// Functor implementations -*- C++ -*-
-// Copyright (C) 2001, 2002, 2004, 2005 Free Software Foundation, Inc.
+// Copyright (C) 2001-2024 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
// terms of the GNU General Public License as published by the
-// Free Software Foundation; either version 2, or (at your option)
+// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
-// You should have received a copy of the GNU General Public License along
-// with this library; see the file COPYING. If not, write to the Free
-// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
-// USA.
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
-// As a special exception, you may use this file as part of a free software
-// library without restriction. Specifically, if other files instantiate
-// templates or use macros or inline functions from this file, or you compile
-// this file and link it with other files to produce an executable, this
-// file does not by itself cause the resulting executable to be covered by
-// the GNU General Public License. This exception does not however
-// invalidate any other reasons why the executable file might be covered by
-// the GNU General Public License.
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// <http://www.gnu.org/licenses/>.
/*
*
* purpose. It is provided "as is" without express or implied warranty.
*/
-/** @file stl_function.h
+/** @file bits/stl_function.h
* This is an internal header file, included by other library headers.
- * You should not attempt to use it directly.
+ * Do not attempt to use it directly. @headername{functional}
*/
-#ifndef _FUNCTION_H
-#define _FUNCTION_H 1
+#ifndef _STL_FUNCTION_H
+#define _STL_FUNCTION_H 1
-namespace std
+#if __cplusplus > 201103L
+#include <bits/move.h>
+#endif
+
+namespace std _GLIBCXX_VISIBILITY(default)
{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
// 20.3.1 base classes
- /** @defgroup s20_3_1_base Functor Base Classes
- * Function objects, or @e functors, are objects with an @c operator()
+ /** @defgroup functors Function Objects
+ * @ingroup utilities
+ *
+ * Function objects, or _functors_, are objects with an `operator()`
* defined and accessible. They can be passed as arguments to algorithm
* templates and used in place of a function pointer. Not only is the
* resulting expressiveness of the library increased, but the generated
* code can be more efficient than what you might write by hand. When we
- * refer to "functors," then, generally we include function pointers in
+ * refer to _functors_, then, generally we include function pointers in
* the description as well.
*
* Often, functors are only created as temporaries passed to algorithm
* calls, rather than being created as named variables.
*
* Two examples taken from the standard itself follow. To perform a
- * by-element addition of two vectors @c a and @c b containing @c double,
- * and put the result in @c a, use
+ * by-element addition of two vectors `a` and `b` containing `double`,
+ * and put the result in `a`, use
* \code
* transform (a.begin(), a.end(), b.begin(), a.begin(), plus<double>());
* \endcode
- * To negate every element in @c a, use
+ * To negate every element in `a`, use
* \code
* transform(a.begin(), a.end(), a.begin(), negate<double>());
* \endcode
- * The addition and negation functions will be inlined directly.
+ * The addition and negation functions will usually be inlined directly.
*
- * The standard functors are derived from structs named @c unary_function
- * and @c binary_function. These two classes contain nothing but typedefs,
- * to aid in generic (template) programming. If you write your own
- * functors, you might consider doing the same.
+ * An _adaptable function object_ is one which provides nested typedefs
+ * `result_type` and either `argument_type` (for a unary function) or
+ * `first_argument_type` and `second_argument_type` (for a binary function).
+ * Those typedefs are used by function object adaptors such as `bind2nd`.
+ * The standard library provides two class templates, `unary_function` and
+ * `binary_function`, which define those typedefs and so can be used as
+ * base classes of adaptable function objects.
+ *
+ * Since C++11 the use of function object adaptors has been superseded by
+ * more powerful tools such as lambda expressions, `function<>`, and more
+ * powerful type deduction (using `auto` and `decltype`). The helpers for
+ * defining adaptable function objects are deprecated since C++11, and no
+ * longer part of the standard library since C++17. However, they are still
+ * defined and used by libstdc++ after C++17, as a conforming extension.
*
* @{
*/
+
/**
- * This is one of the @link s20_3_1_base functor base classes@endlink.
+ * Helper for defining adaptable unary function objects.
+ * @deprecated Deprecated in C++11, no longer in the standard since C++17.
*/
- template <class _Arg, class _Result>
+ template<typename _Arg, typename _Result>
struct unary_function
{
- typedef _Arg argument_type; ///< @c argument_type is the type of the
- /// argument (no surprises here)
+ /// @c argument_type is the type of the argument
+ typedef _Arg argument_type;
- typedef _Result result_type; ///< @c result_type is the return type
- };
+ /// @c result_type is the return type
+ typedef _Result result_type;
+ } _GLIBCXX11_DEPRECATED;
/**
- * This is one of the @link s20_3_1_base functor base classes@endlink.
+ * Helper for defining adaptable binary function objects.
+ * @deprecated Deprecated in C++11, no longer in the standard since C++17.
*/
- template <class _Arg1, class _Arg2, class _Result>
+ template<typename _Arg1, typename _Arg2, typename _Result>
struct binary_function
{
- typedef _Arg1 first_argument_type; ///< the type of the first argument
- /// (no surprises here)
+ /// @c first_argument_type is the type of the first argument
+ typedef _Arg1 first_argument_type;
- typedef _Arg2 second_argument_type; ///< the type of the second argument
- typedef _Result result_type; ///< type of the return type
- };
+ /// @c second_argument_type is the type of the second argument
+ typedef _Arg2 second_argument_type;
+
+ /// @c result_type is the return type
+ typedef _Result result_type;
+ } _GLIBCXX11_DEPRECATED;
/** @} */
// 20.3.2 arithmetic
- /** @defgroup s20_3_2_arithmetic Arithmetic Classes
- * Because basic math often needs to be done during an algorithm, the library
- * provides functors for those operations. See the documentation for
- * @link s20_3_1_base the base classes@endlink for examples of their use.
+
+ /** @defgroup arithmetic_functors Arithmetic Function Object Classes
+ * @ingroup functors
+ *
+ * The library provides function objects for basic arithmetic operations.
+ * See the documentation for @link functors function objects @endlink
+ * for examples of their use.
*
* @{
*/
- /// One of the @link s20_3_2_arithmetic math functors@endlink.
- template <class _Tp>
+
+#if __glibcxx_transparent_operators // C++ >= 14
+ struct __is_transparent; // undefined
+
+ template<typename _Tp = void>
+ struct plus;
+
+ template<typename _Tp = void>
+ struct minus;
+
+ template<typename _Tp = void>
+ struct multiplies;
+
+ template<typename _Tp = void>
+ struct divides;
+
+ template<typename _Tp = void>
+ struct modulus;
+
+ template<typename _Tp = void>
+ struct negate;
+#endif
+
+// Ignore warnings about unary_function and binary_function.
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+
+ /// One of the @link arithmetic_functors math functors@endlink.
+ template<typename _Tp>
struct plus : public binary_function<_Tp, _Tp, _Tp>
{
+ /// Returns the sum
+ _GLIBCXX14_CONSTEXPR
_Tp
operator()(const _Tp& __x, const _Tp& __y) const
{ return __x + __y; }
};
- /// One of the @link s20_3_2_arithmetic math functors@endlink.
- template <class _Tp>
+ /// One of the @link arithmetic_functors math functors@endlink.
+ template<typename _Tp>
struct minus : public binary_function<_Tp, _Tp, _Tp>
{
+ _GLIBCXX14_CONSTEXPR
_Tp
operator()(const _Tp& __x, const _Tp& __y) const
{ return __x - __y; }
};
- /// One of the @link s20_3_2_arithmetic math functors@endlink.
- template <class _Tp>
+ /// One of the @link arithmetic_functors math functors@endlink.
+ template<typename _Tp>
struct multiplies : public binary_function<_Tp, _Tp, _Tp>
{
+ _GLIBCXX14_CONSTEXPR
_Tp
operator()(const _Tp& __x, const _Tp& __y) const
{ return __x * __y; }
};
- /// One of the @link s20_3_2_arithmetic math functors@endlink.
- template <class _Tp>
+ /// One of the @link arithmetic_functors math functors@endlink.
+ template<typename _Tp>
struct divides : public binary_function<_Tp, _Tp, _Tp>
{
+ _GLIBCXX14_CONSTEXPR
_Tp
operator()(const _Tp& __x, const _Tp& __y) const
{ return __x / __y; }
};
- /// One of the @link s20_3_2_arithmetic math functors@endlink.
- template <class _Tp>
+ /// One of the @link arithmetic_functors math functors@endlink.
+ template<typename _Tp>
struct modulus : public binary_function<_Tp, _Tp, _Tp>
{
+ _GLIBCXX14_CONSTEXPR
_Tp
operator()(const _Tp& __x, const _Tp& __y) const
{ return __x % __y; }
};
- /// One of the @link s20_3_2_arithmetic math functors@endlink.
- template <class _Tp>
+ /// One of the @link arithmetic_functors math functors@endlink.
+ template<typename _Tp>
struct negate : public unary_function<_Tp, _Tp>
{
+ _GLIBCXX14_CONSTEXPR
_Tp
operator()(const _Tp& __x) const
{ return -__x; }
};
+#pragma GCC diagnostic pop
+
+#ifdef __glibcxx_transparent_operators // C++ >= 14
+ template<>
+ struct plus<void>
+ {
+ template <typename _Tp, typename _Up>
+ _GLIBCXX14_CONSTEXPR
+ auto
+ operator()(_Tp&& __t, _Up&& __u) const
+ noexcept(noexcept(std::forward<_Tp>(__t) + std::forward<_Up>(__u)))
+ -> decltype(std::forward<_Tp>(__t) + std::forward<_Up>(__u))
+ { return std::forward<_Tp>(__t) + std::forward<_Up>(__u); }
+
+ typedef __is_transparent is_transparent;
+ };
+
+ /// One of the @link arithmetic_functors math functors@endlink.
+ template<>
+ struct minus<void>
+ {
+ template <typename _Tp, typename _Up>
+ _GLIBCXX14_CONSTEXPR
+ auto
+ operator()(_Tp&& __t, _Up&& __u) const
+ noexcept(noexcept(std::forward<_Tp>(__t) - std::forward<_Up>(__u)))
+ -> decltype(std::forward<_Tp>(__t) - std::forward<_Up>(__u))
+ { return std::forward<_Tp>(__t) - std::forward<_Up>(__u); }
+
+ typedef __is_transparent is_transparent;
+ };
+
+ /// One of the @link arithmetic_functors math functors@endlink.
+ template<>
+ struct multiplies<void>
+ {
+ template <typename _Tp, typename _Up>
+ _GLIBCXX14_CONSTEXPR
+ auto
+ operator()(_Tp&& __t, _Up&& __u) const
+ noexcept(noexcept(std::forward<_Tp>(__t) * std::forward<_Up>(__u)))
+ -> decltype(std::forward<_Tp>(__t) * std::forward<_Up>(__u))
+ { return std::forward<_Tp>(__t) * std::forward<_Up>(__u); }
+
+ typedef __is_transparent is_transparent;
+ };
+
+ /// One of the @link arithmetic_functors math functors@endlink.
+ template<>
+ struct divides<void>
+ {
+ template <typename _Tp, typename _Up>
+ _GLIBCXX14_CONSTEXPR
+ auto
+ operator()(_Tp&& __t, _Up&& __u) const
+ noexcept(noexcept(std::forward<_Tp>(__t) / std::forward<_Up>(__u)))
+ -> decltype(std::forward<_Tp>(__t) / std::forward<_Up>(__u))
+ { return std::forward<_Tp>(__t) / std::forward<_Up>(__u); }
+
+ typedef __is_transparent is_transparent;
+ };
+
+ /// One of the @link arithmetic_functors math functors@endlink.
+ template<>
+ struct modulus<void>
+ {
+ template <typename _Tp, typename _Up>
+ _GLIBCXX14_CONSTEXPR
+ auto
+ operator()(_Tp&& __t, _Up&& __u) const
+ noexcept(noexcept(std::forward<_Tp>(__t) % std::forward<_Up>(__u)))
+ -> decltype(std::forward<_Tp>(__t) % std::forward<_Up>(__u))
+ { return std::forward<_Tp>(__t) % std::forward<_Up>(__u); }
+
+ typedef __is_transparent is_transparent;
+ };
+
+ /// One of the @link arithmetic_functors math functors@endlink.
+ template<>
+ struct negate<void>
+ {
+ template <typename _Tp>
+ _GLIBCXX14_CONSTEXPR
+ auto
+ operator()(_Tp&& __t) const
+ noexcept(noexcept(-std::forward<_Tp>(__t)))
+ -> decltype(-std::forward<_Tp>(__t))
+ { return -std::forward<_Tp>(__t); }
+
+ typedef __is_transparent is_transparent;
+ };
+#endif
/** @} */
// 20.3.3 comparisons
- /** @defgroup s20_3_3_comparisons Comparison Classes
+ /** @defgroup comparison_functors Comparison Classes
+ * @ingroup functors
+ *
* The library provides six wrapper functors for all the basic comparisons
* in C++, like @c <.
*
* @{
*/
- /// One of the @link s20_3_3_comparisons comparison functors@endlink.
- template <class _Tp>
+#if __glibcxx_transparent_operators // C++ >= 14
+ template<typename _Tp = void>
+ struct equal_to;
+
+ template<typename _Tp = void>
+ struct not_equal_to;
+
+ template<typename _Tp = void>
+ struct greater;
+
+ template<typename _Tp = void>
+ struct less;
+
+ template<typename _Tp = void>
+ struct greater_equal;
+
+ template<typename _Tp = void>
+ struct less_equal;
+#endif
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+
+ /// One of the @link comparison_functors comparison functors@endlink.
+ template<typename _Tp>
struct equal_to : public binary_function<_Tp, _Tp, bool>
{
+ _GLIBCXX14_CONSTEXPR
bool
operator()(const _Tp& __x, const _Tp& __y) const
{ return __x == __y; }
};
- /// One of the @link s20_3_3_comparisons comparison functors@endlink.
- template <class _Tp>
+ /// One of the @link comparison_functors comparison functors@endlink.
+ template<typename _Tp>
struct not_equal_to : public binary_function<_Tp, _Tp, bool>
{
+ _GLIBCXX14_CONSTEXPR
bool
operator()(const _Tp& __x, const _Tp& __y) const
{ return __x != __y; }
};
- /// One of the @link s20_3_3_comparisons comparison functors@endlink.
- template <class _Tp>
+ /// One of the @link comparison_functors comparison functors@endlink.
+ template<typename _Tp>
struct greater : public binary_function<_Tp, _Tp, bool>
{
+ _GLIBCXX14_CONSTEXPR
bool
operator()(const _Tp& __x, const _Tp& __y) const
{ return __x > __y; }
};
- /// One of the @link s20_3_3_comparisons comparison functors@endlink.
- template <class _Tp>
+ /// One of the @link comparison_functors comparison functors@endlink.
+ template<typename _Tp>
struct less : public binary_function<_Tp, _Tp, bool>
{
+ _GLIBCXX14_CONSTEXPR
bool
operator()(const _Tp& __x, const _Tp& __y) const
{ return __x < __y; }
};
- /// One of the @link s20_3_3_comparisons comparison functors@endlink.
- template <class _Tp>
+ /// One of the @link comparison_functors comparison functors@endlink.
+ template<typename _Tp>
struct greater_equal : public binary_function<_Tp, _Tp, bool>
{
+ _GLIBCXX14_CONSTEXPR
bool
operator()(const _Tp& __x, const _Tp& __y) const
{ return __x >= __y; }
};
- /// One of the @link s20_3_3_comparisons comparison functors@endlink.
- template <class _Tp>
+ /// One of the @link comparison_functors comparison functors@endlink.
+ template<typename _Tp>
struct less_equal : public binary_function<_Tp, _Tp, bool>
{
+ _GLIBCXX14_CONSTEXPR
bool
operator()(const _Tp& __x, const _Tp& __y) const
{ return __x <= __y; }
};
+
+ // Partial specialization of std::greater for pointers.
+ template<typename _Tp>
+ struct greater<_Tp*> : public binary_function<_Tp*, _Tp*, bool>
+ {
+ _GLIBCXX14_CONSTEXPR bool
+ operator()(_Tp* __x, _Tp* __y) const _GLIBCXX_NOTHROW
+ {
+#if __cplusplus >= 201402L
+ if (std::__is_constant_evaluated())
+ return __x > __y;
+#endif
+ return (__UINTPTR_TYPE__)__x > (__UINTPTR_TYPE__)__y;
+ }
+ };
+
+ // Partial specialization of std::less for pointers.
+ template<typename _Tp>
+ struct less<_Tp*> : public binary_function<_Tp*, _Tp*, bool>
+ {
+ _GLIBCXX14_CONSTEXPR bool
+ operator()(_Tp* __x, _Tp* __y) const _GLIBCXX_NOTHROW
+ {
+#if __cplusplus >= 201402L
+ if (std::__is_constant_evaluated())
+ return __x < __y;
+#endif
+ return (__UINTPTR_TYPE__)__x < (__UINTPTR_TYPE__)__y;
+ }
+ };
+
+ // Partial specialization of std::greater_equal for pointers.
+ template<typename _Tp>
+ struct greater_equal<_Tp*> : public binary_function<_Tp*, _Tp*, bool>
+ {
+ _GLIBCXX14_CONSTEXPR bool
+ operator()(_Tp* __x, _Tp* __y) const _GLIBCXX_NOTHROW
+ {
+#if __cplusplus >= 201402L
+ if (std::__is_constant_evaluated())
+ return __x >= __y;
+#endif
+ return (__UINTPTR_TYPE__)__x >= (__UINTPTR_TYPE__)__y;
+ }
+ };
+
+ // Partial specialization of std::less_equal for pointers.
+ template<typename _Tp>
+ struct less_equal<_Tp*> : public binary_function<_Tp*, _Tp*, bool>
+ {
+ _GLIBCXX14_CONSTEXPR bool
+ operator()(_Tp* __x, _Tp* __y) const _GLIBCXX_NOTHROW
+ {
+#if __cplusplus >= 201402L
+ if (std::__is_constant_evaluated())
+ return __x <= __y;
+#endif
+ return (__UINTPTR_TYPE__)__x <= (__UINTPTR_TYPE__)__y;
+ }
+ };
+#pragma GCC diagnostic pop
+
+#ifdef __glibcxx_transparent_operators // C++ >= 14
+ /// One of the @link comparison_functors comparison functors@endlink.
+ template<>
+ struct equal_to<void>
+ {
+ template <typename _Tp, typename _Up>
+ constexpr auto
+ operator()(_Tp&& __t, _Up&& __u) const
+ noexcept(noexcept(std::forward<_Tp>(__t) == std::forward<_Up>(__u)))
+ -> decltype(std::forward<_Tp>(__t) == std::forward<_Up>(__u))
+ { return std::forward<_Tp>(__t) == std::forward<_Up>(__u); }
+
+ typedef __is_transparent is_transparent;
+ };
+
+ /// One of the @link comparison_functors comparison functors@endlink.
+ template<>
+ struct not_equal_to<void>
+ {
+ template <typename _Tp, typename _Up>
+ constexpr auto
+ operator()(_Tp&& __t, _Up&& __u) const
+ noexcept(noexcept(std::forward<_Tp>(__t) != std::forward<_Up>(__u)))
+ -> decltype(std::forward<_Tp>(__t) != std::forward<_Up>(__u))
+ { return std::forward<_Tp>(__t) != std::forward<_Up>(__u); }
+
+ typedef __is_transparent is_transparent;
+ };
+
+ /// One of the @link comparison_functors comparison functors@endlink.
+ template<>
+ struct greater<void>
+ {
+ template <typename _Tp, typename _Up>
+ constexpr auto
+ operator()(_Tp&& __t, _Up&& __u) const
+ noexcept(noexcept(std::forward<_Tp>(__t) > std::forward<_Up>(__u)))
+ -> decltype(std::forward<_Tp>(__t) > std::forward<_Up>(__u))
+ {
+ return _S_cmp(std::forward<_Tp>(__t), std::forward<_Up>(__u),
+ __ptr_cmp<_Tp, _Up>{});
+ }
+
+ template<typename _Tp, typename _Up>
+ constexpr bool
+ operator()(_Tp* __t, _Up* __u) const noexcept
+ { return greater<common_type_t<_Tp*, _Up*>>{}(__t, __u); }
+
+ typedef __is_transparent is_transparent;
+
+ private:
+ template <typename _Tp, typename _Up>
+ static constexpr decltype(auto)
+ _S_cmp(_Tp&& __t, _Up&& __u, false_type)
+ { return std::forward<_Tp>(__t) > std::forward<_Up>(__u); }
+
+ template <typename _Tp, typename _Up>
+ static constexpr bool
+ _S_cmp(_Tp&& __t, _Up&& __u, true_type) noexcept
+ {
+ return greater<const volatile void*>{}(
+ static_cast<const volatile void*>(std::forward<_Tp>(__t)),
+ static_cast<const volatile void*>(std::forward<_Up>(__u)));
+ }
+
+ // True if there is no viable operator> member function.
+ template<typename _Tp, typename _Up, typename = void>
+ struct __not_overloaded2 : true_type { };
+
+ // False if we can call T.operator>(U)
+ template<typename _Tp, typename _Up>
+ struct __not_overloaded2<_Tp, _Up, __void_t<
+ decltype(std::declval<_Tp>().operator>(std::declval<_Up>()))>>
+ : false_type { };
+
+ // True if there is no overloaded operator> for these operands.
+ template<typename _Tp, typename _Up, typename = void>
+ struct __not_overloaded : __not_overloaded2<_Tp, _Up> { };
+
+ // False if we can call operator>(T,U)
+ template<typename _Tp, typename _Up>
+ struct __not_overloaded<_Tp, _Up, __void_t<
+ decltype(operator>(std::declval<_Tp>(), std::declval<_Up>()))>>
+ : false_type { };
+
+ template<typename _Tp, typename _Up>
+ using __ptr_cmp = __and_<__not_overloaded<_Tp, _Up>,
+ is_convertible<_Tp, const volatile void*>,
+ is_convertible<_Up, const volatile void*>>;
+ };
+
+ /// One of the @link comparison_functors comparison functors@endlink.
+ template<>
+ struct less<void>
+ {
+ template <typename _Tp, typename _Up>
+ constexpr auto
+ operator()(_Tp&& __t, _Up&& __u) const
+ noexcept(noexcept(std::forward<_Tp>(__t) < std::forward<_Up>(__u)))
+ -> decltype(std::forward<_Tp>(__t) < std::forward<_Up>(__u))
+ {
+ return _S_cmp(std::forward<_Tp>(__t), std::forward<_Up>(__u),
+ __ptr_cmp<_Tp, _Up>{});
+ }
+
+ template<typename _Tp, typename _Up>
+ constexpr bool
+ operator()(_Tp* __t, _Up* __u) const noexcept
+ { return less<common_type_t<_Tp*, _Up*>>{}(__t, __u); }
+
+ typedef __is_transparent is_transparent;
+
+ private:
+ template <typename _Tp, typename _Up>
+ static constexpr decltype(auto)
+ _S_cmp(_Tp&& __t, _Up&& __u, false_type)
+ { return std::forward<_Tp>(__t) < std::forward<_Up>(__u); }
+
+ template <typename _Tp, typename _Up>
+ static constexpr bool
+ _S_cmp(_Tp&& __t, _Up&& __u, true_type) noexcept
+ {
+ return less<const volatile void*>{}(
+ static_cast<const volatile void*>(std::forward<_Tp>(__t)),
+ static_cast<const volatile void*>(std::forward<_Up>(__u)));
+ }
+
+ // True if there is no viable operator< member function.
+ template<typename _Tp, typename _Up, typename = void>
+ struct __not_overloaded2 : true_type { };
+
+ // False if we can call T.operator<(U)
+ template<typename _Tp, typename _Up>
+ struct __not_overloaded2<_Tp, _Up, __void_t<
+ decltype(std::declval<_Tp>().operator<(std::declval<_Up>()))>>
+ : false_type { };
+
+ // True if there is no overloaded operator< for these operands.
+ template<typename _Tp, typename _Up, typename = void>
+ struct __not_overloaded : __not_overloaded2<_Tp, _Up> { };
+
+ // False if we can call operator<(T,U)
+ template<typename _Tp, typename _Up>
+ struct __not_overloaded<_Tp, _Up, __void_t<
+ decltype(operator<(std::declval<_Tp>(), std::declval<_Up>()))>>
+ : false_type { };
+
+ template<typename _Tp, typename _Up>
+ using __ptr_cmp = __and_<__not_overloaded<_Tp, _Up>,
+ is_convertible<_Tp, const volatile void*>,
+ is_convertible<_Up, const volatile void*>>;
+ };
+
+ /// One of the @link comparison_functors comparison functors@endlink.
+ template<>
+ struct greater_equal<void>
+ {
+ template <typename _Tp, typename _Up>
+ constexpr auto
+ operator()(_Tp&& __t, _Up&& __u) const
+ noexcept(noexcept(std::forward<_Tp>(__t) >= std::forward<_Up>(__u)))
+ -> decltype(std::forward<_Tp>(__t) >= std::forward<_Up>(__u))
+ {
+ return _S_cmp(std::forward<_Tp>(__t), std::forward<_Up>(__u),
+ __ptr_cmp<_Tp, _Up>{});
+ }
+
+ template<typename _Tp, typename _Up>
+ constexpr bool
+ operator()(_Tp* __t, _Up* __u) const noexcept
+ { return greater_equal<common_type_t<_Tp*, _Up*>>{}(__t, __u); }
+
+ typedef __is_transparent is_transparent;
+
+ private:
+ template <typename _Tp, typename _Up>
+ static constexpr decltype(auto)
+ _S_cmp(_Tp&& __t, _Up&& __u, false_type)
+ { return std::forward<_Tp>(__t) >= std::forward<_Up>(__u); }
+
+ template <typename _Tp, typename _Up>
+ static constexpr bool
+ _S_cmp(_Tp&& __t, _Up&& __u, true_type) noexcept
+ {
+ return greater_equal<const volatile void*>{}(
+ static_cast<const volatile void*>(std::forward<_Tp>(__t)),
+ static_cast<const volatile void*>(std::forward<_Up>(__u)));
+ }
+
+ // True if there is no viable operator>= member function.
+ template<typename _Tp, typename _Up, typename = void>
+ struct __not_overloaded2 : true_type { };
+
+ // False if we can call T.operator>=(U)
+ template<typename _Tp, typename _Up>
+ struct __not_overloaded2<_Tp, _Up, __void_t<
+ decltype(std::declval<_Tp>().operator>=(std::declval<_Up>()))>>
+ : false_type { };
+
+ // True if there is no overloaded operator>= for these operands.
+ template<typename _Tp, typename _Up, typename = void>
+ struct __not_overloaded : __not_overloaded2<_Tp, _Up> { };
+
+ // False if we can call operator>=(T,U)
+ template<typename _Tp, typename _Up>
+ struct __not_overloaded<_Tp, _Up, __void_t<
+ decltype(operator>=(std::declval<_Tp>(), std::declval<_Up>()))>>
+ : false_type { };
+
+ template<typename _Tp, typename _Up>
+ using __ptr_cmp = __and_<__not_overloaded<_Tp, _Up>,
+ is_convertible<_Tp, const volatile void*>,
+ is_convertible<_Up, const volatile void*>>;
+ };
+
+ /// One of the @link comparison_functors comparison functors@endlink.
+ template<>
+ struct less_equal<void>
+ {
+ template <typename _Tp, typename _Up>
+ constexpr auto
+ operator()(_Tp&& __t, _Up&& __u) const
+ noexcept(noexcept(std::forward<_Tp>(__t) <= std::forward<_Up>(__u)))
+ -> decltype(std::forward<_Tp>(__t) <= std::forward<_Up>(__u))
+ {
+ return _S_cmp(std::forward<_Tp>(__t), std::forward<_Up>(__u),
+ __ptr_cmp<_Tp, _Up>{});
+ }
+
+ template<typename _Tp, typename _Up>
+ constexpr bool
+ operator()(_Tp* __t, _Up* __u) const noexcept
+ { return less_equal<common_type_t<_Tp*, _Up*>>{}(__t, __u); }
+
+ typedef __is_transparent is_transparent;
+
+ private:
+ template <typename _Tp, typename _Up>
+ static constexpr decltype(auto)
+ _S_cmp(_Tp&& __t, _Up&& __u, false_type)
+ { return std::forward<_Tp>(__t) <= std::forward<_Up>(__u); }
+
+ template <typename _Tp, typename _Up>
+ static constexpr bool
+ _S_cmp(_Tp&& __t, _Up&& __u, true_type) noexcept
+ {
+ return less_equal<const volatile void*>{}(
+ static_cast<const volatile void*>(std::forward<_Tp>(__t)),
+ static_cast<const volatile void*>(std::forward<_Up>(__u)));
+ }
+
+ // True if there is no viable operator<= member function.
+ template<typename _Tp, typename _Up, typename = void>
+ struct __not_overloaded2 : true_type { };
+
+ // False if we can call T.operator<=(U)
+ template<typename _Tp, typename _Up>
+ struct __not_overloaded2<_Tp, _Up, __void_t<
+ decltype(std::declval<_Tp>().operator<=(std::declval<_Up>()))>>
+ : false_type { };
+
+ // True if there is no overloaded operator<= for these operands.
+ template<typename _Tp, typename _Up, typename = void>
+ struct __not_overloaded : __not_overloaded2<_Tp, _Up> { };
+
+ // False if we can call operator<=(T,U)
+ template<typename _Tp, typename _Up>
+ struct __not_overloaded<_Tp, _Up, __void_t<
+ decltype(operator<=(std::declval<_Tp>(), std::declval<_Up>()))>>
+ : false_type { };
+
+ template<typename _Tp, typename _Up>
+ using __ptr_cmp = __and_<__not_overloaded<_Tp, _Up>,
+ is_convertible<_Tp, const volatile void*>,
+ is_convertible<_Up, const volatile void*>>;
+ };
+#endif // __glibcxx_transparent_operators
/** @} */
// 20.3.4 logical operations
- /** @defgroup s20_3_4_logical Boolean Operations Classes
- * Here are wrapper functors for Boolean operations: @c &&, @c ||, and @c !.
+ /** @defgroup logical_functors Boolean Operations Classes
+ * @ingroup functors
+ *
+ * The library provides function objects for the logical operations:
+ * `&&`, `||`, and `!`.
*
* @{
*/
- /// One of the @link s20_3_4_logical Boolean operations functors@endlink.
- template <class _Tp>
+#ifdef __glibcxx_transparent_operators // C++ >= 14
+ template<typename _Tp = void>
+ struct logical_and;
+
+ template<typename _Tp = void>
+ struct logical_or;
+
+ template<typename _Tp = void>
+ struct logical_not;
+#endif
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+
+ /// One of the @link logical_functors Boolean operations functors@endlink.
+ template<typename _Tp>
struct logical_and : public binary_function<_Tp, _Tp, bool>
{
+ _GLIBCXX14_CONSTEXPR
bool
operator()(const _Tp& __x, const _Tp& __y) const
{ return __x && __y; }
};
- /// One of the @link s20_3_4_logical Boolean operations functors@endlink.
- template <class _Tp>
+ /// One of the @link logical_functors Boolean operations functors@endlink.
+ template<typename _Tp>
struct logical_or : public binary_function<_Tp, _Tp, bool>
{
+ _GLIBCXX14_CONSTEXPR
bool
operator()(const _Tp& __x, const _Tp& __y) const
{ return __x || __y; }
};
- /// One of the @link s20_3_4_logical Boolean operations functors@endlink.
- template <class _Tp>
+ /// One of the @link logical_functors Boolean operations functors@endlink.
+ template<typename _Tp>
struct logical_not : public unary_function<_Tp, bool>
{
+ _GLIBCXX14_CONSTEXPR
bool
operator()(const _Tp& __x) const
{ return !__x; }
};
+#pragma GCC diagnostic pop
+
+#ifdef __glibcxx_transparent_operators // C++ >= 14
+ /// One of the @link logical_functors Boolean operations functors@endlink.
+ template<>
+ struct logical_and<void>
+ {
+ template <typename _Tp, typename _Up>
+ _GLIBCXX14_CONSTEXPR
+ auto
+ operator()(_Tp&& __t, _Up&& __u) const
+ noexcept(noexcept(std::forward<_Tp>(__t) && std::forward<_Up>(__u)))
+ -> decltype(std::forward<_Tp>(__t) && std::forward<_Up>(__u))
+ { return std::forward<_Tp>(__t) && std::forward<_Up>(__u); }
+
+ typedef __is_transparent is_transparent;
+ };
+
+ /// One of the @link logical_functors Boolean operations functors@endlink.
+ template<>
+ struct logical_or<void>
+ {
+ template <typename _Tp, typename _Up>
+ _GLIBCXX14_CONSTEXPR
+ auto
+ operator()(_Tp&& __t, _Up&& __u) const
+ noexcept(noexcept(std::forward<_Tp>(__t) || std::forward<_Up>(__u)))
+ -> decltype(std::forward<_Tp>(__t) || std::forward<_Up>(__u))
+ { return std::forward<_Tp>(__t) || std::forward<_Up>(__u); }
+
+ typedef __is_transparent is_transparent;
+ };
+
+ /// One of the @link logical_functors Boolean operations functors@endlink.
+ template<>
+ struct logical_not<void>
+ {
+ template <typename _Tp>
+ _GLIBCXX14_CONSTEXPR
+ auto
+ operator()(_Tp&& __t) const
+ noexcept(noexcept(!std::forward<_Tp>(__t)))
+ -> decltype(!std::forward<_Tp>(__t))
+ { return !std::forward<_Tp>(__t); }
+
+ typedef __is_transparent is_transparent;
+ };
+#endif // __glibcxx_transparent_operators
/** @} */
+#ifdef __glibcxx_transparent_operators // C++ >= 14
+ template<typename _Tp = void>
+ struct bit_and;
+
+ template<typename _Tp = void>
+ struct bit_or;
+
+ template<typename _Tp = void>
+ struct bit_xor;
+
+ template<typename _Tp = void>
+ struct bit_not;
+#endif
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // DR 660. Missing Bitwise Operations.
+ template<typename _Tp>
+ struct bit_and : public binary_function<_Tp, _Tp, _Tp>
+ {
+ _GLIBCXX14_CONSTEXPR
+ _Tp
+ operator()(const _Tp& __x, const _Tp& __y) const
+ { return __x & __y; }
+ };
+
+ template<typename _Tp>
+ struct bit_or : public binary_function<_Tp, _Tp, _Tp>
+ {
+ _GLIBCXX14_CONSTEXPR
+ _Tp
+ operator()(const _Tp& __x, const _Tp& __y) const
+ { return __x | __y; }
+ };
+
+ template<typename _Tp>
+ struct bit_xor : public binary_function<_Tp, _Tp, _Tp>
+ {
+ _GLIBCXX14_CONSTEXPR
+ _Tp
+ operator()(const _Tp& __x, const _Tp& __y) const
+ { return __x ^ __y; }
+ };
+
+ template<typename _Tp>
+ struct bit_not : public unary_function<_Tp, _Tp>
+ {
+ _GLIBCXX14_CONSTEXPR
+ _Tp
+ operator()(const _Tp& __x) const
+ { return ~__x; }
+ };
+#pragma GCC diagnostic pop
+
+#ifdef __glibcxx_transparent_operators // C++ >= 14
+ template <>
+ struct bit_and<void>
+ {
+ template <typename _Tp, typename _Up>
+ _GLIBCXX14_CONSTEXPR
+ auto
+ operator()(_Tp&& __t, _Up&& __u) const
+ noexcept(noexcept(std::forward<_Tp>(__t) & std::forward<_Up>(__u)))
+ -> decltype(std::forward<_Tp>(__t) & std::forward<_Up>(__u))
+ { return std::forward<_Tp>(__t) & std::forward<_Up>(__u); }
+
+ typedef __is_transparent is_transparent;
+ };
+
+ template <>
+ struct bit_or<void>
+ {
+ template <typename _Tp, typename _Up>
+ _GLIBCXX14_CONSTEXPR
+ auto
+ operator()(_Tp&& __t, _Up&& __u) const
+ noexcept(noexcept(std::forward<_Tp>(__t) | std::forward<_Up>(__u)))
+ -> decltype(std::forward<_Tp>(__t) | std::forward<_Up>(__u))
+ { return std::forward<_Tp>(__t) | std::forward<_Up>(__u); }
+
+ typedef __is_transparent is_transparent;
+ };
+
+ template <>
+ struct bit_xor<void>
+ {
+ template <typename _Tp, typename _Up>
+ _GLIBCXX14_CONSTEXPR
+ auto
+ operator()(_Tp&& __t, _Up&& __u) const
+ noexcept(noexcept(std::forward<_Tp>(__t) ^ std::forward<_Up>(__u)))
+ -> decltype(std::forward<_Tp>(__t) ^ std::forward<_Up>(__u))
+ { return std::forward<_Tp>(__t) ^ std::forward<_Up>(__u); }
+
+ typedef __is_transparent is_transparent;
+ };
+
+ template <>
+ struct bit_not<void>
+ {
+ template <typename _Tp>
+ _GLIBCXX14_CONSTEXPR
+ auto
+ operator()(_Tp&& __t) const
+ noexcept(noexcept(~std::forward<_Tp>(__t)))
+ -> decltype(~std::forward<_Tp>(__t))
+ { return ~std::forward<_Tp>(__t); }
+
+ typedef __is_transparent is_transparent;
+ };
+#endif // C++14
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+
// 20.3.5 negators
- /** @defgroup s20_3_5_negators Negators
- * The functions @c not1 and @c not2 each take a predicate functor
- * and return an instance of @c unary_negate or
- * @c binary_negate, respectively. These classes are functors whose
- * @c operator() performs the stored predicate function and then returns
- * the negation of the result.
+ /** @defgroup negators Negators
+ * @ingroup functors
+ *
+ * The function templates `not1` and `not2` are function object adaptors,
+ * which each take a predicate functor and wrap it in an instance of
+ * `unary_negate` or `binary_negate`, respectively. Those classes are
+ * functors whose `operator()` evaluates the wrapped predicate function
+ * and then returns the negation of the result.
*
* For example, given a vector of integers and a trivial predicate,
* \code
* struct IntGreaterThanThree
* : public std::unary_function<int, bool>
* {
- * bool operator() (int x) { return x > 3; }
+ * bool operator() (int x) const { return x > 3; }
* };
*
* std::find_if (v.begin(), v.end(), not1(IntGreaterThanThree()));
* \endcode
- * The call to @c find_if will locate the first index (i) of @c v for which
- * "!(v[i] > 3)" is true.
+ * The call to `find_if` will locate the first index (i) of `v` for which
+ * `!(v[i] > 3)` is true.
*
* The not1/unary_negate combination works on predicates taking a single
- * argument. The not2/binary_negate combination works on predicates which
- * take two arguments.
+ * argument. The not2/binary_negate combination works on predicates taking
+ * two arguments.
+ *
+ * @deprecated Deprecated in C++17, no longer in the standard since C++20.
+ * Use `not_fn` instead.
*
* @{
*/
- /// One of the @link s20_3_5_negators negation functors@endlink.
- template <class _Predicate>
- class unary_negate
+ /// One of the @link negators negation functors@endlink.
+ template<typename _Predicate>
+ class _GLIBCXX17_DEPRECATED unary_negate
: public unary_function<typename _Predicate::argument_type, bool>
{
protected:
_Predicate _M_pred;
+
public:
+ _GLIBCXX14_CONSTEXPR
explicit
- unary_negate(const _Predicate& __x) : _M_pred(__x) {}
+ unary_negate(const _Predicate& __x) : _M_pred(__x) { }
+ _GLIBCXX14_CONSTEXPR
bool
operator()(const typename _Predicate::argument_type& __x) const
{ return !_M_pred(__x); }
};
- /// One of the @link s20_3_5_negators negation functors@endlink.
- template <class _Predicate>
+ /// One of the @link negators negation functors@endlink.
+ template<typename _Predicate>
+ _GLIBCXX17_DEPRECATED_SUGGEST("std::not_fn")
+ _GLIBCXX14_CONSTEXPR
inline unary_negate<_Predicate>
not1(const _Predicate& __pred)
{ return unary_negate<_Predicate>(__pred); }
- /// One of the @link s20_3_5_negators negation functors@endlink.
- template <class _Predicate>
- class binary_negate
+ /// One of the @link negators negation functors@endlink.
+ template<typename _Predicate>
+ class _GLIBCXX17_DEPRECATED binary_negate
: public binary_function<typename _Predicate::first_argument_type,
- typename _Predicate::second_argument_type,
- bool>
+ typename _Predicate::second_argument_type, bool>
{
protected:
_Predicate _M_pred;
+
public:
+ _GLIBCXX14_CONSTEXPR
explicit
- binary_negate(const _Predicate& __x)
- : _M_pred(__x) { }
+ binary_negate(const _Predicate& __x) : _M_pred(__x) { }
+ _GLIBCXX14_CONSTEXPR
bool
operator()(const typename _Predicate::first_argument_type& __x,
const typename _Predicate::second_argument_type& __y) const
{ return !_M_pred(__x, __y); }
};
- /// One of the @link s20_3_5_negators negation functors@endlink.
- template <class _Predicate>
+ /// One of the @link negators negation functors@endlink.
+ template<typename _Predicate>
+ _GLIBCXX17_DEPRECATED_SUGGEST("std::not_fn")
+ _GLIBCXX14_CONSTEXPR
inline binary_negate<_Predicate>
not2(const _Predicate& __pred)
{ return binary_negate<_Predicate>(__pred); }
/** @} */
- // 20.3.6 binders
- /** @defgroup s20_3_6_binder Binder Classes
- * Binders turn functions/functors with two arguments into functors with
- * a single argument, storing an argument to be applied later. For
- * example, a variable @c B of type @c binder1st is constructed from a
- * functor @c f and an argument @c x. Later, B's @c operator() is called
- * with a single argument @c y. The return value is the value of @c f(x,y).
- * @c B can be "called" with various arguments (y1, y2, ...) and will in
- * turn call @c f(x,y1), @c f(x,y2), ...
- *
- * The function @c bind1st is provided to save some typing. It takes the
- * function and an argument as parameters, and returns an instance of
- * @c binder1st.
- *
- * The type @c binder2nd and its creator function @c bind2nd do the same
- * thing, but the stored argument is passed as the second parameter instead
- * of the first, e.g., @c bind2nd(std::minus<float>,1.3) will create a
- * functor whose @c operator() accepts a floating-point number, subtracts
- * 1.3 from it, and returns the result. (If @c bind1st had been used,
- * the functor would perform "1.3 - x" instead.
- *
- * Creator-wrapper functions like @c bind1st are intended to be used in
- * calling algorithms. Their return values will be temporary objects.
- * (The goal is to not require you to type names like
- * @c std::binder1st<std::plus<int>> for declaring a variable to hold the
- * return value from @c bind1st(std::plus<int>,5).
- *
- * These become more useful when combined with the composition functions.
- *
- * @{
- */
- /// One of the @link s20_3_6_binder binder functors@endlink.
- template <class _Operation>
- class binder1st
- : public unary_function<typename _Operation::second_argument_type,
- typename _Operation::result_type>
- {
- protected:
- _Operation op;
- typename _Operation::first_argument_type value;
- public:
- binder1st(const _Operation& __x,
- const typename _Operation::first_argument_type& __y)
- : op(__x), value(__y) {}
-
- typename _Operation::result_type
- operator()(const typename _Operation::second_argument_type& __x) const
- { return op(value, __x); }
-
- // _GLIBCXX_RESOLVE_LIB_DEFECTS
- // 109. Missing binders for non-const sequence elements
- typename _Operation::result_type
- operator()(typename _Operation::second_argument_type& __x) const
- { return op(value, __x); }
- };
-
- /// One of the @link s20_3_6_binder binder functors@endlink.
- template <class _Operation, class _Tp>
- inline binder1st<_Operation>
- bind1st(const _Operation& __fn, const _Tp& __x)
- {
- typedef typename _Operation::first_argument_type _Arg1_type;
- return binder1st<_Operation>(__fn, _Arg1_type(__x));
- }
-
- /// One of the @link s20_3_6_binder binder functors@endlink.
- template <class _Operation>
- class binder2nd
- : public unary_function<typename _Operation::first_argument_type,
- typename _Operation::result_type>
- {
- protected:
- _Operation op;
- typename _Operation::second_argument_type value;
- public:
- binder2nd(const _Operation& __x,
- const typename _Operation::second_argument_type& __y)
- : op(__x), value(__y) {}
-
- typename _Operation::result_type
- operator()(const typename _Operation::first_argument_type& __x) const
- { return op(__x, value); }
-
- // _GLIBCXX_RESOLVE_LIB_DEFECTS
- // 109. Missing binders for non-const sequence elements
- typename _Operation::result_type
- operator()(typename _Operation::first_argument_type& __x) const
- { return op(__x, value); }
- };
-
- /// One of the @link s20_3_6_binder binder functors@endlink.
- template <class _Operation, class _Tp>
- inline binder2nd<_Operation>
- bind2nd(const _Operation& __fn, const _Tp& __x)
- {
- typedef typename _Operation::second_argument_type _Arg2_type;
- return binder2nd<_Operation>(__fn, _Arg2_type(__x));
- }
- /** @} */
-
// 20.3.7 adaptors pointers functions
- /** @defgroup s20_3_7_adaptors Adaptors for pointers to functions
+ /** @defgroup pointer_adaptors Adaptors for pointers to functions
+ * @ingroup functors
+ *
* The advantage of function objects over pointers to functions is that
* the objects in the standard library declare nested typedefs describing
- * their argument and result types with uniform names (e.g., @c result_type
- * from the base classes @c unary_function and @c binary_function).
+ * their argument and result types with uniform names (e.g., `result_type`
+ * from the base classes `unary_function` and `binary_function`).
* Sometimes those typedefs are required, not just optional.
*
* Adaptors are provided to turn pointers to unary (single-argument) and
* binary (double-argument) functions into function objects. The
- * long-winded functor @c pointer_to_unary_function is constructed with a
- * function pointer @c f, and its @c operator() called with argument @c x
- * returns @c f(x). The functor @c pointer_to_binary_function does the same
- * thing, but with a double-argument @c f and @c operator().
+ * long-winded functor `pointer_to_unary_function` is constructed with a
+ * function pointer `f`, and its `operator()` called with argument `x`
+ * returns `f(x)`. The functor `pointer_to_binary_function` does the same
+ * thing, but with a double-argument `f` and `operator()`.
*
- * The function @c ptr_fun takes a pointer-to-function @c f and constructs
+ * The function `ptr_fun` takes a pointer-to-function `f` and constructs
* an instance of the appropriate functor.
*
+ * @deprecated Deprecated in C++11, no longer in the standard since C++17.
+ *
* @{
*/
- /// One of the @link s20_3_7_adaptors adaptors for function pointers@endlink.
- template <class _Arg, class _Result>
+ /// One of the @link pointer_adaptors adaptors for function pointers@endlink.
+ template<typename _Arg, typename _Result>
class pointer_to_unary_function : public unary_function<_Arg, _Result>
{
protected:
_Result (*_M_ptr)(_Arg);
+
public:
- pointer_to_unary_function() {}
+ pointer_to_unary_function() { }
explicit
pointer_to_unary_function(_Result (*__x)(_Arg))
- : _M_ptr(__x) {}
+ : _M_ptr(__x) { }
_Result
operator()(_Arg __x) const
{ return _M_ptr(__x); }
- };
+ } _GLIBCXX11_DEPRECATED;
- /// One of the @link s20_3_7_adaptors adaptors for function pointers@endlink.
- template <class _Arg, class _Result>
+ /// One of the @link pointer_adaptors adaptors for function pointers@endlink.
+ template<typename _Arg, typename _Result>
+ _GLIBCXX11_DEPRECATED_SUGGEST("std::function")
inline pointer_to_unary_function<_Arg, _Result>
ptr_fun(_Result (*__x)(_Arg))
{ return pointer_to_unary_function<_Arg, _Result>(__x); }
- /// One of the @link s20_3_7_adaptors adaptors for function pointers@endlink.
- template <class _Arg1, class _Arg2, class _Result>
+ /// One of the @link pointer_adaptors adaptors for function pointers@endlink.
+ template<typename _Arg1, typename _Arg2, typename _Result>
class pointer_to_binary_function
: public binary_function<_Arg1, _Arg2, _Result>
{
protected:
_Result (*_M_ptr)(_Arg1, _Arg2);
+
public:
- pointer_to_binary_function() {}
+ pointer_to_binary_function() { }
explicit
pointer_to_binary_function(_Result (*__x)(_Arg1, _Arg2))
- : _M_ptr(__x) {}
+ : _M_ptr(__x) { }
_Result
operator()(_Arg1 __x, _Arg2 __y) const
{ return _M_ptr(__x, __y); }
- };
+ } _GLIBCXX11_DEPRECATED;
- /// One of the @link s20_3_7_adaptors adaptors for function pointers@endlink.
- template <class _Arg1, class _Arg2, class _Result>
+ /// One of the @link pointer_adaptors adaptors for function pointers@endlink.
+ template<typename _Arg1, typename _Arg2, typename _Result>
+ _GLIBCXX11_DEPRECATED_SUGGEST("std::function")
inline pointer_to_binary_function<_Arg1, _Arg2, _Result>
ptr_fun(_Result (*__x)(_Arg1, _Arg2))
{ return pointer_to_binary_function<_Arg1, _Arg2, _Result>(__x); }
/** @} */
- template <class _Tp>
- struct _Identity : public unary_function<_Tp,_Tp>
+ template<typename _Tp>
+ struct _Identity
+ : public unary_function<_Tp, _Tp>
{
_Tp&
operator()(_Tp& __x) const
{ return __x; }
};
- template <class _Pair>
- struct _Select1st : public unary_function<_Pair,
- typename _Pair::first_type>
+ // Partial specialization, avoids confusing errors in e.g. std::set<const T>.
+ template<typename _Tp> struct _Identity<const _Tp> : _Identity<_Tp> { };
+
+ template<typename _Pair>
+ struct _Select1st
+ : public unary_function<_Pair, typename _Pair::first_type>
{
typename _Pair::first_type&
operator()(_Pair& __x) const
const typename _Pair::first_type&
operator()(const _Pair& __x) const
{ return __x.first; }
+
+#if __cplusplus >= 201103L
+ template<typename _Pair2>
+ typename _Pair2::first_type&
+ operator()(_Pair2& __x) const
+ { return __x.first; }
+
+ template<typename _Pair2>
+ const typename _Pair2::first_type&
+ operator()(const _Pair2& __x) const
+ { return __x.first; }
+#endif
};
- template <class _Pair>
- struct _Select2nd : public unary_function<_Pair,
- typename _Pair::second_type>
+ template<typename _Pair>
+ struct _Select2nd
+ : public unary_function<_Pair, typename _Pair::second_type>
{
typename _Pair::second_type&
operator()(_Pair& __x) const
};
// 20.3.8 adaptors pointers members
- /** @defgroup s20_3_8_memadaptors Adaptors for pointers to members
- * There are a total of 16 = 2^4 function objects in this family.
+ /** @defgroup ptrmem_adaptors Adaptors for pointers to members
+ * @ingroup functors
+ *
+ * There are a total of 8 = 2^3 function objects in this family.
* (1) Member functions taking no arguments vs member functions taking
* one argument.
* (2) Call through pointer vs call through reference.
- * (3) Member function with void return type vs member function with
- * non-void return type.
- * (4) Const vs non-const member function.
- *
- * Note that choice (3) is nothing more than a workaround: according
- * to the draft, compilers should handle void and non-void the same way.
- * This feature is not yet widely implemented, though. You can only use
- * member functions returning void if your compiler supports partial
- * specialization.
+ * (3) Const vs non-const member function.
*
* All of this complexity is in the function objects themselves. You can
- * ignore it by using the helper function mem_fun and mem_fun_ref,
+ * ignore it by using the helper function `mem_fun` and `mem_fun_ref`,
* which create whichever type of adaptor is appropriate.
*
+ * @deprecated Deprecated in C++11, no longer in the standard since C++17.
+ * Use `mem_fn` instead.
+ *
* @{
*/
- /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
- template <class _Ret, class _Tp>
+ /// One of the @link ptrmem_adaptors adaptors for member pointers@endlink.
+ template<typename _Ret, typename _Tp>
class mem_fun_t : public unary_function<_Tp*, _Ret>
{
public:
explicit
mem_fun_t(_Ret (_Tp::*__pf)())
- : _M_f(__pf) {}
+ : _M_f(__pf) { }
_Ret
operator()(_Tp* __p) const
{ return (__p->*_M_f)(); }
+
private:
_Ret (_Tp::*_M_f)();
- };
+ } _GLIBCXX11_DEPRECATED;
- /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
- template <class _Ret, class _Tp>
+ /// One of the @link ptrmem_adaptors adaptors for member pointers@endlink.
+ template<typename _Ret, typename _Tp>
class const_mem_fun_t : public unary_function<const _Tp*, _Ret>
{
public:
explicit
const_mem_fun_t(_Ret (_Tp::*__pf)() const)
- : _M_f(__pf) {}
+ : _M_f(__pf) { }
_Ret
operator()(const _Tp* __p) const
{ return (__p->*_M_f)(); }
+
private:
_Ret (_Tp::*_M_f)() const;
- };
+ } _GLIBCXX11_DEPRECATED;
- /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
- template <class _Ret, class _Tp>
+ /// One of the @link ptrmem_adaptors adaptors for member pointers@endlink.
+ template<typename _Ret, typename _Tp>
class mem_fun_ref_t : public unary_function<_Tp, _Ret>
{
public:
explicit
mem_fun_ref_t(_Ret (_Tp::*__pf)())
- : _M_f(__pf) {}
+ : _M_f(__pf) { }
_Ret
operator()(_Tp& __r) const
{ return (__r.*_M_f)(); }
+
private:
_Ret (_Tp::*_M_f)();
- };
+ } _GLIBCXX11_DEPRECATED;
- /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
- template <class _Ret, class _Tp>
+ /// One of the @link ptrmem_adaptors adaptors for member pointers@endlink.
+ template<typename _Ret, typename _Tp>
class const_mem_fun_ref_t : public unary_function<_Tp, _Ret>
{
public:
explicit
const_mem_fun_ref_t(_Ret (_Tp::*__pf)() const)
- : _M_f(__pf) {}
+ : _M_f(__pf) { }
_Ret
operator()(const _Tp& __r) const
{ return (__r.*_M_f)(); }
+
private:
_Ret (_Tp::*_M_f)() const;
- };
+ } _GLIBCXX11_DEPRECATED;
- /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
- template <class _Ret, class _Tp, class _Arg>
+ /// One of the @link ptrmem_adaptors adaptors for member pointers@endlink.
+ template<typename _Ret, typename _Tp, typename _Arg>
class mem_fun1_t : public binary_function<_Tp*, _Arg, _Ret>
{
public:
explicit
mem_fun1_t(_Ret (_Tp::*__pf)(_Arg))
- : _M_f(__pf) {}
+ : _M_f(__pf) { }
_Ret
operator()(_Tp* __p, _Arg __x) const
{ return (__p->*_M_f)(__x); }
+
private:
_Ret (_Tp::*_M_f)(_Arg);
- };
+ } _GLIBCXX11_DEPRECATED;
- /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
- template <class _Ret, class _Tp, class _Arg>
+ /// One of the @link ptrmem_adaptors adaptors for member pointers@endlink.
+ template<typename _Ret, typename _Tp, typename _Arg>
class const_mem_fun1_t : public binary_function<const _Tp*, _Arg, _Ret>
{
public:
explicit
const_mem_fun1_t(_Ret (_Tp::*__pf)(_Arg) const)
- : _M_f(__pf) {}
+ : _M_f(__pf) { }
_Ret
operator()(const _Tp* __p, _Arg __x) const
{ return (__p->*_M_f)(__x); }
+
private:
_Ret (_Tp::*_M_f)(_Arg) const;
- };
+ } _GLIBCXX11_DEPRECATED;
- /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
- template <class _Ret, class _Tp, class _Arg>
+ /// One of the @link ptrmem_adaptors adaptors for member pointers@endlink.
+ template<typename _Ret, typename _Tp, typename _Arg>
class mem_fun1_ref_t : public binary_function<_Tp, _Arg, _Ret>
{
public:
explicit
mem_fun1_ref_t(_Ret (_Tp::*__pf)(_Arg))
- : _M_f(__pf) {}
+ : _M_f(__pf) { }
_Ret
operator()(_Tp& __r, _Arg __x) const
{ return (__r.*_M_f)(__x); }
+
private:
_Ret (_Tp::*_M_f)(_Arg);
- };
+ } _GLIBCXX11_DEPRECATED;
- /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
- template <class _Ret, class _Tp, class _Arg>
+ /// One of the @link ptrmem_adaptors adaptors for member pointers@endlink.
+ template<typename _Ret, typename _Tp, typename _Arg>
class const_mem_fun1_ref_t : public binary_function<_Tp, _Arg, _Ret>
{
public:
explicit
const_mem_fun1_ref_t(_Ret (_Tp::*__pf)(_Arg) const)
- : _M_f(__pf) {}
+ : _M_f(__pf) { }
_Ret
operator()(const _Tp& __r, _Arg __x) const
{ return (__r.*_M_f)(__x); }
- private:
- _Ret (_Tp::*_M_f)(_Arg) const;
- };
- /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
- template <class _Tp>
- class mem_fun_t<void, _Tp> : public unary_function<_Tp*, void>
- {
- public:
- explicit
- mem_fun_t(void (_Tp::*__pf)())
- : _M_f(__pf) {}
-
- void
- operator()(_Tp* __p) const
- { (__p->*_M_f)(); }
- private:
- void (_Tp::*_M_f)();
- };
-
- /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
- template <class _Tp>
- class const_mem_fun_t<void, _Tp> : public unary_function<const _Tp*, void>
- {
- public:
- explicit
- const_mem_fun_t(void (_Tp::*__pf)() const)
- : _M_f(__pf) {}
-
- void
- operator()(const _Tp* __p) const
- { (__p->*_M_f)(); }
- private:
- void (_Tp::*_M_f)() const;
- };
-
- /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
- template <class _Tp>
- class mem_fun_ref_t<void, _Tp> : public unary_function<_Tp, void>
- {
- public:
- explicit
- mem_fun_ref_t(void (_Tp::*__pf)())
- : _M_f(__pf) {}
-
- void
- operator()(_Tp& __r) const
- { (__r.*_M_f)(); }
- private:
- void (_Tp::*_M_f)();
- };
-
- /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
- template <class _Tp>
- class const_mem_fun_ref_t<void, _Tp> : public unary_function<_Tp, void>
- {
- public:
- explicit
- const_mem_fun_ref_t(void (_Tp::*__pf)() const)
- : _M_f(__pf) {}
-
- void
- operator()(const _Tp& __r) const
- { (__r.*_M_f)(); }
- private:
- void (_Tp::*_M_f)() const;
- };
-
- /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
- template <class _Tp, class _Arg>
- class mem_fun1_t<void, _Tp, _Arg> : public binary_function<_Tp*, _Arg, void>
- {
- public:
- explicit
- mem_fun1_t(void (_Tp::*__pf)(_Arg))
- : _M_f(__pf) {}
-
- void
- operator()(_Tp* __p, _Arg __x) const
- { (__p->*_M_f)(__x); }
- private:
- void (_Tp::*_M_f)(_Arg);
- };
-
- /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
- template <class _Tp, class _Arg>
- class const_mem_fun1_t<void, _Tp, _Arg>
- : public binary_function<const _Tp*, _Arg, void>
- {
- public:
- explicit
- const_mem_fun1_t(void (_Tp::*__pf)(_Arg) const)
- : _M_f(__pf) {}
-
- void
- operator()(const _Tp* __p, _Arg __x) const
- { (__p->*_M_f)(__x); }
- private:
- void (_Tp::*_M_f)(_Arg) const;
- };
-
- /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
- template <class _Tp, class _Arg>
- class mem_fun1_ref_t<void, _Tp, _Arg>
- : public binary_function<_Tp, _Arg, void>
- {
- public:
- explicit
- mem_fun1_ref_t(void (_Tp::*__pf)(_Arg))
- : _M_f(__pf) {}
-
- void
- operator()(_Tp& __r, _Arg __x) const
- { (__r.*_M_f)(__x); }
- private:
- void (_Tp::*_M_f)(_Arg);
- };
-
- /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
- template <class _Tp, class _Arg>
- class const_mem_fun1_ref_t<void, _Tp, _Arg>
- : public binary_function<_Tp, _Arg, void>
- {
- public:
- explicit
- const_mem_fun1_ref_t(void (_Tp::*__pf)(_Arg) const)
- : _M_f(__pf) {}
-
- void
- operator()(const _Tp& __r, _Arg __x) const
- { (__r.*_M_f)(__x); }
private:
- void (_Tp::*_M_f)(_Arg) const;
- };
+ _Ret (_Tp::*_M_f)(_Arg) const;
+ } _GLIBCXX11_DEPRECATED;
// Mem_fun adaptor helper functions. There are only two:
// mem_fun and mem_fun_ref.
- template <class _Ret, class _Tp>
+ template<typename _Ret, typename _Tp>
+ _GLIBCXX11_DEPRECATED_SUGGEST("std::mem_fn")
inline mem_fun_t<_Ret, _Tp>
mem_fun(_Ret (_Tp::*__f)())
{ return mem_fun_t<_Ret, _Tp>(__f); }
- template <class _Ret, class _Tp>
+ template<typename _Ret, typename _Tp>
+ _GLIBCXX11_DEPRECATED_SUGGEST("std::mem_fn")
inline const_mem_fun_t<_Ret, _Tp>
mem_fun(_Ret (_Tp::*__f)() const)
{ return const_mem_fun_t<_Ret, _Tp>(__f); }
- template <class _Ret, class _Tp>
+ template<typename _Ret, typename _Tp>
+ _GLIBCXX11_DEPRECATED_SUGGEST("std::mem_fn")
inline mem_fun_ref_t<_Ret, _Tp>
mem_fun_ref(_Ret (_Tp::*__f)())
{ return mem_fun_ref_t<_Ret, _Tp>(__f); }
- template <class _Ret, class _Tp>
+ template<typename _Ret, typename _Tp>
+ _GLIBCXX11_DEPRECATED_SUGGEST("std::mem_fn")
inline const_mem_fun_ref_t<_Ret, _Tp>
mem_fun_ref(_Ret (_Tp::*__f)() const)
{ return const_mem_fun_ref_t<_Ret, _Tp>(__f); }
- template <class _Ret, class _Tp, class _Arg>
+ template<typename _Ret, typename _Tp, typename _Arg>
+ _GLIBCXX11_DEPRECATED_SUGGEST("std::mem_fn")
inline mem_fun1_t<_Ret, _Tp, _Arg>
mem_fun(_Ret (_Tp::*__f)(_Arg))
{ return mem_fun1_t<_Ret, _Tp, _Arg>(__f); }
- template <class _Ret, class _Tp, class _Arg>
+ template<typename _Ret, typename _Tp, typename _Arg>
+ _GLIBCXX11_DEPRECATED_SUGGEST("std::mem_fn")
inline const_mem_fun1_t<_Ret, _Tp, _Arg>
mem_fun(_Ret (_Tp::*__f)(_Arg) const)
{ return const_mem_fun1_t<_Ret, _Tp, _Arg>(__f); }
- template <class _Ret, class _Tp, class _Arg>
+ template<typename _Ret, typename _Tp, typename _Arg>
+ _GLIBCXX11_DEPRECATED_SUGGEST("std::mem_fn")
inline mem_fun1_ref_t<_Ret, _Tp, _Arg>
mem_fun_ref(_Ret (_Tp::*__f)(_Arg))
{ return mem_fun1_ref_t<_Ret, _Tp, _Arg>(__f); }
- template <class _Ret, class _Tp, class _Arg>
+ template<typename _Ret, typename _Tp, typename _Arg>
+ _GLIBCXX11_DEPRECATED_SUGGEST("std::mem_fn")
inline const_mem_fun1_ref_t<_Ret, _Tp, _Arg>
mem_fun_ref(_Ret (_Tp::*__f)(_Arg) const)
{ return const_mem_fun1_ref_t<_Ret, _Tp, _Arg>(__f); }
+#pragma GCC diagnostic pop
/** @} */
-} // namespace std
+#ifdef __glibcxx_transparent_operators // C++ >= 14
+ template<typename _Func, typename _SfinaeType, typename = __void_t<>>
+ struct __has_is_transparent
+ { };
+
+ template<typename _Func, typename _SfinaeType>
+ struct __has_is_transparent<_Func, _SfinaeType,
+ __void_t<typename _Func::is_transparent>>
+ { typedef void type; };
+
+ template<typename _Func, typename _SfinaeType>
+ using __has_is_transparent_t
+ = typename __has_is_transparent<_Func, _SfinaeType>::type;
+#endif
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
-#endif /* _FUNCTION_H */
+#if (__cplusplus < 201103L) || _GLIBCXX_USE_DEPRECATED
+# include <backward/binders.h>
+#endif
-// Local Variables:
-// mode:C++
-// End:
+#endif /* _STL_FUNCTION_H */
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