::max_exponent - 1;
+}
+
+// Writes the exponent exp in the form "[+-]d{2,3}" to buffer.
+template <typename Char, typename It>
+FMT_CONSTEXPR auto write_exponent(int exp, It it) -> It {
+ FMT_ASSERT(-10000 < exp && exp < 10000, "exponent out of range");
+ if (exp < 0) {
+ *it++ = static_cast<Char>('-');
+ exp = -exp;
+ } else {
+ *it++ = static_cast<Char>('+');
+ }
+ if (exp >= 100) {
+ const char* top = digits2(to_unsigned(exp / 100));
+ if (exp >= 1000) *it++ = static_cast<Char>(top[0]);
+ *it++ = static_cast<Char>(top[1]);
+ exp %= 100;
+ }
+ const char* d = digits2(to_unsigned(exp));
+ *it++ = static_cast<Char>(d[0]);
+ *it++ = static_cast<Char>(d[1]);
+ return it;
+}
+
+// A floating-point number f * pow(2, e) where F is an unsigned type.
+template <typename F> struct basic_fp {
+ F f;
+ int e;
+
+ static constexpr const int num_significand_bits =
+ static_cast<int>(sizeof(F) * num_bits<unsigned char>());
+
+ constexpr basic_fp() : f(0), e(0) {}
+ constexpr basic_fp(uint64_t f_val, int e_val) : f(f_val), e(e_val) {}
+
+ // Constructs fp from an IEEE754 floating-point number.
+ template <typename Float> FMT_CONSTEXPR basic_fp(Float n) { assign(n); }
+
+ // Assigns n to this and return true iff predecessor is closer than successor.
+ template <typename Float, FMT_ENABLE_IF(!is_double_double<Float>::value)>
+ FMT_CONSTEXPR auto assign(Float n) -> bool {
+ static_assert(std::numeric_limits<Float>::digits <= 113, "unsupported FP");
+ // Assume Float is in the format [sign][exponent][significand].
+ using carrier_uint = typename dragonbox::float_info<Float>::carrier_uint;
+ const auto num_float_significand_bits =
+ detail::num_significand_bits<Float>();
+ const auto implicit_bit = carrier_uint(1) << num_float_significand_bits;
+ const auto significand_mask = implicit_bit - 1;
+ auto u = bit_cast<carrier_uint>(n);
+ f = static_cast<F>(u & significand_mask);
+ auto biased_e = static_cast<int>((u & exponent_mask<Float>()) >>
+ num_float_significand_bits);
+ // The predecessor is closer if n is a normalized power of 2 (f == 0)
+ // other than the smallest normalized number (biased_e > 1).
+ auto is_predecessor_closer = f == 0 && biased_e > 1;
+ if (biased_e == 0)
+ biased_e = 1; // Subnormals use biased exponent 1 (min exponent).
+ else if (has_implicit_bit<Float>())
+ f += static_cast<F>(implicit_bit);
+ e = biased_e - exponent_bias<Float>() - num_float_significand_bits;
+ if (!has_implicit_bit<Float>()) ++e;
+ return is_predecessor_closer;
+ }
+
+ template <typename Float, FMT_ENABLE_IF(is_double_double<Float>::value)>
+ FMT_CONSTEXPR auto assign(Float n) -> bool {
+ static_assert(std::numeric_limits<double>::is_iec559, "unsupported FP");
+ return assign(static_cast<double>(n));
+ }
+};
+
+using fp = basic_fp<unsigned long long>;
+
+// Normalizes the value converted from double and multiplied by (1 << SHIFT).
+template <int SHIFT = 0, typename F>
+FMT_CONSTEXPR auto normalize(basic_fp<F> value) -> basic_fp<F> {
+ // Handle subnormals.
+ const auto implicit_bit = F(1) << num_significand_bits<double>();
+ const auto shifted_implicit_bit = implicit_bit << SHIFT;
+ while ((value.f & shifted_implicit_bit) == 0) {
+ value.f <<= 1;
+ --value.e;
+ }
+ // Subtract 1 to account for hidden bit.
+ const auto offset = basic_fp<F>::num_significand_bits -
+ num_significand_bits<double>() - SHIFT - 1;
+ value.f <<= offset;
+ value.e -= offset;
+ return value;
+}
+
+// Computes lhs * rhs / pow(2, 64) rounded to nearest with half-up tie breaking.
+FMT_CONSTEXPR inline auto multiply(uint64_t lhs, uint64_t rhs) -> uint64_t {
+#if FMT_USE_INT128
+ auto product = static_cast<__uint128_t>(lhs) * rhs;
+ auto f = static_cast<uint64_t>(product >> 64);
+ return (static_cast<uint64_t>(product) & (1ULL << 63)) != 0 ? f + 1 : f;
+#else
+ // Multiply 32-bit parts of significands.
+ uint64_t mask = (1ULL << 32) - 1;
+ uint64_t a = lhs >> 32, b = lhs & mask;
+ uint64_t c = rhs >> 32, d = rhs & mask;
+ uint64_t ac = a * c, bc = b * c, ad = a * d, bd = b * d;
+ // Compute mid 64-bit of result and round.
+ uint64_t mid = (bd >> 32) + (ad & mask) + (bc & mask) + (1U << 31);
+ return ac + (ad >> 32) + (bc >> 32) + (mid >> 32);
+#endif
+}
+
+FMT_CONSTEXPR inline auto operator*(fp x, fp y) -> fp {
+ return {multiply(x.f, y.f), x.e + y.e + 64};
+}
+
+template <typename T, bool doublish = num_bits<T>() == num_bits<double>()>
+using convert_float_result =
+ conditional_t<std::is_same<T, float>::value || doublish, double, T>;
+
+template <typename T>
+constexpr auto convert_float(T value) -> convert_float_result<T> {
+ return static_cast<convert_float_result<T>>(value);
+}
+
+template <typename OutputIt, typename Char>
+FMT_NOINLINE FMT_CONSTEXPR auto fill(OutputIt it, size_t n,
+ const fill_t<Char>& fill) -> OutputIt {
+ auto fill_size = fill.size();
+ if (fill_size == 1) return detail::fill_n(it, n, fill[0]);
+ auto data = fill.data();
+ for (size_t i = 0; i < n; ++i)
+ it = copy_str<Char>(data, data + fill_size, it);
+ return it;
+}
+
+// Writes the output of f, padded according to format specifications in specs.
+// size: output size in code units.
+// width: output display width in (terminal) column positions.
+template <align::type align = align::left, typename OutputIt, typename Char,
+ typename F>
+FMT_CONSTEXPR auto write_padded(OutputIt out, const format_specs<Char>& specs,
+ size_t size, size_t width, F&& f) -> OutputIt {
+ static_assert(align == align::left || align == align::right, "");
+ unsigned spec_width = to_unsigned(specs.width);
+ size_t padding = spec_width > width ? spec_width - width : 0;
+ // Shifts are encoded as string literals because static constexpr is not
+ // supported in constexpr functions.
+ auto* shifts = align == align::left ? "\x1f\x1f\x00\x01" : "\x00\x1f\x00\x01";
+ size_t left_padding = padding >> shifts[specs.align];
+ size_t right_padding = padding - left_padding;
+ auto it = reserve(out, size + padding * specs.fill.size());
+ if (left_padding != 0) it = fill(it, left_padding, specs.fill);
+ it = f(it);
+ if (right_padding != 0) it = fill(it, right_padding, specs.fill);
+ return base_iterator(out, it);
+}
+
+template <align::type align = align::left, typename OutputIt, typename Char,
+ typename F>
+constexpr auto write_padded(OutputIt out, const format_specs<Char>& specs,
+ size_t size, F&& f) -> OutputIt {
+ return write_padded<align>(out, specs, size, size, f);
+}
+
+template <align::type align = align::left, typename Char, typename OutputIt>
+FMT_CONSTEXPR auto write_bytes(OutputIt out, string_view bytes,
+ const format_specs<Char>& specs) -> OutputIt {
+ return write_padded<align>(
+ out, specs, bytes.size(), [bytes](reserve_iterator<OutputIt> it) {
+ const char* data = bytes.data();
+ return copy_str<Char>(data, data + bytes.size(), it);
+ });
+}
+
+template <typename Char, typename OutputIt, typename UIntPtr>
+auto write_ptr(OutputIt out, UIntPtr value, const format_specs<Char>* specs)
+ -> OutputIt {
+ int num_digits = count_digits<4>(value);
+ auto size = to_unsigned(num_digits) + size_t(2);
+ auto write = [=](reserve_iterator<OutputIt> it) {
+ *it++ = static_cast<Char>('0');
+ *it++ = static_cast<Char>('x');
+ return format_uint<4, Char>(it, value, num_digits);
+ };
+ return specs ? write_padded<align::right>(out, *specs, size, write)
+ : base_iterator(out, write(reserve(out, size)));
+}
+
+// Returns true iff the code point cp is printable.
+FMT_API auto is_printable(uint32_t cp) -> bool;
+
+inline auto needs_escape(uint32_t cp) -> bool {
+ return cp < 0x20 || cp == 0x7f || cp == '"' || cp == '\\' ||
+ !is_printable(cp);
+}
+
+template <typename Char> struct find_escape_result {
+ const Char* begin;
+ const Char* end;
+ uint32_t cp;
+};
+
+template <typename Char>
+using make_unsigned_char =
+ typename conditional_t<std::is_integral<Char>::value,
+ std::make_unsigned<Char>,
+ type_identity<uint32_t>>::type;
+
+template <typename Char>
+auto find_escape(const Char* begin, const Char* end)
+ -> find_escape_result<Char> {
+ for (; begin != end; ++begin) {
+ uint32_t cp = static_cast<make_unsigned_char<Char>>(*begin);
+ if (const_check(sizeof(Char) == 1) && cp >= 0x80) continue;
+ if (needs_escape(cp)) return {begin, begin + 1, cp};
+ }
+ return {begin, nullptr, 0};
+}
+
+inline auto find_escape(const char* begin, const char* end)
+ -> find_escape_result<char> {
+ if (!is_utf8()) return find_escape<char>(begin, end);
+ auto result = find_escape_result<char>{end, nullptr, 0};
+ for_each_codepoint(string_view(begin, to_unsigned(end - begin)),
+ [&](uint32_t cp, string_view sv) {
+ if (needs_escape(cp)) {
+ result = {sv.begin(), sv.end(), cp};
+ return false;
+ }
+ return true;
+ });
+ return result;
+}
+
+#define FMT_STRING_IMPL(s, base, explicit) \
+ [] { \
+ /* Use the hidden visibility as a workaround for a GCC bug (#1973). */ \
+ /* Use a macro-like name to avoid shadowing warnings. */ \
+ struct FMT_VISIBILITY("hidden") FMT_COMPILE_STRING : base { \
+ using char_type FMT_MAYBE_UNUSED = fmt::remove_cvref_t<decltype(s[0])>; \
+ FMT_MAYBE_UNUSED FMT_CONSTEXPR explicit \
+ operator fmt::basic_string_view<char_type>() const { \
+ return fmt::detail_exported::compile_string_to_view<char_type>(s); \
+ } \
+ }; \
+ return FMT_COMPILE_STRING(); \
+ }()
+
+/**
+ \rst
+ Constructs a compile-time format string from a string literal *s*.
+
+ **Example**::
+
+ // A compile-time error because 'd' is an invalid specifier for strings.
+ std::string s = fmt::format(FMT_STRING("{:d}"), "foo");
+ \endrst
+ */
+#define FMT_STRING(s) FMT_STRING_IMPL(s, fmt::detail::compile_string, )
+
+template <size_t width, typename Char, typename OutputIt>
+auto write_codepoint(OutputIt out, char prefix, uint32_t cp) -> OutputIt {
+ *out++ = static_cast<Char>('\\');
+ *out++ = static_cast<Char>(prefix);
+ Char buf[width];
+ fill_n(buf, width, static_cast<Char>('0'));
+ format_uint<4>(buf, cp, width);
+ return copy_str<Char>(buf, buf + width, out);
+}
+
+template <typename OutputIt, typename Char>
+auto write_escaped_cp(OutputIt out, const find_escape_result<Char>& escape)
+ -> OutputIt {
+ auto c = static_cast<Char>(escape.cp);
+ switch (escape.cp) {
+ case '\n':
+ *out++ = static_cast<Char>('\\');
+ c = static_cast<Char>('n');
+ break;
+ case '\r':
+ *out++ = static_cast<Char>('\\');
+ c = static_cast<Char>('r');
+ break;
+ case '\t':
+ *out++ = static_cast<Char>('\\');
+ c = static_cast<Char>('t');
+ break;
+ case '"':
+ FMT_FALLTHROUGH;
+ case '\'':
+ FMT_FALLTHROUGH;
+ case '\\':
+ *out++ = static_cast<Char>('\\');
+ break;
+ default:
+ if (escape.cp < 0x100) {
+ return write_codepoint<2, Char>(out, 'x', escape.cp);
+ }
+ if (escape.cp < 0x10000) {
+ return write_codepoint<4, Char>(out, 'u', escape.cp);
+ }
+ if (escape.cp < 0x110000) {
+ return write_codepoint<8, Char>(out, 'U', escape.cp);
+ }
+ for (Char escape_char : basic_string_view<Char>(
+ escape.begin, to_unsigned(escape.end - escape.begin))) {
+ out = write_codepoint<2, Char>(out, 'x',
+ static_cast<uint32_t>(escape_char) & 0xFF);
+ }
+ return out;
+ }
+ *out++ = c;
+ return out;
+}
+
+template <typename Char, typename OutputIt>
+auto write_escaped_string(OutputIt out, basic_string_view<Char> str)
+ -> OutputIt {
+ *out++ = static_cast<Char>('"');
+ auto begin = str.begin(), end = str.end();
+ do {
+ auto escape = find_escape(begin, end);
+ out = copy_str<Char>(begin, escape.begin, out);
+ begin = escape.end;
+ if (!begin) break;
+ out = write_escaped_cp<OutputIt, Char>(out, escape);
+ } while (begin != end);
+ *out++ = static_cast<Char>('"');
+ return out;
+}
+
+template <typename Char, typename OutputIt>
+auto write_escaped_char(OutputIt out, Char v) -> OutputIt {
+ Char v_array[1] = {v};
+ *out++ = static_cast<Char>('\'');
+ if ((needs_escape(static_cast<uint32_t>(v)) && v != static_cast<Char>('"')) ||
+ v == static_cast<Char>('\'')) {
+ out = write_escaped_cp(out,
+ find_escape_result<Char>{v_array, v_array + 1,
+ static_cast<uint32_t>(v)});
+ } else {
+ *out++ = v;
+ }
+ *out++ = static_cast<Char>('\'');
+ return out;
+}
+
+template <typename Char, typename OutputIt>
+FMT_CONSTEXPR auto write_char(OutputIt out, Char value,
+ const format_specs<Char>& specs) -> OutputIt {
+ bool is_debug = specs.type == presentation_type::debug;
+ return write_padded(out, specs, 1, [=](reserve_iterator<OutputIt> it) {
+ if (is_debug) return write_escaped_char(it, value);
+ *it++ = value;
+ return it;
+ });
+}
+template <typename Char, typename OutputIt>
+FMT_CONSTEXPR auto write(OutputIt out, Char value,
+ const format_specs<Char>& specs, locale_ref loc = {})
+ -> OutputIt {
+ // char is formatted as unsigned char for consistency across platforms.
+ using unsigned_type =
+ conditional_t<std::is_same<Char, char>::value, unsigned char, unsigned>;
+ return check_char_specs(specs)
+ ? write_char(out, value, specs)
+ : write(out, static_cast<unsigned_type>(value), specs, loc);
+}
+
+// Data for write_int that doesn't depend on output iterator type. It is used to
+// avoid template code bloat.
+template <typename Char> struct write_int_data {
+ size_t size;
+ size_t padding;
+
+ FMT_CONSTEXPR write_int_data(int num_digits, unsigned prefix,
+ const format_specs<Char>& specs)
+ : size((prefix >> 24) + to_unsigned(num_digits)), padding(0) {
+ if (specs.align == align::numeric) {
+ auto width = to_unsigned(specs.width);
+ if (width > size) {
+ padding = width - size;
+ size = width;
+ }
+ } else if (specs.precision > num_digits) {
+ size = (prefix >> 24) + to_unsigned(specs.precision);
+ padding = to_unsigned(specs.precision - num_digits);
+ }
+ }
+};
+
+// Writes an integer in the format
+// <left-padding><prefix><numeric-padding><digits><right-padding>
+// where <digits> are written by write_digits(it).
+// prefix contains chars in three lower bytes and the size in the fourth byte.
+template <typename OutputIt, typename Char, typename W>
+FMT_CONSTEXPR FMT_INLINE auto write_int(OutputIt out, int num_digits,
+ unsigned prefix,
+ const format_specs<Char>& specs,
+ W write_digits) -> OutputIt {
+ // Slightly faster check for specs.width == 0 && specs.precision == -1.
+ if ((specs.width | (specs.precision + 1)) == 0) {
+ auto it = reserve(out, to_unsigned(num_digits) + (prefix >> 24));
+ if (prefix != 0) {
+ for (unsigned p = prefix & 0xffffff; p != 0; p >>= 8)
+ *it++ = static_cast<Char>(p & 0xff);
+ }
+ return base_iterator(out, write_digits(it));
+ }
+ auto data = write_int_data<Char>(num_digits, prefix, specs);
+ return write_padded<align::right>(
+ out, specs, data.size, [=](reserve_iterator<OutputIt> it) {
+ for (unsigned p = prefix & 0xffffff; p != 0; p >>= 8)
+ *it++ = static_cast<Char>(p & 0xff);
+ it = detail::fill_n(it, data.padding, static_cast<Char>('0'));
+ return write_digits(it);
+ });
+}
+
+template <typename Char> class digit_grouping {
+ private:
+ std::string grouping_;
+ std::basic_string<Char> thousands_sep_;
+
+ struct next_state {
+ std::string::const_iterator group;
+ int pos;
+ };
+ auto initial_state() const -> next_state { return {grouping_.begin(), 0}; }
+
+ // Returns the next digit group separator position.
+ auto next(next_state& state) const -> int {
+ if (thousands_sep_.empty()) return max_value<int>();
+ if (state.group == grouping_.end()) return state.pos += grouping_.back();
+ if (*state.group <= 0 || *state.group == max_value<char>())
+ return max_value<int>();
+ state.pos += *state.group++;
+ return state.pos;
+ }
+
+ public:
+ explicit digit_grouping(locale_ref loc, bool localized = true) {
+ if (!localized) return;
+ auto sep = thousands_sep<Char>(loc);
+ grouping_ = sep.grouping;
+ if (sep.thousands_sep) thousands_sep_.assign(1, sep.thousands_sep);
+ }
+ digit_grouping(std::string grouping, std::basic_string<Char> sep)
+ : grouping_(std::move(grouping)), thousands_sep_(std::move(sep)) {}
+
+ auto has_separator() const -> bool { return !thousands_sep_.empty(); }
+
+ auto count_separators(int num_digits) const -> int {
+ int count = 0;
+ auto state = initial_state();
+ while (num_digits > next(state)) ++count;
+ return count;
+ }
+
+ // Applies grouping to digits and write the output to out.
+ template <typename Out, typename C>
+ auto apply(Out out, basic_string_view<C> digits) const -> Out {
+ auto num_digits = static_cast<int>(digits.size());
+ auto separators = basic_memory_buffer<int>();
+ separators.push_back(0);
+ auto state = initial_state();
+ while (int i = next(state)) {
+ if (i >= num_digits) break;
+ separators.push_back(i);
+ }
+ for (int i = 0, sep_index = static_cast<int>(separators.size() - 1);
+ i < num_digits; ++i) {
+ if (num_digits - i == separators[sep_index]) {
+ out =
+ copy_str<Char>(thousands_sep_.data(),
+ thousands_sep_.data() + thousands_sep_.size(), out);
+ --sep_index;
+ }
+ *out++ = static_cast<Char>(digits[to_unsigned(i)]);
+ }
+ return out;
+ }
+};
+
+FMT_CONSTEXPR inline void prefix_append(unsigned& prefix, unsigned value) {
+ prefix |= prefix != 0 ? value << 8 : value;
+ prefix += (1u + (value > 0xff ? 1 : 0)) << 24;
+}
+
+// Writes a decimal integer with digit grouping.
+template <typename OutputIt, typename UInt, typename Char>
+auto write_int(OutputIt out, UInt value, unsigned prefix,
+ const format_specs<Char>& specs,
+ const digit_grouping<Char>& grouping) -> OutputIt {
+ static_assert(std::is_same<uint64_or_128_t<UInt>, UInt>::value, "");
+ int num_digits = 0;
+ auto buffer = memory_buffer();
+ switch (specs.type) {
+ case presentation_type::none:
+ case presentation_type::dec: {
+ num_digits = count_digits(value);
+ format_decimal<char>(appender(buffer), value, num_digits);
+ break;
+ }
+ case presentation_type::hex_lower:
+ case presentation_type::hex_upper: {
+ bool upper = specs.type == presentation_type::hex_upper;
+ if (specs.alt)
+ prefix_append(prefix, unsigned(upper ? 'X' : 'x') << 8 | '0');
+ num_digits = count_digits<4>(value);
+ format_uint<4, char>(appender(buffer), value, num_digits, upper);
+ break;
+ }
+ case presentation_type::bin_lower:
+ case presentation_type::bin_upper: {
+ bool upper = specs.type == presentation_type::bin_upper;
+ if (specs.alt)
+ prefix_append(prefix, unsigned(upper ? 'B' : 'b') << 8 | '0');
+ num_digits = count_digits<1>(value);
+ format_uint<1, char>(appender(buffer), value, num_digits);
+ break;
+ }
+ case presentation_type::oct: {
+ num_digits = count_digits<3>(value);
+ // Octal prefix '0' is counted as a digit, so only add it if precision
+ // is not greater than the number of digits.
+ if (specs.alt && specs.precision <= num_digits && value != 0)
+ prefix_append(prefix, '0');
+ format_uint<3, char>(appender(buffer), value, num_digits);
+ break;
+ }
+ case presentation_type::chr:
+ return write_char(out, static_cast<Char>(value), specs);
+ default:
+ throw_format_error("invalid format specifier");
+ }
+
+ unsigned size = (prefix != 0 ? prefix >> 24 : 0) + to_unsigned(num_digits) +
+ to_unsigned(grouping.count_separators(num_digits));
+ return write_padded<align::right>(
+ out, specs, size, size, [&](reserve_iterator<OutputIt> it) {
+ for (unsigned p = prefix & 0xffffff; p != 0; p >>= 8)
+ *it++ = static_cast<Char>(p & 0xff);
+ return grouping.apply(it, string_view(buffer.data(), buffer.size()));
+ });
+}
+
+// Writes a localized value.
+FMT_API auto write_loc(appender out, loc_value value,
+ const format_specs<>& specs, locale_ref loc) -> bool;
+template <typename OutputIt, typename Char>
+inline auto write_loc(OutputIt, loc_value, const format_specs<Char>&,
+ locale_ref) -> bool {
+ return false;
+}
+
+template <typename UInt> struct write_int_arg {
+ UInt abs_value;
+ unsigned prefix;
+};
+
+template <typename T>
+FMT_CONSTEXPR auto make_write_int_arg(T value, sign_t sign)
+ -> write_int_arg<uint32_or_64_or_128_t<T>> {
+ auto prefix = 0u;
+ auto abs_value = static_cast<uint32_or_64_or_128_t<T>>(value);
+ if (is_negative(value)) {
+ prefix = 0x01000000 | '-';
+ abs_value = 0 - abs_value;
+ } else {
+ constexpr const unsigned prefixes[4] = {0, 0, 0x1000000u | '+',
+ 0x1000000u | ' '};
+ prefix = prefixes[sign];
+ }
+ return {abs_value, prefix};
+}
+
+template <typename Char = char> struct loc_writer {
+ buffer_appender<Char> out;
+ const format_specs<Char>& specs;
+ std::basic_string<Char> sep;
+ std::string grouping;
+ std::basic_string<Char> decimal_point;
+
+ template <typename T, FMT_ENABLE_IF(is_integer<T>::value)>
+ auto operator()(T value) -> bool {
+ auto arg = make_write_int_arg(value, specs.sign);
+ write_int(out, static_cast<uint64_or_128_t<T>>(arg.abs_value), arg.prefix,
+ specs, digit_grouping<Char>(grouping, sep));
+ return true;
+ }
+
+ template <typename T, FMT_ENABLE_IF(!is_integer<T>::value)>
+ auto operator()(T) -> bool {
+ return false;
+ }
+};
+
+template <typename Char, typename OutputIt, typename T>
+FMT_CONSTEXPR FMT_INLINE auto write_int(OutputIt out, write_int_arg<T> arg,
+ const format_specs<Char>& specs,
+ locale_ref) -> OutputIt {
+ static_assert(std::is_same<T, uint32_or_64_or_128_t<T>>::value, "");
+ auto abs_value = arg.abs_value;
+ auto prefix = arg.prefix;
+ switch (specs.type) {
+ case presentation_type::none:
+ case presentation_type::dec: {
+ auto num_digits = count_digits(abs_value);
+ return write_int(
+ out, num_digits, prefix, specs, [=](reserve_iterator<OutputIt> it) {
+ return format_decimal<Char>(it, abs_value, num_digits).end;
+ });
+ }
+ case presentation_type::hex_lower:
+ case presentation_type::hex_upper: {
+ bool upper = specs.type == presentation_type::hex_upper;
+ if (specs.alt)
+ prefix_append(prefix, unsigned(upper ? 'X' : 'x') << 8 | '0');
+ int num_digits = count_digits<4>(abs_value);
+ return write_int(
+ out, num_digits, prefix, specs, [=](reserve_iterator<OutputIt> it) {
+ return format_uint<4, Char>(it, abs_value, num_digits, upper);
+ });
+ }
+ case presentation_type::bin_lower:
+ case presentation_type::bin_upper: {
+ bool upper = specs.type == presentation_type::bin_upper;
+ if (specs.alt)
+ prefix_append(prefix, unsigned(upper ? 'B' : 'b') << 8 | '0');
+ int num_digits = count_digits<1>(abs_value);
+ return write_int(out, num_digits, prefix, specs,
+ [=](reserve_iterator<OutputIt> it) {
+ return format_uint<1, Char>(it, abs_value, num_digits);
+ });
+ }
+ case presentation_type::oct: {
+ int num_digits = count_digits<3>(abs_value);
+ // Octal prefix '0' is counted as a digit, so only add it if precision
+ // is not greater than the number of digits.
+ if (specs.alt && specs.precision <= num_digits && abs_value != 0)
+ prefix_append(prefix, '0');
+ return write_int(out, num_digits, prefix, specs,
+ [=](reserve_iterator<OutputIt> it) {
+ return format_uint<3, Char>(it, abs_value, num_digits);
+ });
+ }
+ case presentation_type::chr:
+ return write_char(out, static_cast<Char>(abs_value), specs);
+ default:
+ throw_format_error("invalid format specifier");
+ }
+ return out;
+}
+template <typename Char, typename OutputIt, typename T>
+FMT_CONSTEXPR FMT_NOINLINE auto write_int_noinline(
+ OutputIt out, write_int_arg<T> arg, const format_specs<Char>& specs,
+ locale_ref loc) -> OutputIt {
+ return write_int(out, arg, specs, loc);
+}
+template <typename Char, typename OutputIt, typename T,
+ FMT_ENABLE_IF(is_integral<T>::value &&
+ !std::is_same<T, bool>::value &&
+ std::is_same<OutputIt, buffer_appender<Char>>::value)>
+FMT_CONSTEXPR FMT_INLINE auto write(OutputIt out, T value,
+ const format_specs<Char>& specs,
+ locale_ref loc) -> OutputIt {
+ if (specs.localized && write_loc(out, value, specs, loc)) return out;
+ return write_int_noinline(out, make_write_int_arg(value, specs.sign), specs,
+ loc);
+}
+// An inlined version of write used in format string compilation.
+template <typename Char, typename OutputIt, typename T,
+ FMT_ENABLE_IF(is_integral<T>::value &&
+ !std::is_same<T, bool>::value &&
+ !std::is_same<OutputIt, buffer_appender<Char>>::value)>
+FMT_CONSTEXPR FMT_INLINE auto write(OutputIt out, T value,
+ const format_specs<Char>& specs,
+ locale_ref loc) -> OutputIt {
+ if (specs.localized && write_loc(out, value, specs, loc)) return out;
+ return write_int(out, make_write_int_arg(value, specs.sign), specs, loc);
+}
+
+// An output iterator that counts the number of objects written to it and
+// discards them.
+class counting_iterator {
+ private:
+ size_t count_;
+
+ public:
+ using iterator_category = std::output_iterator_tag;
+ using difference_type = std::ptrdiff_t;
+ using pointer = void;
+ using reference = void;
+ FMT_UNCHECKED_ITERATOR(counting_iterator);
+
+ struct value_type {
+ template <typename T> FMT_CONSTEXPR void operator=(const T&) {}
+ };
+
+ FMT_CONSTEXPR counting_iterator() : count_(0) {}
+
+ FMT_CONSTEXPR auto count() const -> size_t { return count_; }
+
+ FMT_CONSTEXPR auto operator++() -> counting_iterator& {
+ ++count_;
+ return *this;
+ }
+ FMT_CONSTEXPR auto operator++(int) -> counting_iterator {
+ auto it = *this;
+ ++*this;
+ return it;
+ }
+
+ FMT_CONSTEXPR friend auto operator+(counting_iterator it, difference_type n)
+ -> counting_iterator {
+ it.count_ += static_cast<size_t>(n);
+ return it;
+ }
+
+ FMT_CONSTEXPR auto operator*() const -> value_type { return {}; }
+};
+
+template <typename Char, typename OutputIt>
+FMT_CONSTEXPR auto write(OutputIt out, basic_string_view<Char> s,
+ const format_specs<Char>& specs) -> OutputIt {
+ auto data = s.data();
+ auto size = s.size();
+ if (specs.precision >= 0 && to_unsigned(specs.precision) < size)
+ size = code_point_index(s, to_unsigned(specs.precision));
+ bool is_debug = specs.type == presentation_type::debug;
+ size_t width = 0;
+ if (specs.width != 0) {
+ if (is_debug)
+ width = write_escaped_string(counting_iterator{}, s).count();
+ else
+ width = compute_width(basic_string_view<Char>(data, size));
+ }
+ return write_padded(out, specs, size, width,
+ [=](reserve_iterator<OutputIt> it) {
+ if (is_debug) return write_escaped_string(it, s);
+ return copy_str<Char>(data, data + size, it);
+ });
+}
+template <typename Char, typename OutputIt>
+FMT_CONSTEXPR auto write(OutputIt out,
+ basic_string_view<type_identity_t<Char>> s,
+ const format_specs<Char>& specs, locale_ref)
+ -> OutputIt {
+ return write(out, s, specs);
+}
+template <typename Char, typename OutputIt>
+FMT_CONSTEXPR auto write(OutputIt out, const Char* s,
+ const format_specs<Char>& specs, locale_ref)
+ -> OutputIt {
+ if (specs.type == presentation_type::pointer)
+ return write_ptr<Char>(out, bit_cast<uintptr_t>(s), &specs);
+ if (!s) throw_format_error("string pointer is null");
+ return write(out, basic_string_view<Char>(s), specs, {});
+}
+
+template <typename Char, typename OutputIt, typename T,
+ FMT_ENABLE_IF(is_integral<T>::value &&
+ !std::is_same<T, bool>::value &&
+ !std::is_same<T, Char>::value)>
+FMT_CONSTEXPR auto write(OutputIt out, T value) -> OutputIt {
+ auto abs_value = static_cast<uint32_or_64_or_128_t<T>>(value);
+ bool negative = is_negative(value);
+ // Don't do -abs_value since it trips unsigned-integer-overflow sanitizer.
+ if (negative) abs_value = ~abs_value + 1;
+ int num_digits = count_digits(abs_value);
+ auto size = (negative ? 1 : 0) + static_cast<size_t>(num_digits);
+ auto it = reserve(out, size);
+ if (auto ptr = to_pointer<Char>(it, size)) {
+ if (negative) *ptr++ = static_cast<Char>('-');
+ format_decimal<Char>(ptr, abs_value, num_digits);
+ return out;
+ }
+ if (negative) *it++ = static_cast<Char>('-');
+ it = format_decimal<Char>(it, abs_value, num_digits).end;
+ return base_iterator(out, it);
+}
+
+// DEPRECATED!
+template <typename Char>
+FMT_CONSTEXPR auto parse_align(const Char* begin, const Char* end,
+ format_specs<Char>& specs) -> const Char* {
+ FMT_ASSERT(begin != end, "");
+ auto align = align::none;
+ auto p = begin + code_point_length(begin);
+ if (end - p <= 0) p = begin;
+ for (;;) {
+ switch (to_ascii(*p)) {
+ case '<':
+ align = align::left;
+ break;
+ case '>':
+ align = align::right;
+ break;
+ case '^':
+ align = align::center;
+ break;
+ }
+ if (align != align::none) {
+ if (p != begin) {
+ auto c = *begin;
+ if (c == '}') return begin;
+ if (c == '{') {
+ throw_format_error("invalid fill character '{'");
+ return begin;
+ }
+ specs.fill = {begin, to_unsigned(p - begin)};
+ begin = p + 1;
+ } else {
+ ++begin;
+ }
+ break;
+ } else if (p == begin) {
+ break;
+ }
+ p = begin;
+ }
+ specs.align = align;
+ return begin;
+}
+
+// A floating-point presentation format.
+enum class float_format : unsigned char {
+ general, // General: exponent notation or fixed point based on magnitude.
+ exp, // Exponent notation with the default precision of 6, e.g. 1.2e-3.
+ fixed, // Fixed point with the default precision of 6, e.g. 0.0012.
+ hex
+};
+
+struct float_specs {
+ int precision;
+ float_format format : 8;
+ sign_t sign : 8;
+ bool upper : 1;
+ bool locale : 1;
+ bool binary32 : 1;
+ bool showpoint : 1;
+};
+
+template <typename Char>
+FMT_CONSTEXPR auto parse_float_type_spec(const format_specs<Char>& specs)
+ -> float_specs {
+ auto result = float_specs();
+ result.showpoint = specs.alt;
+ result.locale = specs.localized;
+ switch (specs.type) {
+ case presentation_type::none:
+ result.format = float_format::general;
+ break;
+ case presentation_type::general_upper:
+ result.upper = true;
+ FMT_FALLTHROUGH;
+ case presentation_type::general_lower:
+ result.format = float_format::general;
+ break;
+ case presentation_type::exp_upper:
+ result.upper = true;
+ FMT_FALLTHROUGH;
+ case presentation_type::exp_lower:
+ result.format = float_format::exp;
+ result.showpoint |= specs.precision != 0;
+ break;
+ case presentation_type::fixed_upper:
+ result.upper = true;
+ FMT_FALLTHROUGH;
+ case presentation_type::fixed_lower:
+ result.format = float_format::fixed;
+ result.showpoint |= specs.precision != 0;
+ break;
+ case presentation_type::hexfloat_upper:
+ result.upper = true;
+ FMT_FALLTHROUGH;
+ case presentation_type::hexfloat_lower:
+ result.format = float_format::hex;
+ break;
+ default:
+ throw_format_error("invalid format specifier");
+ break;
+ }
+ return result;
+}
+
+template <typename Char, typename OutputIt>
+FMT_CONSTEXPR20 auto write_nonfinite(OutputIt out, bool isnan,
+ format_specs<Char> specs,
+ const float_specs& fspecs) -> OutputIt {
+ auto str =
+ isnan ? (fspecs.upper ? "NAN" : "nan") : (fspecs.upper ? "INF" : "inf");
+ constexpr size_t str_size = 3;
+ auto sign = fspecs.sign;
+ auto size = str_size + (sign ? 1 : 0);
+ // Replace '0'-padding with space for non-finite values.
+ const bool is_zero_fill =
+ specs.fill.size() == 1 && *specs.fill.data() == static_cast<Char>('0');
+ if (is_zero_fill) specs.fill[0] = static_cast<Char>(' ');
+ return write_padded(out, specs, size, [=](reserve_iterator<OutputIt> it) {
+ if (sign) *it++ = detail::sign<Char>(sign);
+ return copy_str<Char>(str, str + str_size, it);
+ });
+}
+
+// A decimal floating-point number significand * pow(10, exp).
+struct big_decimal_fp {
+ const char* significand;
+ int significand_size;
+ int exponent;
+};
+
+constexpr auto get_significand_size(const big_decimal_fp& f) -> int {
+ return f.significand_size;
+}
+template <typename T>
+inline auto get_significand_size(const dragonbox::decimal_fp<T>& f) -> int {
+ return count_digits(f.significand);
+}
+
+template <typename Char, typename OutputIt>
+constexpr auto write_significand(OutputIt out, const char* significand,
+ int significand_size) -> OutputIt {
+ return copy_str<Char>(significand, significand + significand_size, out);
+}
+template <typename Char, typename OutputIt, typename UInt>
+inline auto write_significand(OutputIt out, UInt significand,
+ int significand_size) -> OutputIt {
+ return format_decimal<Char>(out, significand, significand_size).end;
+}
+template <typename Char, typename OutputIt, typename T, typename Grouping>
+FMT_CONSTEXPR20 auto write_significand(OutputIt out, T significand,
+ int significand_size, int exponent,
+ const Grouping& grouping) -> OutputIt {
+ if (!grouping.has_separator()) {
+ out = write_significand<Char>(out, significand, significand_size);
+ return detail::fill_n(out, exponent, static_cast<Char>('0'));
+ }
+ auto buffer = memory_buffer();
+ write_significand<char>(appender(buffer), significand, significand_size);
+ detail::fill_n(appender(buffer), exponent, '0');
+ return grouping.apply(out, string_view(buffer.data(), buffer.size()));
+}
+
+template <typename Char, typename UInt,
+ FMT_ENABLE_IF(std::is_integral<UInt>::value)>
+inline auto write_significand(Char* out, UInt significand, int significand_size,
+ int integral_size, Char decimal_point) -> Char* {
+ if (!decimal_point)
+ return format_decimal(out, significand, significand_size).end;
+ out += significand_size + 1;
+ Char* end = out;
+ int floating_size = significand_size - integral_size;
+ for (int i = floating_size / 2; i > 0; --i) {
+ out -= 2;
+ copy2(out, digits2(static_cast<std::size_t>(significand % 100)));
+ significand /= 100;
+ }
+ if (floating_size % 2 != 0) {
+ *--out = static_cast<Char>('0' + significand % 10);
+ significand /= 10;
+ }
+ *--out = decimal_point;
+ format_decimal(out - integral_size, significand, integral_size);
+ return end;
+}
+
+template <typename OutputIt, typename UInt, typename Char,
+ FMT_ENABLE_IF(!std::is_pointer<remove_cvref_t<OutputIt>>::value)>
+inline auto write_significand(OutputIt out, UInt significand,
+ int significand_size, int integral_size,
+ Char decimal_point) -> OutputIt {
+ // Buffer is large enough to hold digits (digits10 + 1) and a decimal point.
+ Char buffer[digits10<UInt>() + 2];
+ auto end = write_significand(buffer, significand, significand_size,
+ integral_size, decimal_point);
+ return detail::copy_str_noinline<Char>(buffer, end, out);
+}
+
+template <typename OutputIt, typename Char>
+FMT_CONSTEXPR auto write_significand(OutputIt out, const char* significand,
+ int significand_size, int integral_size,
+ Char decimal_point) -> OutputIt {
+ out = detail::copy_str_noinline<Char>(significand,
+ significand + integral_size, out);
+ if (!decimal_point) return out;
+ *out++ = decimal_point;
+ return detail::copy_str_noinline<Char>(significand + integral_size,
+ significand + significand_size, out);
+}
+
+template <typename OutputIt, typename Char, typename T, typename Grouping>
+FMT_CONSTEXPR20 auto write_significand(OutputIt out, T significand,
+ int significand_size, int integral_size,
+ Char decimal_point,
+ const Grouping& grouping) -> OutputIt {
+ if (!grouping.has_separator()) {
+ return write_significand(out, significand, significand_size, integral_size,
+ decimal_point);
+ }
+ auto buffer = basic_memory_buffer<Char>();
+ write_significand(buffer_appender<Char>(buffer), significand,
+ significand_size, integral_size, decimal_point);
+ grouping.apply(
+ out, basic_string_view<Char>(buffer.data(), to_unsigned(integral_size)));
+ return detail::copy_str_noinline<Char>(buffer.data() + integral_size,
+ buffer.end(), out);
+}
+
+template <typename OutputIt, typename DecimalFP, typename Char,
+ typename Grouping = digit_grouping<Char>>
+FMT_CONSTEXPR20 auto do_write_float(OutputIt out, const DecimalFP& f,
+ const format_specs<Char>& specs,
+ float_specs fspecs, locale_ref loc)
+ -> OutputIt {
+ auto significand = f.significand;
+ int significand_size = get_significand_size(f);
+ const Char zero = static_cast<Char>('0');
+ auto sign = fspecs.sign;
+ size_t size = to_unsigned(significand_size) + (sign ? 1 : 0);
+ using iterator = reserve_iterator<OutputIt>;
+
+ Char decimal_point =
+ fspecs.locale ? detail::decimal_point<Char>(loc) : static_cast<Char>('.');
+
+ int output_exp = f.exponent + significand_size - 1;
+ auto use_exp_format = [=]() {
+ if (fspecs.format == float_format::exp) return true;
+ if (fspecs.format != float_format::general) return false;
+ // Use the fixed notation if the exponent is in [exp_lower, exp_upper),
+ // e.g. 0.0001 instead of 1e-04. Otherwise use the exponent notation.
+ const int exp_lower = -4, exp_upper = 16;
+ return output_exp < exp_lower ||
+ output_exp >= (fspecs.precision > 0 ? fspecs.precision : exp_upper);
+ };
+ if (use_exp_format()) {
+ int num_zeros = 0;
+ if (fspecs.showpoint) {
+ num_zeros = fspecs.precision - significand_size;
+ if (num_zeros < 0) num_zeros = 0;
+ size += to_unsigned(num_zeros);
+ } else if (significand_size == 1) {
+ decimal_point = Char();
+ }
+ auto abs_output_exp = output_exp >= 0 ? output_exp : -output_exp;
+ int exp_digits = 2;
+ if (abs_output_exp >= 100) exp_digits = abs_output_exp >= 1000 ? 4 : 3;
+
+ size += to_unsigned((decimal_point ? 1 : 0) + 2 + exp_digits);
+ char exp_char = fspecs.upper ? 'E' : 'e';
+ auto write = [=](iterator it) {
+ if (sign) *it++ = detail::sign<Char>(sign);
+ // Insert a decimal point after the first digit and add an exponent.
+ it = write_significand(it, significand, significand_size, 1,
+ decimal_point);
+ if (num_zeros > 0) it = detail::fill_n(it, num_zeros, zero);
+ *it++ = static_cast<Char>(exp_char);
+ return write_exponent<Char>(output_exp, it);
+ };
+ return specs.width > 0 ? write_padded<align::right>(out, specs, size, write)
+ : base_iterator(out, write(reserve(out, size)));
+ }
+
+ int exp = f.exponent + significand_size;
+ if (f.exponent >= 0) {
+ // 1234e5 -> 123400000[.0+]
+ size += to_unsigned(f.exponent);
+ int num_zeros = fspecs.precision - exp;
+ abort_fuzzing_if(num_zeros > 5000);
+ if (fspecs.showpoint) {
+ ++size;
+ if (num_zeros <= 0 && fspecs.format != float_format::fixed) num_zeros = 0;
+ if (num_zeros > 0) size += to_unsigned(num_zeros);
+ }
+ auto grouping = Grouping(loc, fspecs.locale);
+ size += to_unsigned(grouping.count_separators(exp));
+ return write_padded<align::right>(out, specs, size, [&](iterator it) {
+ if (sign) *it++ = detail::sign<Char>(sign);
+ it = write_significand<Char>(it, significand, significand_size,
+ f.exponent, grouping);
+ if (!fspecs.showpoint) return it;
+ *it++ = decimal_point;
+ return num_zeros > 0 ? detail::fill_n(it, num_zeros, zero) : it;
+ });
+ } else if (exp > 0) {
+ // 1234e-2 -> 12.34[0+]
+ int num_zeros = fspecs.showpoint ? fspecs.precision - significand_size : 0;
+ size += 1 + to_unsigned(num_zeros > 0 ? num_zeros : 0);
+ auto grouping = Grouping(loc, fspecs.locale);
+ size += to_unsigned(grouping.count_separators(exp));
+ return write_padded<align::right>(out, specs, size, [&](iterator it) {
+ if (sign) *it++ = detail::sign<Char>(sign);
+ it = write_significand(it, significand, significand_size, exp,
+ decimal_point, grouping);
+ return num_zeros > 0 ? detail::fill_n(it, num_zeros, zero) : it;
+ });
+ }
+ // 1234e-6 -> 0.001234
+ int num_zeros = -exp;
+ if (significand_size == 0 && fspecs.precision >= 0 &&
+ fspecs.precision < num_zeros) {
+ num_zeros = fspecs.precision;
+ }
+ bool pointy = num_zeros != 0 || significand_size != 0 || fspecs.showpoint;
+ size += 1 + (pointy ? 1 : 0) + to_unsigned(num_zeros);
+ return write_padded<align::right>(out, specs, size, [&](iterator it) {
+ if (sign) *it++ = detail::sign<Char>(sign);
+ *it++ = zero;
+ if (!pointy) return it;
+ *it++ = decimal_point;
+ it = detail::fill_n(it, num_zeros, zero);
+ return write_significand<Char>(it, significand, significand_size);
+ });
+}
+
+template <typename Char> class fallback_digit_grouping {
+ public:
+ constexpr fallback_digit_grouping(locale_ref, bool) {}
+
+ constexpr auto has_separator() const -> bool { return false; }
+
+ constexpr auto count_separators(int) const -> int { return 0; }
+
+ template <typename Out, typename C>
+ constexpr auto apply(Out out, basic_string_view<C>) const -> Out {
+ return out;
+ }
+};
+
+template <typename OutputIt, typename DecimalFP, typename Char>
+FMT_CONSTEXPR20 auto write_float(OutputIt out, const DecimalFP& f,
+ const format_specs<Char>& specs,
+ float_specs fspecs, locale_ref loc)
+ -> OutputIt {
+ if (is_constant_evaluated()) {
+ return do_write_float<OutputIt, DecimalFP, Char,
+ fallback_digit_grouping<Char>>(out, f, specs, fspecs,
+ loc);
+ } else {
+ return do_write_float(out, f, specs, fspecs, loc);
+ }
+}
+
+template <typename T> constexpr auto isnan(T value) -> bool {
+ return !(value >= value); // std::isnan doesn't support __float128.
+}
+
+template <typename T, typename Enable = void>
+struct has_isfinite : std::false_type {};
+
+template <typename T>
+struct has_isfinite<T, enable_if_t<sizeof(std::isfinite(T())) != 0>>
+ : std::true_type {};
+
+template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value&&
+ has_isfinite<T>::value)>
+FMT_CONSTEXPR20 auto isfinite(T value) -> bool {
+ constexpr T inf = T(std::numeric_limits<double>::infinity());
+ if (is_constant_evaluated())
+ return !detail::isnan(value) && value < inf && value > -inf;
+ return std::isfinite(value);
+}
+template <typename T, FMT_ENABLE_IF(!has_isfinite<T>::value)>
+FMT_CONSTEXPR auto isfinite(T value) -> bool {
+ T inf = T(std::numeric_limits<double>::infinity());
+ // std::isfinite doesn't support __float128.
+ return !detail::isnan(value) && value < inf && value > -inf;
+}
+
+template <typename T, FMT_ENABLE_IF(is_floating_point<T>::value)>
+FMT_INLINE FMT_CONSTEXPR bool signbit(T value) {
+ if (is_constant_evaluated()) {
+#ifdef __cpp_if_constexpr
+ if constexpr (std::numeric_limits<double>::is_iec559) {
+ auto bits = detail::bit_cast<uint64_t>(static_cast<double>(value));
+ return (bits >> (num_bits<uint64_t>() - 1)) != 0;
+ }
+#endif
+ }
+ return std::signbit(static_cast<double>(value));
+}
+
+inline FMT_CONSTEXPR20 void adjust_precision(int& precision, int exp10) {
+ // Adjust fixed precision by exponent because it is relative to decimal
+ // point.
+ if (exp10 > 0 && precision > max_value<int>() - exp10)
+ FMT_THROW(format_error("number is too big"));
+ precision += exp10;
+}
+
+class bigint {
+ private:
+ // A bigint is stored as an array of bigits (big digits), with bigit at index
+ // 0 being the least significant one.
+ using bigit = uint32_t;
+ using double_bigit = uint64_t;
+ enum { bigits_capacity = 32 };
+ basic_memory_buffer<bigit, bigits_capacity> bigits_;
+ int exp_;
+
+ FMT_CONSTEXPR20 auto operator[](int index) const -> bigit {
+ return bigits_[to_unsigned(index)];
+ }
+ FMT_CONSTEXPR20 auto operator[](int index) -> bigit& {
+ return bigits_[to_unsigned(index)];
+ }
+
+ static constexpr const int bigit_bits = num_bits<bigit>();
+
+ friend struct formatter<bigint>;
+
+ FMT_CONSTEXPR20 void subtract_bigits(int index, bigit other, bigit& borrow) {
+ auto result = static_cast<double_bigit>((*this)[index]) - other - borrow;
+ (*this)[index] = static_cast<bigit>(result);
+ borrow = static_cast<bigit>(result >> (bigit_bits * 2 - 1));
+ }
+
+ FMT_CONSTEXPR20 void remove_leading_zeros() {
+ int num_bigits = static_cast<int>(bigits_.size()) - 1;
+ while (num_bigits > 0 && (*this)[num_bigits] == 0) --num_bigits;
+ bigits_.resize(to_unsigned(num_bigits + 1));
+ }
+
+ // Computes *this -= other assuming aligned bigints and *this >= other.
+ FMT_CONSTEXPR20 void subtract_aligned(const bigint& other) {
+ FMT_ASSERT(other.exp_ >= exp_, "unaligned bigints");
+ FMT_ASSERT(compare(*this, other) >= 0, "");
+ bigit borrow = 0;
+ int i = other.exp_ - exp_;
+ for (size_t j = 0, n = other.bigits_.size(); j != n; ++i, ++j)
+ subtract_bigits(i, other.bigits_[j], borrow);
+ while (borrow > 0) subtract_bigits(i, 0, borrow);
+ remove_leading_zeros();
+ }
+
+ FMT_CONSTEXPR20 void multiply(uint32_t value) {
+ const double_bigit wide_value = value;
+ bigit carry = 0;
+ for (size_t i = 0, n = bigits_.size(); i < n; ++i) {
+ double_bigit result = bigits_[i] * wide_value + carry;
+ bigits_[i] = static_cast<bigit>(result);
+ carry = static_cast<bigit>(result >> bigit_bits);
+ }
+ if (carry != 0) bigits_.push_back(carry);
+ }
+
+ template <typename UInt, FMT_ENABLE_IF(std::is_same<UInt, uint64_t>::value ||
+ std::is_same<UInt, uint128_t>::value)>
+ FMT_CONSTEXPR20 void multiply(UInt value) {
+ using half_uint =
+ conditional_t<std::is_same<UInt, uint128_t>::value, uint64_t, uint32_t>;
+ const int shift = num_bits<half_uint>() - bigit_bits;
+ const UInt lower = static_cast<half_uint>(value);
+ const UInt upper = value >> num_bits<half_uint>();
+ UInt carry = 0;
+ for (size_t i = 0, n = bigits_.size(); i < n; ++i) {
+ UInt result = lower * bigits_[i] + static_cast<bigit>(carry);
+ carry = (upper * bigits_[i] << shift) + (result >> bigit_bits) +
+ (carry >> bigit_bits);
+ bigits_[i] = static_cast<bigit>(result);
+ }
+ while (carry != 0) {
+ bigits_.push_back(static_cast<bigit>(carry));
+ carry >>= bigit_bits;
+ }
+ }
+
+ template <typename UInt, FMT_ENABLE_IF(std::is_same<UInt, uint64_t>::value ||
+ std::is_same<UInt, uint128_t>::value)>
+ FMT_CONSTEXPR20 void assign(UInt n) {
+ size_t num_bigits = 0;
+ do {
+ bigits_[num_bigits++] = static_cast<bigit>(n);
+ n >>= bigit_bits;
+ } while (n != 0);
+ bigits_.resize(num_bigits);
+ exp_ = 0;
+ }
+
+ public:
+ FMT_CONSTEXPR20 bigint() : exp_(0) {}
+ explicit bigint(uint64_t n) { assign(n); }
+
+ bigint(const bigint&) = delete;
+ void operator=(const bigint&) = delete;
+
+ FMT_CONSTEXPR20 void assign(const bigint& other) {
+ auto size = other.bigits_.size();
+ bigits_.resize(size);
+ auto data = other.bigits_.data();
+ copy_str<bigit>(data, data + size, bigits_.data());
+ exp_ = other.exp_;
+ }
+
+ template <typename Int> FMT_CONSTEXPR20 void operator=(Int n) {
+ FMT_ASSERT(n > 0, "");
+ assign(uint64_or_128_t<Int>(n));
+ }
+
+ FMT_CONSTEXPR20 auto num_bigits() const -> int {
+ return static_cast<int>(bigits_.size()) + exp_;
+ }
+
+ FMT_NOINLINE FMT_CONSTEXPR20 auto operator<<=(int shift) -> bigint& {
+ FMT_ASSERT(shift >= 0, "");
+ exp_ += shift / bigit_bits;
+ shift %= bigit_bits;
+ if (shift == 0) return *this;
+ bigit carry = 0;
+ for (size_t i = 0, n = bigits_.size(); i < n; ++i) {
+ bigit c = bigits_[i] >> (bigit_bits - shift);
+ bigits_[i] = (bigits_[i] << shift) + carry;
+ carry = c;
+ }
+ if (carry != 0) bigits_.push_back(carry);
+ return *this;
+ }
+
+ template <typename Int>
+ FMT_CONSTEXPR20 auto operator*=(Int value) -> bigint& {
+ FMT_ASSERT(value > 0, "");
+ multiply(uint32_or_64_or_128_t<Int>(value));
+ return *this;
+ }
+
+ friend FMT_CONSTEXPR20 auto compare(const bigint& lhs, const bigint& rhs)
+ -> int {
+ int num_lhs_bigits = lhs.num_bigits(), num_rhs_bigits = rhs.num_bigits();
+ if (num_lhs_bigits != num_rhs_bigits)
+ return num_lhs_bigits > num_rhs_bigits ? 1 : -1;
+ int i = static_cast<int>(lhs.bigits_.size()) - 1;
+ int j = static_cast<int>(rhs.bigits_.size()) - 1;
+ int end = i - j;
+ if (end < 0) end = 0;
+ for (; i >= end; --i, --j) {
+ bigit lhs_bigit = lhs[i], rhs_bigit = rhs[j];
+ if (lhs_bigit != rhs_bigit) return lhs_bigit > rhs_bigit ? 1 : -1;
+ }
+ if (i != j) return i > j ? 1 : -1;
+ return 0;
+ }
+
+ // Returns compare(lhs1 + lhs2, rhs).
+ friend FMT_CONSTEXPR20 auto add_compare(const bigint& lhs1,
+ const bigint& lhs2, const bigint& rhs)
+ -> int {
+ auto minimum = [](int a, int b) { return a < b ? a : b; };
+ auto maximum = [](int a, int b) { return a > b ? a : b; };
+ int max_lhs_bigits = maximum(lhs1.num_bigits(), lhs2.num_bigits());
+ int num_rhs_bigits = rhs.num_bigits();
+ if (max_lhs_bigits + 1 < num_rhs_bigits) return -1;
+ if (max_lhs_bigits > num_rhs_bigits) return 1;
+ auto get_bigit = [](const bigint& n, int i) -> bigit {
+ return i >= n.exp_ && i < n.num_bigits() ? n[i - n.exp_] : 0;
+ };
+ double_bigit borrow = 0;
+ int min_exp = minimum(minimum(lhs1.exp_, lhs2.exp_), rhs.exp_);
+ for (int i = num_rhs_bigits - 1; i >= min_exp; --i) {
+ double_bigit sum =
+ static_cast<double_bigit>(get_bigit(lhs1, i)) + get_bigit(lhs2, i);
+ bigit rhs_bigit = get_bigit(rhs, i);
+ if (sum > rhs_bigit + borrow) return 1;
+ borrow = rhs_bigit + borrow - sum;
+ if (borrow > 1) return -1;
+ borrow <<= bigit_bits;
+ }
+ return borrow != 0 ? -1 : 0;
+ }
+
+ // Assigns pow(10, exp) to this bigint.
+ FMT_CONSTEXPR20 void assign_pow10(int exp) {
+ FMT_ASSERT(exp >= 0, "");
+ if (exp == 0) return *this = 1;
+ // Find the top bit.
+ int bitmask = 1;
+ while (exp >= bitmask) bitmask <<= 1;
+ bitmask >>= 1;
+ // pow(10, exp) = pow(5, exp) * pow(2, exp). First compute pow(5, exp) by
+ // repeated squaring and multiplication.
+ *this = 5;
+ bitmask >>= 1;
+ while (bitmask != 0) {
+ square();
+ if ((exp & bitmask) != 0) *this *= 5;
+ bitmask >>= 1;
+ }
+ *this <<= exp; // Multiply by pow(2, exp) by shifting.
+ }
+
+ FMT_CONSTEXPR20 void square() {
+ int num_bigits = static_cast<int>(bigits_.size());
+ int num_result_bigits = 2 * num_bigits;
+ basic_memory_buffer<bigit, bigits_capacity> n(std::move(bigits_));
+ bigits_.resize(to_unsigned(num_result_bigits));
+ auto sum = uint128_t();
+ for (int bigit_index = 0; bigit_index < num_bigits; ++bigit_index) {
+ // Compute bigit at position bigit_index of the result by adding
+ // cross-product terms n[i] * n[j] such that i + j == bigit_index.
+ for (int i = 0, j = bigit_index; j >= 0; ++i, --j) {
+ // Most terms are multiplied twice which can be optimized in the future.
+ sum += static_cast<double_bigit>(n[i]) * n[j];
+ }
+ (*this)[bigit_index] = static_cast<bigit>(sum);
+ sum >>= num_bits<bigit>(); // Compute the carry.
+ }
+ // Do the same for the top half.
+ for (int bigit_index = num_bigits; bigit_index < num_result_bigits;
+ ++bigit_index) {
+ for (int j = num_bigits - 1, i = bigit_index - j; i < num_bigits;)
+ sum += static_cast<double_bigit>(n[i++]) * n[j--];
+ (*this)[bigit_index] = static_cast<bigit>(sum);
+ sum >>= num_bits<bigit>();
+ }
+ remove_leading_zeros();
+ exp_ *= 2;
+ }
+
+ // If this bigint has a bigger exponent than other, adds trailing zero to make
+ // exponents equal. This simplifies some operations such as subtraction.
+ FMT_CONSTEXPR20 void align(const bigint& other) {
+ int exp_difference = exp_ - other.exp_;
+ if (exp_difference <= 0) return;
+ int num_bigits = static_cast<int>(bigits_.size());
+ bigits_.resize(to_unsigned(num_bigits + exp_difference));
+ for (int i = num_bigits - 1, j = i + exp_difference; i >= 0; --i, --j)
+ bigits_[j] = bigits_[i];
+ std::uninitialized_fill_n(bigits_.data(), exp_difference, 0u);
+ exp_ -= exp_difference;
+ }
+
+ // Divides this bignum by divisor, assigning the remainder to this and
+ // returning the quotient.
+ FMT_CONSTEXPR20 auto divmod_assign(const bigint& divisor) -> int {
+ FMT_ASSERT(this != &divisor, "");
+ if (compare(*this, divisor) < 0) return 0;
+ FMT_ASSERT(divisor.bigits_[divisor.bigits_.size() - 1u] != 0, "");
+ align(divisor);
+ int quotient = 0;
+ do {
+ subtract_aligned(divisor);
+ ++quotient;
+ } while (compare(*this, divisor) >= 0);
+ return quotient;
+ }
+};
+
+// format_dragon flags.
+enum dragon {
+ predecessor_closer = 1,
+ fixup = 2, // Run fixup to correct exp10 which can be off by one.
+ fixed = 4,
+};
+
+// Formats a floating-point number using a variation of the Fixed-Precision
+// Positive Floating-Point Printout ((FPP)^2) algorithm by Steele & White:
+// https://fmt.dev/papers/p372-steele.pdf.
+FMT_CONSTEXPR20 inline void format_dragon(basic_fp<uint128_t> value,
+ unsigned flags, int num_digits,
+ buffer<char>& buf, int& exp10) {
+ bigint numerator; // 2 * R in (FPP)^2.
+ bigint denominator; // 2 * S in (FPP)^2.
+ // lower and upper are differences between value and corresponding boundaries.
+ bigint lower; // (M^- in (FPP)^2).
+ bigint upper_store; // upper's value if different from lower.
+ bigint* upper = nullptr; // (M^+ in (FPP)^2).
+ // Shift numerator and denominator by an extra bit or two (if lower boundary
+ // is closer) to make lower and upper integers. This eliminates multiplication
+ // by 2 during later computations.
+ bool is_predecessor_closer = (flags & dragon::predecessor_closer) != 0;
+ int shift = is_predecessor_closer ? 2 : 1;
+ if (value.e >= 0) {
+ numerator = value.f;
+ numerator <<= value.e + shift;
+ lower = 1;
+ lower <<= value.e;
+ if (is_predecessor_closer) {
+ upper_store = 1;
+ upper_store <<= value.e + 1;
+ upper = &upper_store;
+ }
+ denominator.assign_pow10(exp10);
+ denominator <<= shift;
+ } else if (exp10 < 0) {
+ numerator.assign_pow10(-exp10);
+ lower.assign(numerator);
+ if (is_predecessor_closer) {
+ upper_store.assign(numerator);
+ upper_store <<= 1;
+ upper = &upper_store;
+ }
+ numerator *= value.f;
+ numerator <<= shift;
+ denominator = 1;
+ denominator <<= shift - value.e;
+ } else {
+ numerator = value.f;
+ numerator <<= shift;
+ denominator.assign_pow10(exp10);
+ denominator <<= shift - value.e;
+ lower = 1;
+ if (is_predecessor_closer) {
+ upper_store = 1ULL << 1;
+ upper = &upper_store;
+ }
+ }
+ int even = static_cast<int>((value.f & 1) == 0);
+ if (!upper) upper = &lower;
+ bool shortest = num_digits < 0;
+ if ((flags & dragon::fixup) != 0) {
+ if (add_compare(numerator, *upper, denominator) + even <= 0) {
+ --exp10;
+ numerator *= 10;
+ if (num_digits < 0) {
+ lower *= 10;
+ if (upper != &lower) *upper *= 10;
+ }
+ }
+ if ((flags & dragon::fixed) != 0) adjust_precision(num_digits, exp10 + 1);
+ }
+ // Invariant: value == (numerator / denominator) * pow(10, exp10).
+ if (shortest) {
+ // Generate the shortest representation.
+ num_digits = 0;
+ char* data = buf.data();
+ for (;;) {
+ int digit = numerator.divmod_assign(denominator);
+ bool low = compare(numerator, lower) - even < 0; // numerator <[=] lower.
+ // numerator + upper >[=] pow10:
+ bool high = add_compare(numerator, *upper, denominator) + even > 0;
+ data[num_digits++] = static_cast<char>('0' + digit);
+ if (low || high) {
+ if (!low) {
+ ++data[num_digits - 1];
+ } else if (high) {
+ int result = add_compare(numerator, numerator, denominator);
+ // Round half to even.
+ if (result > 0 || (result == 0 && (digit % 2) != 0))
+ ++data[num_digits - 1];
+ }
+ buf.try_resize(to_unsigned(num_digits));
+ exp10 -= num_digits - 1;
+ return;
+ }
+ numerator *= 10;
+ lower *= 10;
+ if (upper != &lower) *upper *= 10;
+ }
+ }
+ // Generate the given number of digits.
+ exp10 -= num_digits - 1;
+ if (num_digits <= 0) {
+ denominator *= 10;
+ auto digit = add_compare(numerator, numerator, denominator) > 0 ? '1' : '0';
+ buf.push_back(digit);
+ return;
+ }
+ buf.try_resize(to_unsigned(num_digits));
+ for (int i = 0; i < num_digits - 1; ++i) {
+ int digit = numerator.divmod_assign(denominator);
+ buf[i] = static_cast<char>('0' + digit);
+ numerator *= 10;
+ }
+ int digit = numerator.divmod_assign(denominator);
+ auto result = add_compare(numerator, numerator, denominator);
+ if (result > 0 || (result == 0 && (digit % 2) != 0)) {
+ if (digit == 9) {
+ const auto overflow = '0' + 10;
+ buf[num_digits - 1] = overflow;
+ // Propagate the carry.
+ for (int i = num_digits - 1; i > 0 && buf[i] == overflow; --i) {
+ buf[i] = '0';
+ ++buf[i - 1];
+ }
+ if (buf[0] == overflow) {
+ buf[0] = '1';
+ if ((flags & dragon::fixed) != 0)
+ buf.push_back('0');
+ else
+ ++exp10;
+ }
+ return;
+ }
+ ++digit;
+ }
+ buf[num_digits - 1] = static_cast<char>('0' + digit);
+}
+
+// Formats a floating-point number using the hexfloat format.
+template <typename Float, FMT_ENABLE_IF(!is_double_double<Float>::value)>
+FMT_CONSTEXPR20 void format_hexfloat(Float value, int precision,
+ float_specs specs, buffer<char>& buf) {
+ // float is passed as double to reduce the number of instantiations and to
+ // simplify implementation.
+ static_assert(!std::is_same<Float, float>::value, "");
+
+ using info = dragonbox::float_info<Float>;
+
+ // Assume Float is in the format [sign][exponent][significand].
+ using carrier_uint = typename info::carrier_uint;
+
+ constexpr auto num_float_significand_bits =
+ detail::num_significand_bits<Float>();
+
+ basic_fp<carrier_uint> f(value);
+ f.e += num_float_significand_bits;
+ if (!has_implicit_bit<Float>()) --f.e;
+
+ constexpr auto num_fraction_bits =
+ num_float_significand_bits + (has_implicit_bit<Float>() ? 1 : 0);
+ constexpr auto num_xdigits = (num_fraction_bits + 3) / 4;
+
+ constexpr auto leading_shift = ((num_xdigits - 1) * 4);
+ const auto leading_mask = carrier_uint(0xF) << leading_shift;
+ const auto leading_xdigit =
+ static_cast<uint32_t>((f.f & leading_mask) >> leading_shift);
+ if (leading_xdigit > 1) f.e -= (32 - countl_zero(leading_xdigit) - 1);
+
+ int print_xdigits = num_xdigits - 1;
+ if (precision >= 0 && print_xdigits > precision) {
+ const int shift = ((print_xdigits - precision - 1) * 4);
+ const auto mask = carrier_uint(0xF) << shift;
+ const auto v = static_cast<uint32_t>((f.f & mask) >> shift);
+
+ if (v >= 8) {
+ const auto inc = carrier_uint(1) << (shift + 4);
+ f.f += inc;
+ f.f &= ~(inc - 1);
+ }
+
+ // Check long double overflow
+ if (!has_implicit_bit<Float>()) {
+ const auto implicit_bit = carrier_uint(1) << num_float_significand_bits;
+ if ((f.f & implicit_bit) == implicit_bit) {
+ f.f >>= 4;
+ f.e += 4;
+ }
+ }
+
+ print_xdigits = precision;
+ }
+
+ char xdigits[num_bits<carrier_uint>() / 4];
+ detail::fill_n(xdigits, sizeof(xdigits), '0');
+ format_uint<4>(xdigits, f.f, num_xdigits, specs.upper);
+
+ // Remove zero tail
+ while (print_xdigits > 0 && xdigits[print_xdigits] == '0') --print_xdigits;
+
+ buf.push_back('0');
+ buf.push_back(specs.upper ? 'X' : 'x');
+ buf.push_back(xdigits[0]);
+ if (specs.showpoint || print_xdigits > 0 || print_xdigits < precision)
+ buf.push_back('.');
+ buf.append(xdigits + 1, xdigits + 1 + print_xdigits);
+ for (; print_xdigits < precision; ++print_xdigits) buf.push_back('0');
+
+ buf.push_back(specs.upper ? 'P' : 'p');
+
+ uint32_t abs_e;
+ if (f.e < 0) {
+ buf.push_back('-');
+ abs_e = static_cast<uint32_t>(-f.e);
+ } else {
+ buf.push_back('+');
+ abs_e = static_cast<uint32_t>(f.e);
+ }
+ format_decimal<char>(appender(buf), abs_e, detail::count_digits(abs_e));
+}
+
+template <typename Float, FMT_ENABLE_IF(is_double_double<Float>::value)>
+FMT_CONSTEXPR20 void format_hexfloat(Float value, int precision,
+ float_specs specs, buffer<char>& buf) {
+ format_hexfloat(static_cast<double>(value), precision, specs, buf);
+}
+
+constexpr auto fractional_part_rounding_thresholds(int index) -> uint32_t {
+ // For checking rounding thresholds.
+ // The kth entry is chosen to be the smallest integer such that the
+ // upper 32-bits of 10^(k+1) times it is strictly bigger than 5 * 10^k.
+ // It is equal to ceil(2^31 + 2^32/10^(k + 1)).
+ // These are stored in a string literal because we cannot have static arrays
+ // in constexpr functions and non-static ones are poorly optimized.
+ return U"\x9999999a\x828f5c29\x80418938\x80068db9\x8000a7c6\x800010c7"
+ U"\x800001ae\x8000002b"[index];
+}
+
+template <typename Float>
+FMT_CONSTEXPR20 auto format_float(Float value, int precision, float_specs specs,
+ buffer<char>& buf) -> int {
+ // float is passed as double to reduce the number of instantiations.
+ static_assert(!std::is_same<Float, float>::value, "");
+ FMT_ASSERT(value >= 0, "value is negative");
+ auto converted_value = convert_float(value);
+
+ const bool fixed = specs.format == float_format::fixed;
+ if (value <= 0) { // <= instead of == to silence a warning.
+ if (precision <= 0 || !fixed) {
+ buf.push_back('0');
+ return 0;
+ }
+ buf.try_resize(to_unsigned(precision));
+ fill_n(buf.data(), precision, '0');
+ return -precision;
+ }
+
+ int exp = 0;
+ bool use_dragon = true;
+ unsigned dragon_flags = 0;
+ if (!is_fast_float<Float>() || is_constant_evaluated()) {
+ const auto inv_log2_10 = 0.3010299956639812; // 1 / log2(10)
+ using info = dragonbox::float_info<decltype(converted_value)>;
+ const auto f = basic_fp<typename info::carrier_uint>(converted_value);
+ // Compute exp, an approximate power of 10, such that
+ // 10^(exp - 1) <= value < 10^exp or 10^exp <= value < 10^(exp + 1).
+ // This is based on log10(value) == log2(value) / log2(10) and approximation
+ // of log2(value) by e + num_fraction_bits idea from double-conversion.
+ auto e = (f.e + count_digits<1>(f.f) - 1) * inv_log2_10 - 1e-10;
+ exp = static_cast<int>(e);
+ if (e > exp) ++exp; // Compute ceil.
+ dragon_flags = dragon::fixup;
+ } else if (precision < 0) {
+ // Use Dragonbox for the shortest format.
+ if (specs.binary32) {
+ auto dec = dragonbox::to_decimal(static_cast<float>(value));
+ write<char>(buffer_appender<char>(buf), dec.significand);
+ return dec.exponent;
+ }
+ auto dec = dragonbox::to_decimal(static_cast<double>(value));
+ write<char>(buffer_appender<char>(buf), dec.significand);
+ return dec.exponent;
+ } else {
+ // Extract significand bits and exponent bits.
+ using info = dragonbox::float_info<double>;
+ auto br = bit_cast<uint64_t>(static_cast<double>(value));
+
+ const uint64_t significand_mask =
+ (static_cast<uint64_t>(1) << num_significand_bits<double>()) - 1;
+ uint64_t significand = (br & significand_mask);
+ int exponent = static_cast<int>((br & exponent_mask<double>()) >>
+ num_significand_bits<double>());
+
+ if (exponent != 0) { // Check if normal.
+ exponent -= exponent_bias<double>() + num_significand_bits<double>();
+ significand |=
+ (static_cast<uint64_t>(1) << num_significand_bits<double>());
+ significand <<= 1;
+ } else {
+ // Normalize subnormal inputs.
+ FMT_ASSERT(significand != 0, "zeros should not appear here");
+ int shift = countl_zero(significand);
+ FMT_ASSERT(shift >= num_bits<uint64_t>() - num_significand_bits<double>(),
+ "");
+ shift -= (num_bits<uint64_t>() - num_significand_bits<double>() - 2);
+ exponent = (std::numeric_limits<double>::min_exponent -
+ num_significand_bits<double>()) -
+ shift;
+ significand <<= shift;
+ }
+
+ // Compute the first several nonzero decimal significand digits.
+ // We call the number we get the first segment.
+ const int k = info::kappa - dragonbox::floor_log10_pow2(exponent);
+ exp = -k;
+ const int beta = exponent + dragonbox::floor_log2_pow10(k);
+ uint64_t first_segment;
+ bool has_more_segments;
+ int digits_in_the_first_segment;
+ {
+ const auto r = dragonbox::umul192_upper128(
+ significand << beta, dragonbox::get_cached_power(k));
+ first_segment = r.high();
+ has_more_segments = r.low() != 0;
+
+ // The first segment can have 18 ~ 19 digits.
+ if (first_segment >= 1000000000000000000ULL) {
+ digits_in_the_first_segment = 19;
+ } else {
+ // When it is of 18-digits, we align it to 19-digits by adding a bogus
+ // zero at the end.
+ digits_in_the_first_segment = 18;
+ first_segment *= 10;
+ }
+ }
+
+ // Compute the actual number of decimal digits to print.
+ if (fixed) adjust_precision(precision, exp + digits_in_the_first_segment);
+
+ // Use Dragon4 only when there might be not enough digits in the first
+ // segment.
+ if (digits_in_the_first_segment > precision) {
+ use_dragon = false;
+
+ if (precision <= 0) {
+ exp += digits_in_the_first_segment;
+
+ if (precision < 0) {
+ // Nothing to do, since all we have are just leading zeros.
+ buf.try_resize(0);
+ } else {
+ // We may need to round-up.
+ buf.try_resize(1);
+ if ((first_segment | static_cast<uint64_t>(has_more_segments)) >
+ 5000000000000000000ULL) {
+ buf[0] = '1';
+ } else {
+ buf[0] = '0';
+ }
+ }
+ } // precision <= 0
+ else {
+ exp += digits_in_the_first_segment - precision;
+
+ // When precision > 0, we divide the first segment into three
+ // subsegments, each with 9, 9, and 0 ~ 1 digits so that each fits
+ // in 32-bits which usually allows faster calculation than in
+ // 64-bits. Since some compiler (e.g. MSVC) doesn't know how to optimize
+ // division-by-constant for large 64-bit divisors, we do it here
+ // manually. The magic number 7922816251426433760 below is equal to
+ // ceil(2^(64+32) / 10^10).
+ const uint32_t first_subsegment = static_cast<uint32_t>(
+ dragonbox::umul128_upper64(first_segment, 7922816251426433760ULL) >>
+ 32);
+ const uint64_t second_third_subsegments =
+ first_segment - first_subsegment * 10000000000ULL;
+
+ uint64_t prod;
+ uint32_t digits;
+ bool should_round_up;
+ int number_of_digits_to_print = precision > 9 ? 9 : precision;
+
+ // Print a 9-digits subsegment, either the first or the second.
+ auto print_subsegment = [&](uint32_t subsegment, char* buffer) {
+ int number_of_digits_printed = 0;
+
+ // If we want to print an odd number of digits from the subsegment,
+ if ((number_of_digits_to_print & 1) != 0) {
+ // Convert to 64-bit fixed-point fractional form with 1-digit
+ // integer part. The magic number 720575941 is a good enough
+ // approximation of 2^(32 + 24) / 10^8; see
+ // https://jk-jeon.github.io/posts/2022/12/fixed-precision-formatting/#fixed-length-case
+ // for details.
+ prod = ((subsegment * static_cast<uint64_t>(720575941)) >> 24) + 1;
+ digits = static_cast<uint32_t>(prod >> 32);
+ *buffer = static_cast<char>('0' + digits);
+ number_of_digits_printed++;
+ }
+ // If we want to print an even number of digits from the
+ // first_subsegment,
+ else {
+ // Convert to 64-bit fixed-point fractional form with 2-digits
+ // integer part. The magic number 450359963 is a good enough
+ // approximation of 2^(32 + 20) / 10^7; see
+ // https://jk-jeon.github.io/posts/2022/12/fixed-precision-formatting/#fixed-length-case
+ // for details.
+ prod = ((subsegment * static_cast<uint64_t>(450359963)) >> 20) + 1;
+ digits = static_cast<uint32_t>(prod >> 32);
+ copy2(buffer, digits2(digits));
+ number_of_digits_printed += 2;
+ }
+
+ // Print all digit pairs.
+ while (number_of_digits_printed < number_of_digits_to_print) {
+ prod = static_cast<uint32_t>(prod) * static_cast<uint64_t>(100);
+ digits = static_cast<uint32_t>(prod >> 32);
+ copy2(buffer + number_of_digits_printed, digits2(digits));
+ number_of_digits_printed += 2;
+ }
+ };
+
+ // Print first subsegment.
+ print_subsegment(first_subsegment, buf.data());
+
+ // Perform rounding if the first subsegment is the last subsegment to
+ // print.
+ if (precision <= 9) {
+ // Rounding inside the subsegment.
+ // We round-up if:
+ // - either the fractional part is strictly larger than 1/2, or
+ // - the fractional part is exactly 1/2 and the last digit is odd.
+ // We rely on the following observations:
+ // - If fractional_part >= threshold, then the fractional part is
+ // strictly larger than 1/2.
+ // - If the MSB of fractional_part is set, then the fractional part
+ // must be at least 1/2.
+ // - When the MSB of fractional_part is set, either
+ // second_third_subsegments being nonzero or has_more_segments
+ // being true means there are further digits not printed, so the
+ // fractional part is strictly larger than 1/2.
+ if (precision < 9) {
+ uint32_t fractional_part = static_cast<uint32_t>(prod);
+ should_round_up =
+ fractional_part >= fractional_part_rounding_thresholds(
+ 8 - number_of_digits_to_print) ||
+ ((fractional_part >> 31) &
+ ((digits & 1) | (second_third_subsegments != 0) |
+ has_more_segments)) != 0;
+ }
+ // Rounding at the subsegment boundary.
+ // In this case, the fractional part is at least 1/2 if and only if
+ // second_third_subsegments >= 5000000000ULL, and is strictly larger
+ // than 1/2 if we further have either second_third_subsegments >
+ // 5000000000ULL or has_more_segments == true.
+ else {
+ should_round_up = second_third_subsegments > 5000000000ULL ||
+ (second_third_subsegments == 5000000000ULL &&
+ ((digits & 1) != 0 || has_more_segments));
+ }
+ }
+ // Otherwise, print the second subsegment.
+ else {
+ // Compilers are not aware of how to leverage the maximum value of
+ // second_third_subsegments to find out a better magic number which
+ // allows us to eliminate an additional shift. 1844674407370955162 =
+ // ceil(2^64/10) < ceil(2^64*(10^9/(10^10 - 1))).
+ const uint32_t second_subsegment =
+ static_cast<uint32_t>(dragonbox::umul128_upper64(
+ second_third_subsegments, 1844674407370955162ULL));
+ const uint32_t third_subsegment =
+ static_cast<uint32_t>(second_third_subsegments) -
+ second_subsegment * 10;
+
+ number_of_digits_to_print = precision - 9;
+ print_subsegment(second_subsegment, buf.data() + 9);
+
+ // Rounding inside the subsegment.
+ if (precision < 18) {
+ // The condition third_subsegment != 0 implies that the segment was
+ // of 19 digits, so in this case the third segment should be
+ // consisting of a genuine digit from the input.
+ uint32_t fractional_part = static_cast<uint32_t>(prod);
+ should_round_up =
+ fractional_part >= fractional_part_rounding_thresholds(
+ 8 - number_of_digits_to_print) ||
+ ((fractional_part >> 31) &
+ ((digits & 1) | (third_subsegment != 0) |
+ has_more_segments)) != 0;
+ }
+ // Rounding at the subsegment boundary.
+ else {
+ // In this case, the segment must be of 19 digits, thus
+ // the third subsegment should be consisting of a genuine digit from
+ // the input.
+ should_round_up = third_subsegment > 5 ||
+ (third_subsegment == 5 &&
+ ((digits & 1) != 0 || has_more_segments));
+ }
+ }
+
+ // Round-up if necessary.
+ if (should_round_up) {
+ ++buf[precision - 1];
+ for (int i = precision - 1; i > 0 && buf[i] > '9'; --i) {
+ buf[i] = '0';
+ ++buf[i - 1];
+ }
+ if (buf[0] > '9') {
+ buf[0] = '1';
+ if (fixed)
+ buf[precision++] = '0';
+ else
+ ++exp;
+ }
+ }
+ buf.try_resize(to_unsigned(precision));
+ }
+ } // if (digits_in_the_first_segment > precision)
+ else {
+ // Adjust the exponent for its use in Dragon4.
+ exp += digits_in_the_first_segment - 1;
+ }
+ }
+ if (use_dragon) {
+ auto f = basic_fp<uint128_t>();
+ bool is_predecessor_closer = specs.binary32
+ ? f.assign(static_cast<float>(value))
+ : f.assign(converted_value);
+ if (is_predecessor_closer) dragon_flags |= dragon::predecessor_closer;
+ if (fixed) dragon_flags |= dragon::fixed;
+ // Limit precision to the maximum possible number of significant digits in
+ // an IEEE754 double because we don't need to generate zeros.
+ const int max_double_digits = 767;
+ if (precision > max_double_digits) precision = max_double_digits;
+ format_dragon(f, dragon_flags, precision, buf, exp);
+ }
+ if (!fixed && !specs.showpoint) {
+ // Remove trailing zeros.
+ auto num_digits = buf.size();
+ while (num_digits > 0 && buf[num_digits - 1] == '0') {
+ --num_digits;
+ ++exp;
+ }
+ buf.try_resize(num_digits);
+ }
+ return exp;
+}
+template <typename Char, typename OutputIt, typename T>
+FMT_CONSTEXPR20 auto write_float(OutputIt out, T value,
+ format_specs<Char> specs, locale_ref loc)
+ -> OutputIt {
+ float_specs fspecs = parse_float_type_spec(specs);
+ fspecs.sign = specs.sign;
+ if (detail::signbit(value)) { // value < 0 is false for NaN so use signbit.
+ fspecs.sign = sign::minus;
+ value = -value;
+ } else if (fspecs.sign == sign::minus) {
+ fspecs.sign = sign::none;
+ }
+
+ if (!detail::isfinite(value))
+ return write_nonfinite(out, detail::isnan(value), specs, fspecs);
+
+ if (specs.align == align::numeric && fspecs.sign) {
+ auto it = reserve(out, 1);
+ *it++ = detail::sign<Char>(fspecs.sign);
+ out = base_iterator(out, it);
+ fspecs.sign = sign::none;
+ if (specs.width != 0) --specs.width;
+ }
+
+ memory_buffer buffer;
+ if (fspecs.format == float_format::hex) {
+ if (fspecs.sign) buffer.push_back(detail::sign<char>(fspecs.sign));
+ format_hexfloat(convert_float(value), specs.precision, fspecs, buffer);
+ return write_bytes<align::right>(out, {buffer.data(), buffer.size()},
+ specs);
+ }
+ int precision = specs.precision >= 0 || specs.type == presentation_type::none
+ ? specs.precision
+ : 6;
+ if (fspecs.format == float_format::exp) {
+ if (precision == max_value<int>())
+ throw_format_error("number is too big");
+ else
+ ++precision;
+ } else if (fspecs.format != float_format::fixed && precision == 0) {
+ precision = 1;
+ }
+ if (const_check(std::is_same<T, float>())) fspecs.binary32 = true;
+ int exp = format_float(convert_float(value), precision, fspecs, buffer);
+ fspecs.precision = precision;
+ auto f = big_decimal_fp{buffer.data(), static_cast<int>(buffer.size()), exp};
+ return write_float(out, f, specs, fspecs, loc);
+}
+
+template <typename Char, typename OutputIt, typename T,
+ FMT_ENABLE_IF(is_floating_point<T>::value)>
+FMT_CONSTEXPR20 auto write(OutputIt out, T value, format_specs<Char> specs,
+ locale_ref loc = {}) -> OutputIt {
+ if (const_check(!is_supported_floating_point(value))) return out;
+ return specs.localized && write_loc(out, value, specs, loc)
+ ? out
+ : write_float(out, value, specs, loc);
+}
+
+template <typename Char, typename OutputIt, typename T,
+ FMT_ENABLE_IF(is_fast_float<T>::value)>
+FMT_CONSTEXPR20 auto write(OutputIt out, T value) -> OutputIt {
+ if (is_constant_evaluated()) return write(out, value, format_specs<Char>());
+ if (const_check(!is_supported_floating_point(value))) return out;
+
+ auto fspecs = float_specs();
+ if (detail::signbit(value)) {
+ fspecs.sign = sign::minus;
+ value = -value;
+ }
+
+ constexpr auto specs = format_specs<Char>();
+ using floaty = conditional_t<std::is_same<T, long double>::value, double, T>;
+ using floaty_uint = typename dragonbox::float_info<floaty>::carrier_uint;
+ floaty_uint mask = exponent_mask<floaty>();
+ if ((bit_cast<floaty_uint>(value) & mask) == mask)
+ return write_nonfinite(out, std::isnan(value), specs, fspecs);
+
+ auto dec = dragonbox::to_decimal(static_cast<floaty>(value));
+ return write_float(out, dec, specs, fspecs, {});
+}
+
+template <typename Char, typename OutputIt, typename T,
+ FMT_ENABLE_IF(is_floating_point<T>::value &&
+ !is_fast_float<T>::value)>
+inline auto write(OutputIt out, T value) -> OutputIt {
+ return write(out, value, format_specs<Char>());
+}
+
+template <typename Char, typename OutputIt>
+auto write(OutputIt out, monostate, format_specs<Char> = {}, locale_ref = {})
+ -> OutputIt {
+ FMT_ASSERT(false, "");
+ return out;
+}
+
+template <typename Char, typename OutputIt>
+FMT_CONSTEXPR auto write(OutputIt out, basic_string_view<Char> value)
+ -> OutputIt {
+ auto it = reserve(out, value.size());
+ it = copy_str_noinline<Char>(value.begin(), value.end(), it);
+ return base_iterator(out, it);
+}
+
+template <typename Char, typename OutputIt, typename T,
+ FMT_ENABLE_IF(is_string<T>::value)>
+constexpr auto write(OutputIt out, const T& value) -> OutputIt {
+ return write<Char>(out, to_string_view(value));
+}
+
+// FMT_ENABLE_IF() condition separated to workaround an MSVC bug.
+template <
+ typename Char, typename OutputIt, typename T,
+ bool check =
+ std::is_enum<T>::value && !std::is_same<T, Char>::value &&
+ mapped_type_constant<T, basic_format_context<OutputIt, Char>>::value !=
+ type::custom_type,
+ FMT_ENABLE_IF(check)>
+FMT_CONSTEXPR auto write(OutputIt out, T value) -> OutputIt {
+ return write<Char>(out, static_cast<underlying_t<T>>(value));
+}
+
+template <typename Char, typename OutputIt, typename T,
+ FMT_ENABLE_IF(std::is_same<T, bool>::value)>
+FMT_CONSTEXPR auto write(OutputIt out, T value,
+ const format_specs<Char>& specs = {}, locale_ref = {})
+ -> OutputIt {
+ return specs.type != presentation_type::none &&
+ specs.type != presentation_type::string
+ ? write(out, value ? 1 : 0, specs, {})
+ : write_bytes(out, value ? "true" : "false", specs);
+}
+
+template <typename Char, typename OutputIt>
+FMT_CONSTEXPR auto write(OutputIt out, Char value) -> OutputIt {
+ auto it = reserve(out, 1);
+ *it++ = value;
+ return base_iterator(out, it);
+}
+
+template <typename Char, typename OutputIt>
+FMT_CONSTEXPR_CHAR_TRAITS auto write(OutputIt out, const Char* value)
+ -> OutputIt {
+ if (value) return write(out, basic_string_view<Char>(value));
+ throw_format_error("string pointer is null");
+ return out;
+}
+
+template <typename Char, typename OutputIt, typename T,
+ FMT_ENABLE_IF(std::is_same<T, void>::value)>
+auto write(OutputIt out, const T* value, const format_specs<Char>& specs = {},
+ locale_ref = {}) -> OutputIt {
+ return write_ptr<Char>(out, bit_cast<uintptr_t>(value), &specs);
+}
+
+// A write overload that handles implicit conversions.
+template <typename Char, typename OutputIt, typename T,
+ typename Context = basic_format_context<OutputIt, Char>>
+FMT_CONSTEXPR auto write(OutputIt out, const T& value) -> enable_if_t<
+ std::is_class<T>::value && !is_string<T>::value &&
+ !is_floating_point<T>::value && !std::is_same<T, Char>::value &&
+ !std::is_same<T, remove_cvref_t<decltype(arg_mapper<Context>().map(
+ value))>>::value,
+ OutputIt> {
+ return write<Char>(out, arg_mapper<Context>().map(value));
+}
+
+template <typename Char, typename OutputIt, typename T,
+ typename Context = basic_format_context<OutputIt, Char>>
+FMT_CONSTEXPR auto write(OutputIt out, const T& value)
+ -> enable_if_t<mapped_type_constant<T, Context>::value == type::custom_type,
+ OutputIt> {
+ auto formatter = typename Context::template formatter_type<T>();
+ auto parse_ctx = typename Context::parse_context_type({});
+ formatter.parse(parse_ctx);
+ auto ctx = Context(out, {}, {});
+ return formatter.format(value, ctx);
+}
+
+// An argument visitor that formats the argument and writes it via the output
+// iterator. It's a class and not a generic lambda for compatibility with C++11.
+template <typename Char> struct default_arg_formatter {
+ using iterator = buffer_appender<Char>;
+ using context = buffer_context<Char>;
+
+ iterator out;
+ basic_format_args<context> args;
+ locale_ref loc;
+
+ template <typename T> auto operator()(T value) -> iterator {
+ return write<Char>(out, value);
+ }
+ auto operator()(typename basic_format_arg<context>::handle h) -> iterator {
+ basic_format_parse_context<Char> parse_ctx({});
+ context format_ctx(out, args, loc);
+ h.format(parse_ctx, format_ctx);
+ return format_ctx.out();
+ }
+};
+
+template <typename Char> struct arg_formatter {
+ using iterator = buffer_appender<Char>;
+ using context = buffer_context<Char>;
+
+ iterator out;
+ const format_specs<Char>& specs;
+ locale_ref locale;
+
+ template <typename T>
+ FMT_CONSTEXPR FMT_INLINE auto operator()(T value) -> iterator {
+ return detail::write(out, value, specs, locale);
+ }
+ auto operator()(typename basic_format_arg<context>::handle) -> iterator {
+ // User-defined types are handled separately because they require access
+ // to the parse context.
+ return out;
+ }
+};
+
+struct width_checker {
+ template <typename T, FMT_ENABLE_IF(is_integer<T>::value)>
+ FMT_CONSTEXPR auto operator()(T value) -> unsigned long long {
+ if (is_negative(value)) throw_format_error("negative width");
+ return static_cast<unsigned long long>(value);
+ }
+
+ template <typename T, FMT_ENABLE_IF(!is_integer<T>::value)>
+ FMT_CONSTEXPR auto operator()(T) -> unsigned long long {
+ throw_format_error("width is not integer");
+ return 0;
+ }
+};
+
+struct precision_checker {
+ template <typename T, FMT_ENABLE_IF(is_integer<T>::value)>
+ FMT_CONSTEXPR auto operator()(T value) -> unsigned long long {
+ if (is_negative(value)) throw_format_error("negative precision");
+ return static_cast<unsigned long long>(value);
+ }
+
+ template <typename T, FMT_ENABLE_IF(!is_integer<T>::value)>
+ FMT_CONSTEXPR auto operator()(T) -> unsigned long long {
+ throw_format_error("precision is not integer");
+ return 0;
+ }
+};
+
+template <typename Handler, typename FormatArg>
+FMT_CONSTEXPR auto get_dynamic_spec(FormatArg arg) -> int {
+ unsigned long long value = visit_format_arg(Handler(), arg);
+ if (value > to_unsigned(max_value<int>()))
+ throw_format_error("number is too big");
+ return static_cast<int>(value);
+}
+
+template <typename Context, typename ID>
+FMT_CONSTEXPR auto get_arg(Context& ctx, ID id) -> decltype(ctx.arg(id)) {
+ auto arg = ctx.arg(id);
+ if (!arg) ctx.on_error("argument not found");
+ return arg;
+}
+
+template <typename Handler, typename Context>
+FMT_CONSTEXPR void handle_dynamic_spec(int& value,
+ arg_ref<typename Context::char_type> ref,
+ Context& ctx) {
+ switch (ref.kind) {
+ case arg_id_kind::none:
+ break;
+ case arg_id_kind::index:
+ value = detail::get_dynamic_spec<Handler>(get_arg(ctx, ref.val.index));
+ break;
+ case arg_id_kind::name:
+ value = detail::get_dynamic_spec<Handler>(get_arg(ctx, ref.val.name));
+ break;
+ }
+}
+
+#if FMT_USE_USER_DEFINED_LITERALS
+# if FMT_USE_NONTYPE_TEMPLATE_ARGS
+template <typename T, typename Char, size_t N,
+ fmt::detail_exported::fixed_string<Char, N> Str>
+struct statically_named_arg : view {
+ static constexpr auto name = Str.data;
+
+ const T& value;
+ statically_named_arg(const T& v) : value(v) {}
+};
+
+template <typename T, typename Char, size_t N,
+ fmt::detail_exported::fixed_string<Char, N> Str>
+struct is_named_arg<statically_named_arg<T, Char, N, Str>> : std::true_type {};
+
+template <typename T, typename Char, size_t N,
+ fmt::detail_exported::fixed_string<Char, N> Str>
+struct is_statically_named_arg<statically_named_arg<T, Char, N, Str>>
+ : std::true_type {};
+
+template <typename Char, size_t N,
+ fmt::detail_exported::fixed_string<Char, N> Str>
+struct udl_arg {
+ template <typename T> auto operator=(T&& value) const {
+ return statically_named_arg<T, Char, N, Str>(std::forward<T>(value));
+ }
+};
+# else
+template <typename Char> struct udl_arg {
+ const Char* str;
+
+ template <typename T> auto operator=(T&& value) const -> named_arg<Char, T> {
+ return {str, std::forward<T>(value)};
+ }
+};
+# endif
+#endif // FMT_USE_USER_DEFINED_LITERALS
+
+template <typename Locale, typename Char>
+auto vformat(const Locale& loc, basic_string_view<Char> fmt,
+ basic_format_args<buffer_context<type_identity_t<Char>>> args)
+ -> std::basic_string<Char> {
+ auto buf = basic_memory_buffer<Char>();
+ detail::vformat_to(buf, fmt, args, detail::locale_ref(loc));
+ return {buf.data(), buf.size()};
+}
+
+using format_func = void (*)(detail::buffer<char>&, int, const char*);
+
+FMT_API void format_error_code(buffer<char>& out, int error_code,
+ string_view message) noexcept;
+
+FMT_API void report_error(format_func func, int error_code,
+ const char* message) noexcept;
+} // namespace detail
+
+FMT_API auto vsystem_error(int error_code, string_view format_str,
+ format_args args) -> std::system_error;
+
+/**
+ \rst
+ Constructs :class:`std::system_error` with a message formatted with
+ ``fmt::format(fmt, args...)``.
+ *error_code* is a system error code as given by ``errno``.
+
+ **Example**::
+
+ // This throws std::system_error with the description
+ // cannot open file 'madeup': No such file or directory
+ // or similar (system message may vary).
+ const char* filename = "madeup";
+ std::FILE* file = std::fopen(filename, "r");
+ if (!file)
+ throw fmt::system_error(errno, "cannot open file '{}'", filename);
+ \endrst
+ */
+template <typename... T>
+auto system_error(int error_code, format_string<T...> fmt, T&&... args)
+ -> std::system_error {
+ return vsystem_error(error_code, fmt, fmt::make_format_args(args...));
+}
+
+/**
+ \rst
+ Formats an error message for an error returned by an operating system or a
+ language runtime, for example a file opening error, and writes it to *out*.
+ The format is the same as the one used by ``std::system_error(ec, message)``
+ where ``ec`` is ``std::error_code(error_code, std::generic_category()})``.
+ It is implementation-defined but normally looks like:
+
+ .. parsed-literal::
+ *<message>*: *<system-message>*
+
+ where *<message>* is the passed message and *<system-message>* is the system
+ message corresponding to the error code.
+ *error_code* is a system error code as given by ``errno``.
+ \endrst
+ */
+FMT_API void format_system_error(detail::buffer<char>& out, int error_code,
+ const char* message) noexcept;
+
+// Reports a system error without throwing an exception.
+// Can be used to report errors from destructors.
+FMT_API void report_system_error(int error_code, const char* message) noexcept;
+
+/** Fast integer formatter. */
+class format_int {
+ private:
+ // Buffer should be large enough to hold all digits (digits10 + 1),
+ // a sign and a null character.
+ enum { buffer_size = std::numeric_limits<unsigned long long>::digits10 + 3 };
+ mutable char buffer_[buffer_size];
+ char* str_;
+
+ template <typename UInt> auto format_unsigned(UInt value) -> char* {
+ auto n = static_cast<detail::uint32_or_64_or_128_t<UInt>>(value);
+ return detail::format_decimal(buffer_, n, buffer_size - 1).begin;
+ }
+
+ template <typename Int> auto format_signed(Int value) -> char* {
+ auto abs_value = static_cast<detail::uint32_or_64_or_128_t<Int>>(value);
+ bool negative = value < 0;
+ if (negative) abs_value = 0 - abs_value;
+ auto begin = format_unsigned(abs_value);
+ if (negative) *--begin = '-';
+ return begin;
+ }
+
+ public:
+ explicit format_int(int value) : str_(format_signed(value)) {}
+ explicit format_int(long value) : str_(format_signed(value)) {}
+ explicit format_int(long long value) : str_(format_signed(value)) {}
+ explicit format_int(unsigned value) : str_(format_unsigned(value)) {}
+ explicit format_int(unsigned long value) : str_(format_unsigned(value)) {}
+ explicit format_int(unsigned long long value)
+ : str_(format_unsigned(value)) {}
+
+ /** Returns the number of characters written to the output buffer. */
+ auto size() const -> size_t {
+ return detail::to_unsigned(buffer_ - str_ + buffer_size - 1);
+ }
+
+ /**
+ Returns a pointer to the output buffer content. No terminating null
+ character is appended.
+ */
+ auto data() const -> const char* { return str_; }
+
+ /**
+ Returns a pointer to the output buffer content with terminating null
+ character appended.
+ */
+ auto c_str() const -> const char* {
+ buffer_[buffer_size - 1] = '\0';
+ return str_;
+ }
+
+ /**
+ \rst
+ Returns the content of the output buffer as an ``std::string``.
+ \endrst
+ */
+ auto str() const -> std::string { return std::string(str_, size()); }
+};
+
+template <typename T, typename Char>
+struct formatter<T, Char, enable_if_t<detail::has_format_as<T>::value>>
+ : formatter<detail::format_as_t<T>, Char> {
+ template <typename FormatContext>
+ auto format(const T& value, FormatContext& ctx) const -> decltype(ctx.out()) {
+ using base = formatter<detail::format_as_t<T>, Char>;
+ return base::format(format_as(value), ctx);
+ }
+};
+
+#define FMT_FORMAT_AS(Type, Base) \
+ template <typename Char> \
+ struct formatter<Type, Char> : formatter<Base, Char> {}
+
+FMT_FORMAT_AS(signed char, int);
+FMT_FORMAT_AS(unsigned char, unsigned);
+FMT_FORMAT_AS(short, int);
+FMT_FORMAT_AS(unsigned short, unsigned);
+FMT_FORMAT_AS(long, detail::long_type);
+FMT_FORMAT_AS(unsigned long, detail::ulong_type);
+FMT_FORMAT_AS(Char*, const Char*);
+FMT_FORMAT_AS(std::basic_string<Char>, basic_string_view<Char>);
+FMT_FORMAT_AS(std::nullptr_t, const void*);
+FMT_FORMAT_AS(detail::std_string_view<Char>, basic_string_view<Char>);
+FMT_FORMAT_AS(void*, const void*);
+
+template <typename Char, size_t N>
+struct formatter<Char[N], Char> : formatter<basic_string_view<Char>, Char> {};
+
+/**
+ \rst
+ Converts ``p`` to ``const void*`` for pointer formatting.
+
+ **Example**::
+
+ auto s = fmt::format("{}", fmt::ptr(p));
+ \endrst
+ */
+template <typename T> auto ptr(T p) -> const void* {
+ static_assert(std::is_pointer<T>::value, "");
+ return detail::bit_cast<const void*>(p);
+}
+template <typename T, typename Deleter>
+auto ptr(const std::unique_ptr<T, Deleter>& p) -> const void* {
+ return p.get();
+}
+template <typename T> auto ptr(const std::shared_ptr<T>& p) -> const void* {
+ return p.get();
+}
+
+/**
+ \rst
+ Converts ``e`` to the underlying type.
+
+ **Example**::
+
+ enum class color { red, green, blue };
+ auto s = fmt::format("{}", fmt::underlying(color::red));
+ \endrst
+ */
+template <typename Enum>
+constexpr auto underlying(Enum e) noexcept -> underlying_t<Enum> {
+ return static_cast<underlying_t<Enum>>(e);
+}
+
+namespace enums {
+template <typename Enum, FMT_ENABLE_IF(std::is_enum<Enum>::value)>
+constexpr auto format_as(Enum e) noexcept -> underlying_t<Enum> {
+ return static_cast<underlying_t<Enum>>(e);
+}
+} // namespace enums
+
+class bytes {
+ private:
+ string_view data_;
+ friend struct formatter<bytes>;
+
+ public:
+ explicit bytes(string_view data) : data_(data) {}
+};
+
+template <> struct formatter<bytes> {
+ private:
+ detail::dynamic_format_specs<> specs_;
+
+ public:
+ template <typename ParseContext>
+ FMT_CONSTEXPR auto parse(ParseContext& ctx) -> const char* {
+ return parse_format_specs(ctx.begin(), ctx.end(), specs_, ctx,
+ detail::type::string_type);
+ }
+
+ template <typename FormatContext>
+ auto format(bytes b, FormatContext& ctx) -> decltype(ctx.out()) {
+ detail::handle_dynamic_spec<detail::width_checker>(specs_.width,
+ specs_.width_ref, ctx);
+ detail::handle_dynamic_spec<detail::precision_checker>(
+ specs_.precision, specs_.precision_ref, ctx);
+ return detail::write_bytes(ctx.out(), b.data_, specs_);
+ }
+};
+
+// group_digits_view is not derived from view because it copies the argument.
+template <typename T> struct group_digits_view {
+ T value;
+};
+
+/**
+ \rst
+ Returns a view that formats an integer value using ',' as a locale-independent
+ thousands separator.
+
+ **Example**::
+
+ fmt::print("{}", fmt::group_digits(12345));
+ // Output: "12,345"
+ \endrst
+ */
+template <typename T> auto group_digits(T value) -> group_digits_view<T> {
+ return {value};
+}
+
+template <typename T> struct formatter<group_digits_view<T>> : formatter<T> {
+ private:
+ detail::dynamic_format_specs<> specs_;
+
+ public:
+ template <typename ParseContext>
+ FMT_CONSTEXPR auto parse(ParseContext& ctx) -> const char* {
+ return parse_format_specs(ctx.begin(), ctx.end(), specs_, ctx,
+ detail::type::int_type);
+ }
+
+ template <typename FormatContext>
+ auto format(group_digits_view<T> t, FormatContext& ctx)
+ -> decltype(ctx.out()) {
+ detail::handle_dynamic_spec<detail::width_checker>(specs_.width,
+ specs_.width_ref, ctx);
+ detail::handle_dynamic_spec<detail::precision_checker>(
+ specs_.precision, specs_.precision_ref, ctx);
+ return detail::write_int(
+ ctx.out(), static_cast<detail::uint64_or_128_t<T>>(t.value), 0, specs_,
+ detail::digit_grouping<char>("\3", ","));
+ }
+};
+
+template <typename T> struct nested_view {
+ const formatter<T>* fmt;
+ const T* value;
+};
+
+template <typename T> struct formatter<nested_view<T>> {
+ FMT_CONSTEXPR auto parse(format_parse_context& ctx) -> const char* {
+ return ctx.begin();
+ }
+ auto format(nested_view<T> view, format_context& ctx) const
+ -> decltype(ctx.out()) {
+ return view.fmt->format(*view.value, ctx);
+ }
+};
+
+template <typename T> struct nested_formatter {
+ private:
+ int width_;
+ detail::fill_t<char> fill_;
+ align_t align_ : 4;
+ formatter<T> formatter_;
+
+ public:
+ constexpr nested_formatter() : width_(0), align_(align_t::none) {}
+
+ FMT_CONSTEXPR auto parse(format_parse_context& ctx) -> const char* {
+ auto specs = detail::dynamic_format_specs<char>();
+ auto it = parse_format_specs(ctx.begin(), ctx.end(), specs, ctx,
+ detail::type::none_type);
+ width_ = specs.width;
+ fill_ = specs.fill;
+ align_ = specs.align;
+ ctx.advance_to(it);
+ return formatter_.parse(ctx);
+ }
+
+ template <typename F>
+ auto write_padded(format_context& ctx, F write) const -> decltype(ctx.out()) {
+ if (width_ == 0) return write(ctx.out());
+ auto buf = memory_buffer();
+ write(std::back_inserter(buf));
+ auto specs = format_specs<>();
+ specs.width = width_;
+ specs.fill = fill_;
+ specs.align = align_;
+ return detail::write(ctx.out(), string_view(buf.data(), buf.size()), specs);
+ }
+
+ auto nested(const T& value) const -> nested_view<T> {
+ return nested_view<T>{&formatter_, &value};
+ }
+};
+
+// DEPRECATED! join_view will be moved to ranges.h.
+template <typename It, typename Sentinel, typename Char = char>
+struct join_view : detail::view {
+ It begin;
+ Sentinel end;
+ basic_string_view<Char> sep;
+
+ join_view(It b, Sentinel e, basic_string_view<Char> s)
+ : begin(b), end(e), sep(s) {}
+};
+
+template <typename It, typename Sentinel, typename Char>
+struct formatter<join_view<It, Sentinel, Char>, Char> {
+ private:
+ using value_type =
+#ifdef __cpp_lib_ranges
+ std::iter_value_t<It>;
+#else
+ typename std::iterator_traits<It>::value_type;
+#endif
+ formatter<remove_cvref_t<value_type>, Char> value_formatter_;
+
+ public:
+ template <typename ParseContext>
+ FMT_CONSTEXPR auto parse(ParseContext& ctx) -> const Char* {
+ return value_formatter_.parse(ctx);
+ }
+
+ template <typename FormatContext>
+ auto format(const join_view<It, Sentinel, Char>& value,
+ FormatContext& ctx) const -> decltype(ctx.out()) {
+ auto it = value.begin;
+ auto out = ctx.out();
+ if (it != value.end) {
+ out = value_formatter_.format(*it, ctx);
+ ++it;
+ while (it != value.end) {
+ out = detail::copy_str<Char>(value.sep.begin(), value.sep.end(), out);
+ ctx.advance_to(out);
+ out = value_formatter_.format(*it, ctx);
+ ++it;
+ }
+ }
+ return out;
+ }
+};
+
+/**
+ Returns a view that formats the iterator range `[begin, end)` with elements
+ separated by `sep`.
+ */
+template <typename It, typename Sentinel>
+auto join(It begin, Sentinel end, string_view sep) -> join_view<It, Sentinel> {
+ return {begin, end, sep};
+}
+
+/**
+ \rst
+ Returns a view that formats `range` with elements separated by `sep`.
+
+ **Example**::
+
+ std::vector<int> v = {1, 2, 3};
+ fmt::print("{}", fmt::join(v, ", "));
+ // Output: "1, 2, 3"
+
+ ``fmt::join`` applies passed format specifiers to the range elements::
+
+ fmt::print("{:02}", fmt::join(v, ", "));
+ // Output: "01, 02, 03"
+ \endrst
+ */
+template <typename Range>
+auto join(Range&& range, string_view sep)
+ -> join_view<detail::iterator_t<Range>, detail::sentinel_t<Range>> {
+ return join(std::begin(range), std::end(range), sep);
+}
+
+/**
+ \rst
+ Converts *value* to ``std::string`` using the default format for type *T*.
+
+ **Example**::
+
+ #include <fmt/format.h>
+
+ std::string answer = fmt::to_string(42);
+ \endrst
+ */
+template <typename T, FMT_ENABLE_IF(!std::is_integral<T>::value &&
+ !detail::has_format_as<T>::value)>
+inline auto to_string(const T& value) -> std::string {
+ auto buffer = memory_buffer();
+ detail::write<char>(appender(buffer), value);
+ return {buffer.data(), buffer.size()};
+}
+
+template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)>
+FMT_NODISCARD inline auto to_string(T value) -> std::string {
+ // The buffer should be large enough to store the number including the sign
+ // or "false" for bool.
+ constexpr int max_size = detail::digits10<T>() + 2;
+ char buffer[max_size > 5 ? static_cast<unsigned>(max_size) : 5];
+ char* begin = buffer;
+ return std::string(begin, detail::write<char>(begin, value));
+}
+
+template <typename Char, size_t SIZE>
+FMT_NODISCARD auto to_string(const basic_memory_buffer<Char, SIZE>& buf)
+ -> std::basic_string<Char> {
+ auto size = buf.size();
+ detail::assume(size < std::basic_string<Char>().max_size());
+ return std::basic_string<Char>(buf.data(), size);
+}
+
+template <typename T, FMT_ENABLE_IF(!std::is_integral<T>::value &&
+ detail::has_format_as<T>::value)>
+inline auto to_string(const T& value) -> std::string {
+ return to_string(format_as(value));
+}
+
+FMT_END_EXPORT
+
+namespace detail {
+
+template <typename Char>
+void vformat_to(buffer<Char>& buf, basic_string_view<Char> fmt,
+ typename vformat_args<Char>::type args, locale_ref loc) {
+ auto out = buffer_appender<Char>(buf);
+ if (fmt.size() == 2 && equal2(fmt.data(), "{}")) {
+ auto arg = args.get(0);
+ if (!arg) throw_format_error("argument not found");
+ visit_format_arg(default_arg_formatter<Char>{out, args, loc}, arg);
+ return;
+ }
+
+ struct format_handler : error_handler {
+ basic_format_parse_context<Char> parse_context;
+ buffer_context<Char> context;
+
+ format_handler(buffer_appender<Char> p_out, basic_string_view<Char> str,
+ basic_format_args<buffer_context<Char>> p_args,
+ locale_ref p_loc)
+ : parse_context(str), context(p_out, p_args, p_loc) {}
+
+ void on_text(const Char* begin, const Char* end) {
+ auto text = basic_string_view<Char>(begin, to_unsigned(end - begin));
+ context.advance_to(write<Char>(context.out(), text));
+ }
+
+ FMT_CONSTEXPR auto on_arg_id() -> int {
+ return parse_context.next_arg_id();
+ }
+ FMT_CONSTEXPR auto on_arg_id(int id) -> int {
+ return parse_context.check_arg_id(id), id;
+ }
+ FMT_CONSTEXPR auto on_arg_id(basic_string_view<Char> id) -> int {
+ int arg_id = context.arg_id(id);
+ if (arg_id < 0) throw_format_error("argument not found");
+ return arg_id;
+ }
+
+ FMT_INLINE void on_replacement_field(int id, const Char*) {
+ auto arg = get_arg(context, id);
+ context.advance_to(visit_format_arg(
+ default_arg_formatter<Char>{context.out(), context.args(),
+ context.locale()},
+ arg));
+ }
+
+ auto on_format_specs(int id, const Char* begin, const Char* end)
+ -> const Char* {
+ auto arg = get_arg(context, id);
+ // Not using a visitor for custom types gives better codegen.
+ if (arg.format_custom(begin, parse_context, context))
+ return parse_context.begin();
+ auto specs = detail::dynamic_format_specs<Char>();
+ begin = parse_format_specs(begin, end, specs, parse_context, arg.type());
+ detail::handle_dynamic_spec<detail::width_checker>(
+ specs.width, specs.width_ref, context);
+ detail::handle_dynamic_spec<detail::precision_checker>(
+ specs.precision, specs.precision_ref, context);
+ if (begin == end || *begin != '}')
+ throw_format_error("missing '}' in format string");
+ auto f = arg_formatter<Char>{context.out(), specs, context.locale()};
+ context.advance_to(visit_format_arg(f, arg));
+ return begin;
+ }
+ };
+ detail::parse_format_string<false>(fmt, format_handler(out, fmt, args, loc));
+}
+
+FMT_BEGIN_EXPORT
+
+#ifndef FMT_HEADER_ONLY
+extern template FMT_API void vformat_to(buffer<char>&, string_view,
+ typename vformat_args<>::type,
+ locale_ref);
+extern template FMT_API auto thousands_sep_impl<char>(locale_ref)
+ -> thousands_sep_result<char>;
+extern template FMT_API auto thousands_sep_impl<wchar_t>(locale_ref)
+ -> thousands_sep_result<wchar_t>;
+extern template FMT_API auto decimal_point_impl(locale_ref) -> char;
+extern template FMT_API auto decimal_point_impl(locale_ref) -> wchar_t;
+#endif // FMT_HEADER_ONLY
+
+} // namespace detail
+
+#if FMT_USE_USER_DEFINED_LITERALS
+inline namespace literals {
+/**
+ \rst
+ User-defined literal equivalent of :func:`fmt::arg`.
+
+ **Example**::
+
+ using namespace fmt::literals;
+ fmt::print("Elapsed time: {s:.2f} seconds", "s"_a=1.23);
+ \endrst
+ */
+# if FMT_USE_NONTYPE_TEMPLATE_ARGS
+template <detail_exported::fixed_string Str> constexpr auto operator""_a() {
+ using char_t = remove_cvref_t<decltype(Str.data[0])>;
+ return detail::udl_arg<char_t, sizeof(Str.data) / sizeof(char_t), Str>();
+}
+# else
+constexpr auto operator""_a(const char* s, size_t) -> detail::udl_arg<char> {
+ return {s};
+}
+# endif
+} // namespace literals
+#endif // FMT_USE_USER_DEFINED_LITERALS
+
+template <typename Locale, FMT_ENABLE_IF(detail::is_locale<Locale>::value)>
+inline auto vformat(const Locale& loc, string_view fmt, format_args args)
+ -> std::string {
+ return detail::vformat(loc, fmt, args);
+}
+
+template <typename Locale, typename... T,
+ FMT_ENABLE_IF(detail::is_locale<Locale>::value)>
+inline auto format(const Locale& loc, format_string<T...> fmt, T&&... args)
+ -> std::string {
+ return fmt::vformat(loc, string_view(fmt), fmt::make_format_args(args...));
+}
+
+template <typename OutputIt, typename Locale,
+ FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value&&
+ detail::is_locale<Locale>::value)>
+auto vformat_to(OutputIt out, const Locale& loc, string_view fmt,
+ format_args args) -> OutputIt {
+ using detail::get_buffer;
+ auto&& buf = get_buffer<char>(out);
+ detail::vformat_to(buf, fmt, args, detail::locale_ref(loc));
+ return detail::get_iterator(buf, out);
+}
+
+template <typename OutputIt, typename Locale, typename... T,
+ FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value&&
+ detail::is_locale<Locale>::value)>
+FMT_INLINE auto format_to(OutputIt out, const Locale& loc,
+ format_string<T...> fmt, T&&... args) -> OutputIt {
+ return vformat_to(out, loc, fmt, fmt::make_format_args(args...));
+}
+
+template <typename Locale, typename... T,
+ FMT_ENABLE_IF(detail::is_locale<Locale>::value)>
+FMT_NODISCARD FMT_INLINE auto formatted_size(const Locale& loc,
+ format_string<T...> fmt,
+ T&&... args) -> size_t {
+ auto buf = detail::counting_buffer<>();
+ detail::vformat_to<char>(buf, fmt, fmt::make_format_args(args...),
+ detail::locale_ref(loc));
+ return buf.count();
+}
+
+FMT_END_EXPORT
+
+template <typename T, typename Char>
+template <typename FormatContext>
+FMT_CONSTEXPR FMT_INLINE auto
+formatter<T, Char,
+ enable_if_t<detail::type_constant<T, Char>::value !=
+ detail::type::custom_type>>::format(const T& val,
+ FormatContext& ctx)
+ const -> decltype(ctx.out()) {
+ if (specs_.width_ref.kind == detail::arg_id_kind::none &&
+ specs_.precision_ref.kind == detail::arg_id_kind::none) {
+ return detail::write<Char>(ctx.out(), val, specs_, ctx.locale());
+ }
+ auto specs = specs_;
+ detail::handle_dynamic_spec<detail::width_checker>(specs.width,
+ specs.width_ref, ctx);
+ detail::handle_dynamic_spec<detail::precision_checker>(
+ specs.precision, specs.precision_ref, ctx);
+ return detail::write<Char>(ctx.out(), val, specs, ctx.locale());
+}
+
+FMT_END_NAMESPACE
+
+#ifdef FMT_HEADER_ONLY
+# define FMT_FUNC inline
+# include "format-inl.h"
+#else
+# define FMT_FUNC
+#endif
+
+#endif // FMT_FORMAT_H_
--- /dev/null
+// Formatting library for C++ - std::ostream support
+//
+// Copyright (c) 2012 - present, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#ifndef FMT_OSTREAM_H_
+#define FMT_OSTREAM_H_
+
+#include <fstream> // std::filebuf
+
+#ifdef _WIN32
+# ifdef __GLIBCXX__
+# include <ext/stdio_filebuf.h>
+# include <ext/stdio_sync_filebuf.h>
+# endif
+# include <io.h>
+#endif
+
+#include "format.h"
+
+FMT_BEGIN_NAMESPACE
+namespace detail {
+
+template <typename Streambuf> class formatbuf : public Streambuf {
+ private:
+ using char_type = typename Streambuf::char_type;
+ using streamsize = decltype(std::declval<Streambuf>().sputn(nullptr, 0));
+ using int_type = typename Streambuf::int_type;
+ using traits_type = typename Streambuf::traits_type;
+
+ buffer<char_type>& buffer_;
+
+ public:
+ explicit formatbuf(buffer<char_type>& buf) : buffer_(buf) {}
+
+ protected:
+ // The put area is always empty. This makes the implementation simpler and has
+ // the advantage that the streambuf and the buffer are always in sync and
+ // sputc never writes into uninitialized memory. A disadvantage is that each
+ // call to sputc always results in a (virtual) call to overflow. There is no
+ // disadvantage here for sputn since this always results in a call to xsputn.
+
+ auto overflow(int_type ch) -> int_type override {
+ if (!traits_type::eq_int_type(ch, traits_type::eof()))
+ buffer_.push_back(static_cast<char_type>(ch));
+ return ch;
+ }
+
+ auto xsputn(const char_type* s, streamsize count) -> streamsize override {
+ buffer_.append(s, s + count);
+ return count;
+ }
+};
+
+// Generate a unique explicit instantion in every translation unit using a tag
+// type in an anonymous namespace.
+namespace {
+struct file_access_tag {};
+} // namespace
+template <typename Tag, typename BufType, FILE* BufType::*FileMemberPtr>
+class file_access {
+ friend auto get_file(BufType& obj) -> FILE* { return obj.*FileMemberPtr; }
+};
+
+#if FMT_MSC_VERSION
+template class file_access<file_access_tag, std::filebuf,
+ &std::filebuf::_Myfile>;
+auto get_file(std::filebuf&) -> FILE*;
+#endif
+
+inline auto write_ostream_unicode(std::ostream& os, fmt::string_view data)
+ -> bool {
+ FILE* f = nullptr;
+#if FMT_MSC_VERSION
+ if (auto* buf = dynamic_cast<std::filebuf*>(os.rdbuf()))
+ f = get_file(*buf);
+ else
+ return false;
+#elif defined(_WIN32) && defined(__GLIBCXX__)
+ auto* rdbuf = os.rdbuf();
+ if (auto* sfbuf = dynamic_cast<__gnu_cxx::stdio_sync_filebuf<char>*>(rdbuf))
+ f = sfbuf->file();
+ else if (auto* fbuf = dynamic_cast<__gnu_cxx::stdio_filebuf<char>*>(rdbuf))
+ f = fbuf->file();
+ else
+ return false;
+#else
+ ignore_unused(os, data, f);
+#endif
+#ifdef _WIN32
+ if (f) {
+ int fd = _fileno(f);
+ if (_isatty(fd)) {
+ os.flush();
+ return write_console(fd, data);
+ }
+ }
+#endif
+ return false;
+}
+inline auto write_ostream_unicode(std::wostream&,
+ fmt::basic_string_view<wchar_t>) -> bool {
+ return false;
+}
+
+// Write the content of buf to os.
+// It is a separate function rather than a part of vprint to simplify testing.
+template <typename Char>
+void write_buffer(std::basic_ostream<Char>& os, buffer<Char>& buf) {
+ const Char* buf_data = buf.data();
+ using unsigned_streamsize = std::make_unsigned<std::streamsize>::type;
+ unsigned_streamsize size = buf.size();
+ unsigned_streamsize max_size = to_unsigned(max_value<std::streamsize>());
+ do {
+ unsigned_streamsize n = size <= max_size ? size : max_size;
+ os.write(buf_data, static_cast<std::streamsize>(n));
+ buf_data += n;
+ size -= n;
+ } while (size != 0);
+}
+
+template <typename Char, typename T>
+void format_value(buffer<Char>& buf, const T& value) {
+ auto&& format_buf = formatbuf<std::basic_streambuf<Char>>(buf);
+ auto&& output = std::basic_ostream<Char>(&format_buf);
+#if !defined(FMT_STATIC_THOUSANDS_SEPARATOR)
+ output.imbue(std::locale::classic()); // The default is always unlocalized.
+#endif
+ output << value;
+ output.exceptions(std::ios_base::failbit | std::ios_base::badbit);
+}
+
+template <typename T> struct streamed_view {
+ const T& value;
+};
+
+} // namespace detail
+
+// Formats an object of type T that has an overloaded ostream operator<<.
+template <typename Char>
+struct basic_ostream_formatter : formatter<basic_string_view<Char>, Char> {
+ void set_debug_format() = delete;
+
+ template <typename T, typename OutputIt>
+ auto format(const T& value, basic_format_context<OutputIt, Char>& ctx) const
+ -> OutputIt {
+ auto buffer = basic_memory_buffer<Char>();
+ detail::format_value(buffer, value);
+ return formatter<basic_string_view<Char>, Char>::format(
+ {buffer.data(), buffer.size()}, ctx);
+ }
+};
+
+using ostream_formatter = basic_ostream_formatter<char>;
+
+template <typename T, typename Char>
+struct formatter<detail::streamed_view<T>, Char>
+ : basic_ostream_formatter<Char> {
+ template <typename OutputIt>
+ auto format(detail::streamed_view<T> view,
+ basic_format_context<OutputIt, Char>& ctx) const -> OutputIt {
+ return basic_ostream_formatter<Char>::format(view.value, ctx);
+ }
+};
+
+/**
+ \rst
+ Returns a view that formats `value` via an ostream ``operator<<``.
+
+ **Example**::
+
+ fmt::print("Current thread id: {}\n",
+ fmt::streamed(std::this_thread::get_id()));
+ \endrst
+ */
+template <typename T>
+constexpr auto streamed(const T& value) -> detail::streamed_view<T> {
+ return {value};
+}
+
+namespace detail {
+
+inline void vprint_directly(std::ostream& os, string_view format_str,
+ format_args args) {
+ auto buffer = memory_buffer();
+ detail::vformat_to(buffer, format_str, args);
+ detail::write_buffer(os, buffer);
+}
+
+} // namespace detail
+
+FMT_EXPORT template <typename Char>
+void vprint(std::basic_ostream<Char>& os,
+ basic_string_view<type_identity_t<Char>> format_str,
+ basic_format_args<buffer_context<type_identity_t<Char>>> args) {
+ auto buffer = basic_memory_buffer<Char>();
+ detail::vformat_to(buffer, format_str, args);
+ if (detail::write_ostream_unicode(os, {buffer.data(), buffer.size()})) return;
+ detail::write_buffer(os, buffer);
+}
+
+/**
+ \rst
+ Prints formatted data to the stream *os*.
+
+ **Example**::
+
+ fmt::print(cerr, "Don't {}!", "panic");
+ \endrst
+ */
+FMT_EXPORT template <typename... T>
+void print(std::ostream& os, format_string<T...> fmt, T&&... args) {
+ const auto& vargs = fmt::make_format_args(args...);
+ if (detail::is_utf8())
+ vprint(os, fmt, vargs);
+ else
+ detail::vprint_directly(os, fmt, vargs);
+}
+
+FMT_EXPORT
+template <typename... Args>
+void print(std::wostream& os,
+ basic_format_string<wchar_t, type_identity_t<Args>...> fmt,
+ Args&&... args) {
+ vprint(os, fmt, fmt::make_format_args<buffer_context<wchar_t>>(args...));
+}
+
+FMT_EXPORT template <typename... T>
+void println(std::ostream& os, format_string<T...> fmt, T&&... args) {
+ fmt::print(os, "{}\n", fmt::format(fmt, std::forward<T>(args)...));
+}
+
+FMT_EXPORT
+template <typename... Args>
+void println(std::wostream& os,
+ basic_format_string<wchar_t, type_identity_t<Args>...> fmt,
+ Args&&... args) {
+ print(os, L"{}\n", fmt::format(fmt, std::forward<Args>(args)...));
+}
+
+FMT_END_NAMESPACE
+
+#endif // FMT_OSTREAM_H_
--- /dev/null
+// Formatting library for C++ - formatters for standard library types
+//
+// Copyright (c) 2012 - present, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#ifndef FMT_STD_H_
+#define FMT_STD_H_
+
+#include <atomic>
+#include <bitset>
+#include <cstdlib>
+#include <exception>
+#include <memory>
+#include <thread>
+#include <type_traits>
+#include <typeinfo>
+#include <utility>
+#include <vector>
+
+#include "format.h"
+#include "ostream.h"
+
+#if FMT_HAS_INCLUDE(<version>)
+# include <version>
+#endif
+// Checking FMT_CPLUSPLUS for warning suppression in MSVC.
+#if FMT_CPLUSPLUS >= 201703L
+# if FMT_HAS_INCLUDE(<filesystem>)
+# include <filesystem>
+# endif
+# if FMT_HAS_INCLUDE(<variant>)
+# include <variant>
+# endif
+# if FMT_HAS_INCLUDE(<optional>)
+# include <optional>
+# endif
+#endif
+
+#if FMT_CPLUSPLUS > 201703L && FMT_HAS_INCLUDE(<source_location>)
+# include <source_location>
+#endif
+
+// GCC 4 does not support FMT_HAS_INCLUDE.
+#if FMT_HAS_INCLUDE(<cxxabi.h>) || defined(__GLIBCXX__)
+# include <cxxabi.h>
+// Android NDK with gabi++ library on some architectures does not implement
+// abi::__cxa_demangle().
+# ifndef __GABIXX_CXXABI_H__
+# define FMT_HAS_ABI_CXA_DEMANGLE
+# endif
+#endif
+
+// Check if typeid is available.
+#ifndef FMT_USE_TYPEID
+// __RTTI is for EDG compilers. In MSVC typeid is available without RTTI.
+# if defined(__GXX_RTTI) || FMT_HAS_FEATURE(cxx_rtti) || FMT_MSC_VERSION || \
+ defined(__INTEL_RTTI__) || defined(__RTTI)
+# define FMT_USE_TYPEID 1
+# else
+# define FMT_USE_TYPEID 0
+# endif
+#endif
+
+// For older Xcode versions, __cpp_lib_xxx flags are inaccurately defined.
+#ifndef FMT_CPP_LIB_FILESYSTEM
+# ifdef __cpp_lib_filesystem
+# define FMT_CPP_LIB_FILESYSTEM __cpp_lib_filesystem
+# else
+# define FMT_CPP_LIB_FILESYSTEM 0
+# endif
+#endif
+
+#ifndef FMT_CPP_LIB_VARIANT
+# ifdef __cpp_lib_variant
+# define FMT_CPP_LIB_VARIANT __cpp_lib_variant
+# else
+# define FMT_CPP_LIB_VARIANT 0
+# endif
+#endif
+
+#if FMT_CPP_LIB_FILESYSTEM
+FMT_BEGIN_NAMESPACE
+
+namespace detail {
+
+template <typename Char, typename PathChar>
+auto get_path_string(const std::filesystem::path& p,
+ const std::basic_string<PathChar>& native) {
+ if constexpr (std::is_same_v<Char, char> && std::is_same_v<PathChar, wchar_t>)
+ return to_utf8<wchar_t>(native, to_utf8_error_policy::replace);
+ else
+ return p.string<Char>();
+}
+
+template <typename Char, typename PathChar>
+void write_escaped_path(basic_memory_buffer<Char>& quoted,
+ const std::filesystem::path& p,
+ const std::basic_string<PathChar>& native) {
+ if constexpr (std::is_same_v<Char, char> &&
+ std::is_same_v<PathChar, wchar_t>) {
+ auto buf = basic_memory_buffer<wchar_t>();
+ write_escaped_string<wchar_t>(std::back_inserter(buf), native);
+ bool valid = to_utf8<wchar_t>::convert(quoted, {buf.data(), buf.size()});
+ FMT_ASSERT(valid, "invalid utf16");
+ } else if constexpr (std::is_same_v<Char, PathChar>) {
+ write_escaped_string<std::filesystem::path::value_type>(
+ std::back_inserter(quoted), native);
+ } else {
+ write_escaped_string<Char>(std::back_inserter(quoted), p.string<Char>());
+ }
+}
+
+} // namespace detail
+
+FMT_EXPORT
+template <typename Char> struct formatter<std::filesystem::path, Char> {
+ private:
+ format_specs<Char> specs_;
+ detail::arg_ref<Char> width_ref_;
+ bool debug_ = false;
+ char path_type_ = 0;
+
+ public:
+ FMT_CONSTEXPR void set_debug_format(bool set = true) { debug_ = set; }
+
+ template <typename ParseContext> FMT_CONSTEXPR auto parse(ParseContext& ctx) {
+ auto it = ctx.begin(), end = ctx.end();
+ if (it == end) return it;
+
+ it = detail::parse_align(it, end, specs_);
+ if (it == end) return it;
+
+ it = detail::parse_dynamic_spec(it, end, specs_.width, width_ref_, ctx);
+ if (it != end && *it == '?') {
+ debug_ = true;
+ ++it;
+ }
+ if (it != end && (*it == 'g')) path_type_ = *it++;
+ return it;
+ }
+
+ template <typename FormatContext>
+ auto format(const std::filesystem::path& p, FormatContext& ctx) const {
+ auto specs = specs_;
+# ifdef _WIN32
+ auto path_string = !path_type_ ? p.native() : p.generic_wstring();
+# else
+ auto path_string = !path_type_ ? p.native() : p.generic_string();
+# endif
+
+ detail::handle_dynamic_spec<detail::width_checker>(specs.width, width_ref_,
+ ctx);
+ if (!debug_) {
+ auto s = detail::get_path_string<Char>(p, path_string);
+ return detail::write(ctx.out(), basic_string_view<Char>(s), specs);
+ }
+ auto quoted = basic_memory_buffer<Char>();
+ detail::write_escaped_path(quoted, p, path_string);
+ return detail::write(ctx.out(),
+ basic_string_view<Char>(quoted.data(), quoted.size()),
+ specs);
+ }
+};
+FMT_END_NAMESPACE
+#endif // FMT_CPP_LIB_FILESYSTEM
+
+FMT_BEGIN_NAMESPACE
+FMT_EXPORT
+template <std::size_t N, typename Char>
+struct formatter<std::bitset<N>, Char> : nested_formatter<string_view> {
+ private:
+ // Functor because C++11 doesn't support generic lambdas.
+ struct writer {
+ const std::bitset<N>& bs;
+
+ template <typename OutputIt>
+ FMT_CONSTEXPR auto operator()(OutputIt out) -> OutputIt {
+ for (auto pos = N; pos > 0; --pos) {
+ out = detail::write<Char>(out, bs[pos - 1] ? Char('1') : Char('0'));
+ }
+
+ return out;
+ }
+ };
+
+ public:
+ template <typename FormatContext>
+ auto format(const std::bitset<N>& bs, FormatContext& ctx) const
+ -> decltype(ctx.out()) {
+ return write_padded(ctx, writer{bs});
+ }
+};
+
+FMT_EXPORT
+template <typename Char>
+struct formatter<std::thread::id, Char> : basic_ostream_formatter<Char> {};
+FMT_END_NAMESPACE
+
+#ifdef __cpp_lib_optional
+FMT_BEGIN_NAMESPACE
+FMT_EXPORT
+template <typename T, typename Char>
+struct formatter<std::optional<T>, Char,
+ std::enable_if_t<is_formattable<T, Char>::value>> {
+ private:
+ formatter<T, Char> underlying_;
+ static constexpr basic_string_view<Char> optional =
+ detail::string_literal<Char, 'o', 'p', 't', 'i', 'o', 'n', 'a', 'l',
+ '('>{};
+ static constexpr basic_string_view<Char> none =
+ detail::string_literal<Char, 'n', 'o', 'n', 'e'>{};
+
+ template <class U>
+ FMT_CONSTEXPR static auto maybe_set_debug_format(U& u, bool set)
+ -> decltype(u.set_debug_format(set)) {
+ u.set_debug_format(set);
+ }
+
+ template <class U>
+ FMT_CONSTEXPR static void maybe_set_debug_format(U&, ...) {}
+
+ public:
+ template <typename ParseContext> FMT_CONSTEXPR auto parse(ParseContext& ctx) {
+ maybe_set_debug_format(underlying_, true);
+ return underlying_.parse(ctx);
+ }
+
+ template <typename FormatContext>
+ auto format(const std::optional<T>& opt, FormatContext& ctx) const
+ -> decltype(ctx.out()) {
+ if (!opt) return detail::write<Char>(ctx.out(), none);
+
+ auto out = ctx.out();
+ out = detail::write<Char>(out, optional);
+ ctx.advance_to(out);
+ out = underlying_.format(*opt, ctx);
+ return detail::write(out, ')');
+ }
+};
+FMT_END_NAMESPACE
+#endif // __cpp_lib_optional
+
+#ifdef __cpp_lib_source_location
+FMT_BEGIN_NAMESPACE
+FMT_EXPORT
+template <> struct formatter<std::source_location> {
+ template <typename ParseContext> FMT_CONSTEXPR auto parse(ParseContext& ctx) {
+ return ctx.begin();
+ }
+
+ template <typename FormatContext>
+ auto format(const std::source_location& loc, FormatContext& ctx) const
+ -> decltype(ctx.out()) {
+ auto out = ctx.out();
+ out = detail::write(out, loc.file_name());
+ out = detail::write(out, ':');
+ out = detail::write<char>(out, loc.line());
+ out = detail::write(out, ':');
+ out = detail::write<char>(out, loc.column());
+ out = detail::write(out, ": ");
+ out = detail::write(out, loc.function_name());
+ return out;
+ }
+};
+FMT_END_NAMESPACE
+#endif
+
+#if FMT_CPP_LIB_VARIANT
+FMT_BEGIN_NAMESPACE
+namespace detail {
+
+template <typename T>
+using variant_index_sequence =
+ std::make_index_sequence<std::variant_size<T>::value>;
+
+template <typename> struct is_variant_like_ : std::false_type {};
+template <typename... Types>
+struct is_variant_like_<std::variant<Types...>> : std::true_type {};
+
+// formattable element check.
+template <typename T, typename C> class is_variant_formattable_ {
+ template <std::size_t... Is>
+ static std::conjunction<
+ is_formattable<std::variant_alternative_t<Is, T>, C>...>
+ check(std::index_sequence<Is...>);
+
+ public:
+ static constexpr const bool value =
+ decltype(check(variant_index_sequence<T>{}))::value;
+};
+
+template <typename Char, typename OutputIt, typename T>
+auto write_variant_alternative(OutputIt out, const T& v) -> OutputIt {
+ if constexpr (is_string<T>::value)
+ return write_escaped_string<Char>(out, detail::to_string_view(v));
+ else if constexpr (std::is_same_v<T, Char>)
+ return write_escaped_char(out, v);
+ else
+ return write<Char>(out, v);
+}
+
+} // namespace detail
+
+template <typename T> struct is_variant_like {
+ static constexpr const bool value = detail::is_variant_like_<T>::value;
+};
+
+template <typename T, typename C> struct is_variant_formattable {
+ static constexpr const bool value =
+ detail::is_variant_formattable_<T, C>::value;
+};
+
+FMT_EXPORT
+template <typename Char> struct formatter<std::monostate, Char> {
+ template <typename ParseContext>
+ FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
+ return ctx.begin();
+ }
+
+ template <typename FormatContext>
+ auto format(const std::monostate&, FormatContext& ctx) const
+ -> decltype(ctx.out()) {
+ return detail::write<Char>(ctx.out(), "monostate");
+ }
+};
+
+FMT_EXPORT
+template <typename Variant, typename Char>
+struct formatter<
+ Variant, Char,
+ std::enable_if_t<std::conjunction_v<
+ is_variant_like<Variant>, is_variant_formattable<Variant, Char>>>> {
+ template <typename ParseContext>
+ FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
+ return ctx.begin();
+ }
+
+ template <typename FormatContext>
+ auto format(const Variant& value, FormatContext& ctx) const
+ -> decltype(ctx.out()) {
+ auto out = ctx.out();
+
+ out = detail::write<Char>(out, "variant(");
+ FMT_TRY {
+ std::visit(
+ [&](const auto& v) {
+ out = detail::write_variant_alternative<Char>(out, v);
+ },
+ value);
+ }
+ FMT_CATCH(const std::bad_variant_access&) {
+ detail::write<Char>(out, "valueless by exception");
+ }
+ *out++ = ')';
+ return out;
+ }
+};
+FMT_END_NAMESPACE
+#endif // FMT_CPP_LIB_VARIANT
+
+FMT_BEGIN_NAMESPACE
+FMT_EXPORT
+template <typename Char> struct formatter<std::error_code, Char> {
+ template <typename ParseContext>
+ FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
+ return ctx.begin();
+ }
+
+ template <typename FormatContext>
+ FMT_CONSTEXPR auto format(const std::error_code& ec, FormatContext& ctx) const
+ -> decltype(ctx.out()) {
+ auto out = ctx.out();
+ out = detail::write_bytes(out, ec.category().name(), format_specs<Char>());
+ out = detail::write<Char>(out, Char(':'));
+ out = detail::write<Char>(out, ec.value());
+ return out;
+ }
+};
+
+FMT_EXPORT
+template <typename T, typename Char>
+struct formatter<
+ T, Char, // DEPRECATED! Mixing code unit types.
+ typename std::enable_if<std::is_base_of<std::exception, T>::value>::type> {
+ private:
+ bool with_typename_ = false;
+
+ public:
+ FMT_CONSTEXPR auto parse(basic_format_parse_context<Char>& ctx)
+ -> decltype(ctx.begin()) {
+ auto it = ctx.begin();
+ auto end = ctx.end();
+ if (it == end || *it == '}') return it;
+ if (*it == 't') {
+ ++it;
+ with_typename_ = FMT_USE_TYPEID != 0;
+ }
+ return it;
+ }
+
+ template <typename OutputIt>
+ auto format(const std::exception& ex,
+ basic_format_context<OutputIt, Char>& ctx) const -> OutputIt {
+ format_specs<Char> spec;
+ auto out = ctx.out();
+ if (!with_typename_)
+ return detail::write_bytes(out, string_view(ex.what()), spec);
+
+#if FMT_USE_TYPEID
+ const std::type_info& ti = typeid(ex);
+# ifdef FMT_HAS_ABI_CXA_DEMANGLE
+ int status = 0;
+ std::size_t size = 0;
+ std::unique_ptr<char, void (*)(void*)> demangled_name_ptr(
+ abi::__cxa_demangle(ti.name(), nullptr, &size, &status), &std::free);
+
+ string_view demangled_name_view;
+ if (demangled_name_ptr) {
+ demangled_name_view = demangled_name_ptr.get();
+
+ // Normalization of stdlib inline namespace names.
+ // libc++ inline namespaces.
+ // std::__1::* -> std::*
+ // std::__1::__fs::* -> std::*
+ // libstdc++ inline namespaces.
+ // std::__cxx11::* -> std::*
+ // std::filesystem::__cxx11::* -> std::filesystem::*
+ if (demangled_name_view.starts_with("std::")) {
+ char* begin = demangled_name_ptr.get();
+ char* to = begin + 5; // std::
+ for (char *from = to, *end = begin + demangled_name_view.size();
+ from < end;) {
+ // This is safe, because demangled_name is NUL-terminated.
+ if (from[0] == '_' && from[1] == '_') {
+ char* next = from + 1;
+ while (next < end && *next != ':') next++;
+ if (next[0] == ':' && next[1] == ':') {
+ from = next + 2;
+ continue;
+ }
+ }
+ *to++ = *from++;
+ }
+ demangled_name_view = {begin, detail::to_unsigned(to - begin)};
+ }
+ } else {
+ demangled_name_view = string_view(ti.name());
+ }
+ out = detail::write_bytes(out, demangled_name_view, spec);
+# elif FMT_MSC_VERSION
+ string_view demangled_name_view(ti.name());
+ if (demangled_name_view.starts_with("class "))
+ demangled_name_view.remove_prefix(6);
+ else if (demangled_name_view.starts_with("struct "))
+ demangled_name_view.remove_prefix(7);
+ out = detail::write_bytes(out, demangled_name_view, spec);
+# else
+ out = detail::write_bytes(out, string_view(ti.name()), spec);
+# endif
+ *out++ = ':';
+ *out++ = ' ';
+ return detail::write_bytes(out, string_view(ex.what()), spec);
+#endif
+ }
+};
+
+namespace detail {
+
+template <typename T, typename Enable = void>
+struct has_flip : std::false_type {};
+
+template <typename T>
+struct has_flip<T, void_t<decltype(std::declval<T>().flip())>>
+ : std::true_type {};
+
+template <typename T> struct is_bit_reference_like {
+ static constexpr const bool value =
+ std::is_convertible<T, bool>::value &&
+ std::is_nothrow_assignable<T, bool>::value && has_flip<T>::value;
+};
+
+#ifdef _LIBCPP_VERSION
+
+// Workaround for libc++ incompatibility with C++ standard.
+// According to the Standard, `bitset::operator[] const` returns bool.
+template <typename C>
+struct is_bit_reference_like<std::__bit_const_reference<C>> {
+ static constexpr const bool value = true;
+};
+
+#endif
+
+} // namespace detail
+
+// We can't use std::vector<bool, Allocator>::reference and
+// std::bitset<N>::reference because the compiler can't deduce Allocator and N
+// in partial specialization.
+FMT_EXPORT
+template <typename BitRef, typename Char>
+struct formatter<BitRef, Char,
+ enable_if_t<detail::is_bit_reference_like<BitRef>::value>>
+ : formatter<bool, Char> {
+ template <typename FormatContext>
+ FMT_CONSTEXPR auto format(const BitRef& v, FormatContext& ctx) const
+ -> decltype(ctx.out()) {
+ return formatter<bool, Char>::format(v, ctx);
+ }
+};
+
+FMT_EXPORT
+template <typename T, typename Char>
+struct formatter<std::atomic<T>, Char,
+ enable_if_t<is_formattable<T, Char>::value>>
+ : formatter<T, Char> {
+ template <typename FormatContext>
+ auto format(const std::atomic<T>& v, FormatContext& ctx) const
+ -> decltype(ctx.out()) {
+ return formatter<T, Char>::format(v.load(), ctx);
+ }
+};
+
+#ifdef __cpp_lib_atomic_flag_test
+FMT_EXPORT
+template <typename Char>
+struct formatter<std::atomic_flag, Char> : formatter<bool, Char> {
+ template <typename FormatContext>
+ auto format(const std::atomic_flag& v, FormatContext& ctx) const
+ -> decltype(ctx.out()) {
+ return formatter<bool, Char>::format(v.test(), ctx);
+ }
+};
+#endif // __cpp_lib_atomic_flag_test
+
+FMT_END_NAMESPACE
+#endif // FMT_STD_H_
projects / thirdparty / ccache.git / commitdiff
