// Allocator traits -*- C++ -*-
-// Copyright (C) 2011-2020 Free Software Foundation, Inc.
+// Copyright (C) 2011-2024 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
#include <bits/stl_construct.h>
#include <bits/memoryfwd.h>
#if __cplusplus >= 201103L
-# include <bits/allocator.h>
# include <bits/ptr_traits.h>
# include <ext/numeric_traits.h>
+# if _GLIBCXX_HOSTED
+# include <bits/allocator.h>
+# endif
#endif
namespace std _GLIBCXX_VISIBILITY(default)
_GLIBCXX_BEGIN_NAMESPACE_VERSION
#if __cplusplus >= 201103L
-#define __cpp_lib_allocator_traits_is_always_equal 201411
-
+ /// @cond undocumented
struct __allocator_traits_base
{
template<typename _Tp, typename _Up, typename = void>
- struct __rebind : __replace_first_arg<_Tp, _Up> { };
+ struct __rebind : __replace_first_arg<_Tp, _Up>
+ {
+ static_assert(is_same<
+ typename __replace_first_arg<_Tp, typename _Tp::value_type>::type,
+ _Tp>::value,
+ "allocator_traits<A>::rebind_alloc<A::value_type> must be A");
+ };
template<typename _Tp, typename _Up>
struct __rebind<_Tp, _Up,
__void_t<typename _Tp::template rebind<_Up>::other>>
- { using type = typename _Tp::template rebind<_Up>::other; };
+ {
+ using type = typename _Tp::template rebind<_Up>::other;
+
+ static_assert(is_same<
+ typename _Tp::template rebind<typename _Tp::value_type>::other,
+ _Tp>::value,
+ "allocator_traits<A>::rebind_alloc<A::value_type> must be A");
+ };
protected:
template<typename _Tp>
template<typename _Tp>
using __pocs = typename _Tp::propagate_on_container_swap;
template<typename _Tp>
- using __equal = typename _Tp::is_always_equal;
+ using __equal = __type_identity<typename _Tp::is_always_equal>;
};
template<typename _Alloc, typename _Up>
using __alloc_rebind
= typename __allocator_traits_base::template __rebind<_Alloc, _Up>::type;
+ /// @endcond
/**
* @brief Uniform interface to all allocator types.
+ * @headerfile memory
* @ingroup allocators
+ * @since C++11
*/
template<typename _Alloc>
struct allocator_traits : __allocator_traits_base
* otherwise @c is_empty<Alloc>::type
*/
using is_always_equal
- = __detected_or_t<typename is_empty<_Alloc>::type, __equal, _Alloc>;
+ = typename __detected_or_t<is_empty<_Alloc>, __equal, _Alloc>::type;
template<typename _Tp>
using rebind_alloc = __alloc_rebind<_Alloc, _Tp>;
{ __a.deallocate(__p, __n); }
/**
- * @brief Construct an object of type @a _Tp
+ * @brief Construct an object of type `_Tp`
* @param __a An allocator.
* @param __p Pointer to memory of suitable size and alignment for Tp
* @param __args Constructor arguments.
{ return _S_select(__rhs, 0); }
};
-#if __cplusplus > 201703L
-# define __cpp_lib_constexpr_dynamic_alloc 201907L
-#endif
-
+#if _GLIBCXX_HOSTED
/// Partial specialization for std::allocator.
template<typename _Tp>
struct allocator_traits<allocator<_Tp>>
*
* Calls @c a.allocate(n)
*/
- _GLIBCXX_NODISCARD static _GLIBCXX20_CONSTEXPR pointer
+ [[__nodiscard__,__gnu__::__always_inline__]]
+ static _GLIBCXX20_CONSTEXPR pointer
allocate(allocator_type& __a, size_type __n)
{ return __a.allocate(__n); }
*
* Returns <tt> a.allocate(n, hint) </tt>
*/
- _GLIBCXX_NODISCARD static _GLIBCXX20_CONSTEXPR pointer
- allocate(allocator_type& __a, size_type __n, const_void_pointer __hint)
+ [[__nodiscard__,__gnu__::__always_inline__]]
+ static _GLIBCXX20_CONSTEXPR pointer
+ allocate(allocator_type& __a, size_type __n,
+ [[maybe_unused]] const_void_pointer __hint)
{
#if __cplusplus <= 201703L
return __a.allocate(__n, __hint);
*
* Calls <tt> a.deallocate(p, n) </tt>
*/
+ [[__gnu__::__always_inline__]]
static _GLIBCXX20_CONSTEXPR void
deallocate(allocator_type& __a, pointer __p, size_type __n)
{ __a.deallocate(__p, __n); }
* `std::construct_at(__p, std::forward<_Args>(__args)...)` instead.
*/
template<typename _Up, typename... _Args>
+ [[__gnu__::__always_inline__]]
static _GLIBCXX20_CONSTEXPR void
construct(allocator_type& __a __attribute__((__unused__)), _Up* __p,
_Args&&... __args)
* Calls @c __a.destroy(__p).
*/
template<typename _Up>
+ [[__gnu__::__always_inline__]]
static _GLIBCXX20_CONSTEXPR void
destroy(allocator_type& __a __attribute__((__unused__)), _Up* __p)
noexcept(is_nothrow_destructible<_Up>::value)
* @param __a An allocator.
* @return @c __a.max_size()
*/
+ [[__gnu__::__always_inline__]]
static _GLIBCXX20_CONSTEXPR size_type
max_size(const allocator_type& __a __attribute__((__unused__))) noexcept
{
* @param __rhs An allocator.
* @return @c __rhs
*/
+ [[__gnu__::__always_inline__]]
static _GLIBCXX20_CONSTEXPR allocator_type
select_on_container_copy_construction(const allocator_type& __rhs)
{ return __rhs; }
};
+ /// Explicit specialization for std::allocator<void>.
+ template<>
+ struct allocator_traits<allocator<void>>
+ {
+ /// The allocator type
+ using allocator_type = allocator<void>;
+
+ /// The allocated type
+ using value_type = void;
+
+ /// The allocator's pointer type.
+ using pointer = void*;
+
+ /// The allocator's const pointer type.
+ using const_pointer = const void*;
+
+ /// The allocator's void pointer type.
+ using void_pointer = void*;
+
+ /// The allocator's const void pointer type.
+ using const_void_pointer = const void*;
+
+ /// The allocator's difference type
+ using difference_type = std::ptrdiff_t;
+
+ /// The allocator's size type
+ using size_type = std::size_t;
+
+ /// How the allocator is propagated on copy assignment
+ using propagate_on_container_copy_assignment = false_type;
+
+ /// How the allocator is propagated on move assignment
+ using propagate_on_container_move_assignment = true_type;
+
+ /// How the allocator is propagated on swap
+ using propagate_on_container_swap = false_type;
+
+ /// Whether all instances of the allocator type compare equal.
+ using is_always_equal = true_type;
+
+ template<typename _Up>
+ using rebind_alloc = allocator<_Up>;
+
+ template<typename _Up>
+ using rebind_traits = allocator_traits<allocator<_Up>>;
+
+ /// allocate is ill-formed for allocator<void>
+ static void*
+ allocate(allocator_type&, size_type, const void* = nullptr) = delete;
+
+ /// deallocate is ill-formed for allocator<void>
+ static void
+ deallocate(allocator_type&, void*, size_type) = delete;
+
+ /**
+ * @brief Construct an object of type `_Up`
+ * @param __a An allocator.
+ * @param __p Pointer to memory of suitable size and alignment for
+ * an object of type `_Up`.
+ * @param __args Constructor arguments.
+ *
+ * Calls `__a.construct(__p, std::forward<_Args>(__args)...)`
+ * in C++11, C++14 and C++17. Changed in C++20 to call
+ * `std::construct_at(__p, std::forward<_Args>(__args)...)` instead.
+ */
+ template<typename _Up, typename... _Args>
+ [[__gnu__::__always_inline__]]
+ static _GLIBCXX20_CONSTEXPR void
+ construct(allocator_type&, _Up* __p, _Args&&... __args)
+ noexcept(std::is_nothrow_constructible<_Up, _Args...>::value)
+ { std::_Construct(__p, std::forward<_Args>(__args)...); }
+
+ /**
+ * @brief Destroy an object of type `_Up`
+ * @param __a An allocator.
+ * @param __p Pointer to the object to destroy
+ *
+ * Invokes the destructor for `*__p`.
+ */
+ template<typename _Up>
+ [[__gnu__::__always_inline__]]
+ static _GLIBCXX20_CONSTEXPR void
+ destroy(allocator_type&, _Up* __p)
+ noexcept(is_nothrow_destructible<_Up>::value)
+ { std::_Destroy(__p); }
+
+ /// max_size is ill-formed for allocator<void>
+ static size_type
+ max_size(const allocator_type&) = delete;
+
+ /**
+ * @brief Obtain an allocator to use when copying a container.
+ * @param __rhs An allocator.
+ * @return `__rhs`
+ */
+ [[__gnu__::__always_inline__]]
+ static _GLIBCXX20_CONSTEXPR allocator_type
+ select_on_container_copy_construction(const allocator_type& __rhs)
+ { return __rhs; }
+ };
+#endif
+
+ /// @cond undocumented
#if __cplusplus < 201703L
template<typename _Alloc>
+ [[__gnu__::__always_inline__]]
inline void
__do_alloc_on_copy(_Alloc& __one, const _Alloc& __two, true_type)
{ __one = __two; }
template<typename _Alloc>
+ [[__gnu__::__always_inline__]]
inline void
__do_alloc_on_copy(_Alloc&, const _Alloc&, false_type)
{ }
#endif
template<typename _Alloc>
+ [[__gnu__::__always_inline__]]
_GLIBCXX14_CONSTEXPR inline void
__alloc_on_copy(_Alloc& __one, const _Alloc& __two)
{
- typedef allocator_traits<_Alloc> __traits;
- typedef typename __traits::propagate_on_container_copy_assignment __pocca;
+ using __traits = allocator_traits<_Alloc>;
+ using __pocca =
+ typename __traits::propagate_on_container_copy_assignment::type;
#if __cplusplus >= 201703L
if constexpr (__pocca::value)
__one = __two;
}
template<typename _Alloc>
+ [[__gnu__::__always_inline__]]
constexpr _Alloc
__alloc_on_copy(const _Alloc& __a)
{
#if __cplusplus < 201703L
template<typename _Alloc>
+ [[__gnu__::__always_inline__]]
inline void __do_alloc_on_move(_Alloc& __one, _Alloc& __two, true_type)
{ __one = std::move(__two); }
template<typename _Alloc>
+ [[__gnu__::__always_inline__]]
inline void __do_alloc_on_move(_Alloc&, _Alloc&, false_type)
{ }
#endif
template<typename _Alloc>
+ [[__gnu__::__always_inline__]]
_GLIBCXX14_CONSTEXPR inline void
__alloc_on_move(_Alloc& __one, _Alloc& __two)
{
- typedef allocator_traits<_Alloc> __traits;
- typedef typename __traits::propagate_on_container_move_assignment __pocma;
+ using __traits = allocator_traits<_Alloc>;
+ using __pocma
+ = typename __traits::propagate_on_container_move_assignment::type;
#if __cplusplus >= 201703L
if constexpr (__pocma::value)
__one = std::move(__two);
#if __cplusplus < 201703L
template<typename _Alloc>
+ [[__gnu__::__always_inline__]]
inline void __do_alloc_on_swap(_Alloc& __one, _Alloc& __two, true_type)
{
using std::swap;
}
template<typename _Alloc>
+ [[__gnu__::__always_inline__]]
inline void __do_alloc_on_swap(_Alloc&, _Alloc&, false_type)
{ }
#endif
template<typename _Alloc>
+ [[__gnu__::__always_inline__]]
_GLIBCXX14_CONSTEXPR inline void
__alloc_on_swap(_Alloc& __one, _Alloc& __two)
{
- typedef allocator_traits<_Alloc> __traits;
- typedef typename __traits::propagate_on_container_swap __pocs;
+ using __traits = allocator_traits<_Alloc>;
+ using __pocs = typename __traits::propagate_on_container_swap::type;
#if __cplusplus >= 201703L
if constexpr (__pocs::value)
{
typename _Alloc::value_type const&>::type
{ };
+#if _GLIBCXX_HOSTED
// std::allocator<_Tp> just requires CopyConstructible
template<typename _Tp>
struct __is_copy_insertable<allocator<_Tp>>
: is_copy_constructible<_Tp>
{ };
+#endif
// true if _Alloc::value_type is MoveInsertable into containers using _Alloc
// (might be wrong if _Alloc::construct exists but is not constrained,
: __is_alloc_insertable_impl<_Alloc, typename _Alloc::value_type>::type
{ };
+#if _GLIBCXX_HOSTED
// std::allocator<_Tp> just requires MoveConstructible
template<typename _Tp>
struct __is_move_insertable<allocator<_Tp>>
: is_move_constructible<_Tp>
{ };
+#endif
// Trait to detect Allocator-like types.
template<typename _Alloc, typename = void>
template<typename _Alloc>
using _RequireNotAllocator
= typename enable_if<!__is_allocator<_Alloc>::value, _Alloc>::type;
+
+#if __cpp_concepts >= 201907L
+ template<typename _Alloc>
+ concept __allocator_like = requires (_Alloc& __a) {
+ typename _Alloc::value_type;
+ __a.deallocate(__a.allocate(1u), 1u);
+ };
+#endif
+ /// @endcond
#endif // C++11
+ /// @cond undocumented
+
+ // To implement Option 3 of DR 431.
+ template<typename _Alloc, bool = __is_empty(_Alloc)>
+ struct __alloc_swap
+ { static void _S_do_it(_Alloc&, _Alloc&) _GLIBCXX_NOEXCEPT { } };
+
+ template<typename _Alloc>
+ struct __alloc_swap<_Alloc, false>
+ {
+ static void
+ _S_do_it(_Alloc& __one, _Alloc& __two) _GLIBCXX_NOEXCEPT
+ {
+ // Precondition: swappable allocators.
+ if (__one != __two)
+ swap(__one, __two);
+ }
+ };
+
+#if __cplusplus >= 201103L
+ template<typename _Tp, bool
+ = __or_<is_copy_constructible<typename _Tp::value_type>,
+ is_nothrow_move_constructible<typename _Tp::value_type>>::value>
+ struct __shrink_to_fit_aux
+ { static bool _S_do_it(_Tp&) noexcept { return false; } };
+
+ template<typename _Tp>
+ struct __shrink_to_fit_aux<_Tp, true>
+ {
+ _GLIBCXX20_CONSTEXPR
+ static bool
+ _S_do_it(_Tp& __c) noexcept
+ {
+#if __cpp_exceptions
+ try
+ {
+ _Tp(__make_move_if_noexcept_iterator(__c.begin()),
+ __make_move_if_noexcept_iterator(__c.end()),
+ __c.get_allocator()).swap(__c);
+ return true;
+ }
+ catch(...)
+ { return false; }
+#else
+ return false;
+#endif
+ }
+ };
+#endif
+
/**
* Destroy a range of objects using the supplied allocator. For
* non-default allocators we do not optimize away invocation of
*/
template<typename _ForwardIterator, typename _Allocator>
+ _GLIBCXX20_CONSTEXPR
void
_Destroy(_ForwardIterator __first, _ForwardIterator __last,
_Allocator& __alloc)
#endif
}
+#if _GLIBCXX_HOSTED
template<typename _ForwardIterator, typename _Tp>
+ __attribute__((__always_inline__)) _GLIBCXX20_CONSTEXPR
inline void
_Destroy(_ForwardIterator __first, _ForwardIterator __last,
allocator<_Tp>&)
{
- _Destroy(__first, __last);
+ std::_Destroy(__first, __last);
}
+#endif
+ /// @endcond
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
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