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1425 lines
43 KiB
1425 lines
43 KiB
// Functor implementations -*- C++ -*-
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// Copyright (C) 2001-2021 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/*
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*
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* Copyright (c) 1994
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* Hewlett-Packard Company
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Hewlett-Packard Company makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*
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*
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* Copyright (c) 1996-1998
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* Silicon Graphics Computer Systems, Inc.
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Silicon Graphics makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*/
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/** @file bits/stl_function.h
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{functional}
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*/
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#ifndef _STL_FUNCTION_H
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#define _STL_FUNCTION_H 1
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#if __cplusplus > 201103L
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#include <bits/move.h>
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#endif
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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// 20.3.1 base classes
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/** @defgroup functors Function Objects
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* @ingroup utilities
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*
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* Function objects, or _functors_, are objects with an `operator()`
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* defined and accessible. They can be passed as arguments to algorithm
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* templates and used in place of a function pointer. Not only is the
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* resulting expressiveness of the library increased, but the generated
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* code can be more efficient than what you might write by hand. When we
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* refer to _functors_, then, generally we include function pointers in
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* the description as well.
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*
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* Often, functors are only created as temporaries passed to algorithm
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* calls, rather than being created as named variables.
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*
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* Two examples taken from the standard itself follow. To perform a
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* by-element addition of two vectors `a` and `b` containing `double`,
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* and put the result in `a`, use
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* \code
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* transform (a.begin(), a.end(), b.begin(), a.begin(), plus<double>());
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* \endcode
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* To negate every element in `a`, use
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* \code
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* transform(a.begin(), a.end(), a.begin(), negate<double>());
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* \endcode
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* The addition and negation functions will usually be inlined directly.
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*
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* An _adaptable function object_ is one which provides nested typedefs
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* `result_type` and either `argument_type` (for a unary function) or
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* `first_argument_type` and `second_argument_type` (for a binary function).
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* Those typedefs are used by function object adaptors such as `bind2nd`.
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* The standard library provides two class templates, `unary_function` and
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* `binary_function`, which define those typedefs and so can be used as
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* base classes of adaptable function objects.
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*
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* Since C++11 the use of function object adaptors has been superseded by
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* more powerful tools such as lambda expressions, `function<>`, and more
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* powerful type deduction (using `auto` and `decltype`). The helpers for
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* defining adaptable function objects are deprecated since C++11, and no
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* longer part of the standard library since C++17. However, they are still
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* defined and used by libstdc++ after C++17, as a conforming extension.
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*
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* @{
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*/
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/**
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* Helper for defining adaptable unary function objects.
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* @deprecated Deprecated in C++11, no longer in the standard since C++17.
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*/
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template<typename _Arg, typename _Result>
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struct unary_function
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{
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/// @c argument_type is the type of the argument
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typedef _Arg argument_type;
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/// @c result_type is the return type
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typedef _Result result_type;
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};
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/**
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* Helper for defining adaptable binary function objects.
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* @deprecated Deprecated in C++11, no longer in the standard since C++17.
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*/
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template<typename _Arg1, typename _Arg2, typename _Result>
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struct binary_function
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{
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/// @c first_argument_type is the type of the first argument
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typedef _Arg1 first_argument_type;
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/// @c second_argument_type is the type of the second argument
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typedef _Arg2 second_argument_type;
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/// @c result_type is the return type
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typedef _Result result_type;
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};
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/** @} */
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// 20.3.2 arithmetic
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/** @defgroup arithmetic_functors Arithmetic Function Object Classes
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* @ingroup functors
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*
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* The library provides function objects for basic arithmetic operations.
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* See the documentation for @link functors function objects @endlink
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* for examples of their use.
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*
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* @{
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*/
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#if __cplusplus > 201103L
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struct __is_transparent; // undefined
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template<typename _Tp = void>
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struct plus;
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template<typename _Tp = void>
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struct minus;
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template<typename _Tp = void>
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struct multiplies;
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template<typename _Tp = void>
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struct divides;
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template<typename _Tp = void>
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struct modulus;
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template<typename _Tp = void>
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struct negate;
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#endif
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/// One of the @link arithmetic_functors math functors@endlink.
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template<typename _Tp>
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struct plus : public binary_function<_Tp, _Tp, _Tp>
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{
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/// Returns the sum
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_GLIBCXX14_CONSTEXPR
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_Tp
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operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x + __y; }
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};
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/// One of the @link arithmetic_functors math functors@endlink.
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template<typename _Tp>
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struct minus : public binary_function<_Tp, _Tp, _Tp>
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{
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_GLIBCXX14_CONSTEXPR
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_Tp
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operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x - __y; }
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};
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/// One of the @link arithmetic_functors math functors@endlink.
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template<typename _Tp>
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struct multiplies : public binary_function<_Tp, _Tp, _Tp>
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{
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_GLIBCXX14_CONSTEXPR
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_Tp
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operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x * __y; }
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};
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/// One of the @link arithmetic_functors math functors@endlink.
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template<typename _Tp>
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struct divides : public binary_function<_Tp, _Tp, _Tp>
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{
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_GLIBCXX14_CONSTEXPR
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_Tp
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operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x / __y; }
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};
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/// One of the @link arithmetic_functors math functors@endlink.
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template<typename _Tp>
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struct modulus : public binary_function<_Tp, _Tp, _Tp>
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{
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_GLIBCXX14_CONSTEXPR
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_Tp
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operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x % __y; }
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};
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/// One of the @link arithmetic_functors math functors@endlink.
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template<typename _Tp>
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struct negate : public unary_function<_Tp, _Tp>
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{
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_GLIBCXX14_CONSTEXPR
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_Tp
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operator()(const _Tp& __x) const
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{ return -__x; }
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};
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#if __cplusplus > 201103L
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#define __cpp_lib_transparent_operators 201510
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template<>
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struct plus<void>
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{
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template <typename _Tp, typename _Up>
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_GLIBCXX14_CONSTEXPR
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auto
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operator()(_Tp&& __t, _Up&& __u) const
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noexcept(noexcept(std::forward<_Tp>(__t) + std::forward<_Up>(__u)))
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-> decltype(std::forward<_Tp>(__t) + std::forward<_Up>(__u))
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{ return std::forward<_Tp>(__t) + std::forward<_Up>(__u); }
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typedef __is_transparent is_transparent;
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};
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/// One of the @link arithmetic_functors math functors@endlink.
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template<>
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struct minus<void>
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{
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template <typename _Tp, typename _Up>
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_GLIBCXX14_CONSTEXPR
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auto
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operator()(_Tp&& __t, _Up&& __u) const
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noexcept(noexcept(std::forward<_Tp>(__t) - std::forward<_Up>(__u)))
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-> decltype(std::forward<_Tp>(__t) - std::forward<_Up>(__u))
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{ return std::forward<_Tp>(__t) - std::forward<_Up>(__u); }
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typedef __is_transparent is_transparent;
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};
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/// One of the @link arithmetic_functors math functors@endlink.
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template<>
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struct multiplies<void>
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{
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template <typename _Tp, typename _Up>
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_GLIBCXX14_CONSTEXPR
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auto
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operator()(_Tp&& __t, _Up&& __u) const
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noexcept(noexcept(std::forward<_Tp>(__t) * std::forward<_Up>(__u)))
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-> decltype(std::forward<_Tp>(__t) * std::forward<_Up>(__u))
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{ return std::forward<_Tp>(__t) * std::forward<_Up>(__u); }
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typedef __is_transparent is_transparent;
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};
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/// One of the @link arithmetic_functors math functors@endlink.
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template<>
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struct divides<void>
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{
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template <typename _Tp, typename _Up>
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_GLIBCXX14_CONSTEXPR
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auto
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operator()(_Tp&& __t, _Up&& __u) const
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noexcept(noexcept(std::forward<_Tp>(__t) / std::forward<_Up>(__u)))
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-> decltype(std::forward<_Tp>(__t) / std::forward<_Up>(__u))
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{ return std::forward<_Tp>(__t) / std::forward<_Up>(__u); }
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typedef __is_transparent is_transparent;
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};
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/// One of the @link arithmetic_functors math functors@endlink.
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template<>
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struct modulus<void>
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{
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template <typename _Tp, typename _Up>
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_GLIBCXX14_CONSTEXPR
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auto
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operator()(_Tp&& __t, _Up&& __u) const
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noexcept(noexcept(std::forward<_Tp>(__t) % std::forward<_Up>(__u)))
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-> decltype(std::forward<_Tp>(__t) % std::forward<_Up>(__u))
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{ return std::forward<_Tp>(__t) % std::forward<_Up>(__u); }
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typedef __is_transparent is_transparent;
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};
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/// One of the @link arithmetic_functors math functors@endlink.
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template<>
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struct negate<void>
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{
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template <typename _Tp>
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_GLIBCXX14_CONSTEXPR
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auto
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operator()(_Tp&& __t) const
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noexcept(noexcept(-std::forward<_Tp>(__t)))
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-> decltype(-std::forward<_Tp>(__t))
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{ return -std::forward<_Tp>(__t); }
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typedef __is_transparent is_transparent;
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};
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#endif
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/** @} */
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// 20.3.3 comparisons
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/** @defgroup comparison_functors Comparison Classes
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* @ingroup functors
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*
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* The library provides six wrapper functors for all the basic comparisons
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* in C++, like @c <.
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*
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* @{
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*/
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#if __cplusplus > 201103L
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template<typename _Tp = void>
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struct equal_to;
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template<typename _Tp = void>
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struct not_equal_to;
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template<typename _Tp = void>
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struct greater;
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template<typename _Tp = void>
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struct less;
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template<typename _Tp = void>
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struct greater_equal;
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template<typename _Tp = void>
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struct less_equal;
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#endif
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/// One of the @link comparison_functors comparison functors@endlink.
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template<typename _Tp>
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struct equal_to : public binary_function<_Tp, _Tp, bool>
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{
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_GLIBCXX14_CONSTEXPR
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bool
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operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x == __y; }
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};
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/// One of the @link comparison_functors comparison functors@endlink.
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template<typename _Tp>
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struct not_equal_to : public binary_function<_Tp, _Tp, bool>
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{
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_GLIBCXX14_CONSTEXPR
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bool
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operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x != __y; }
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};
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/// One of the @link comparison_functors comparison functors@endlink.
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template<typename _Tp>
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struct greater : public binary_function<_Tp, _Tp, bool>
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{
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_GLIBCXX14_CONSTEXPR
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bool
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operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x > __y; }
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};
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/// One of the @link comparison_functors comparison functors@endlink.
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template<typename _Tp>
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struct less : public binary_function<_Tp, _Tp, bool>
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{
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_GLIBCXX14_CONSTEXPR
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bool
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operator()(const _Tp& __x, const _Tp& __y) const
|
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{ return __x < __y; }
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};
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|
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/// One of the @link comparison_functors comparison functors@endlink.
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template<typename _Tp>
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struct greater_equal : public binary_function<_Tp, _Tp, bool>
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{
|
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_GLIBCXX14_CONSTEXPR
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bool
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operator()(const _Tp& __x, const _Tp& __y) const
|
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{ return __x >= __y; }
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};
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|
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/// One of the @link comparison_functors comparison functors@endlink.
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template<typename _Tp>
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struct less_equal : public binary_function<_Tp, _Tp, bool>
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{
|
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_GLIBCXX14_CONSTEXPR
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|
bool
|
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operator()(const _Tp& __x, const _Tp& __y) const
|
|
{ return __x <= __y; }
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|
};
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|
|
// Partial specialization of std::greater for pointers.
|
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template<typename _Tp>
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struct greater<_Tp*> : public binary_function<_Tp*, _Tp*, bool>
|
|
{
|
|
_GLIBCXX14_CONSTEXPR bool
|
|
operator()(_Tp* __x, _Tp* __y) const _GLIBCXX_NOTHROW
|
|
{
|
|
#if __cplusplus >= 201402L
|
|
#ifdef _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED
|
|
if (__builtin_is_constant_evaluated())
|
|
#else
|
|
if (__builtin_constant_p(__x > __y))
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|
#endif
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|
return __x > __y;
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|
#endif
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|
return (__UINTPTR_TYPE__)__x > (__UINTPTR_TYPE__)__y;
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|
}
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|
};
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|
|
// 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
|
|
#ifdef _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED
|
|
if (__builtin_is_constant_evaluated())
|
|
#else
|
|
if (__builtin_constant_p(__x < __y))
|
|
#endif
|
|
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
|
|
#ifdef _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED
|
|
if (__builtin_is_constant_evaluated())
|
|
#else
|
|
if (__builtin_constant_p(__x >= __y))
|
|
#endif
|
|
return __x >= __y;
|
|
#endif
|
|
return (__UINTPTR_TYPE__)__x >= (__UINTPTR_TYPE__)__y;
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|
}
|
|
};
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|
|
// Partial specialization of std::less_equal for pointers.
|
|
template<typename _Tp>
|
|
struct less_equal<_Tp*> : public binary_function<_Tp*, _Tp*, bool>
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|
{
|
|
_GLIBCXX14_CONSTEXPR bool
|
|
operator()(_Tp* __x, _Tp* __y) const _GLIBCXX_NOTHROW
|
|
{
|
|
#if __cplusplus >= 201402L
|
|
#ifdef _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED
|
|
if (__builtin_is_constant_evaluated())
|
|
#else
|
|
if (__builtin_constant_p(__x <= __y))
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|
#endif
|
|
return __x <= __y;
|
|
#endif
|
|
return (__UINTPTR_TYPE__)__x <= (__UINTPTR_TYPE__)__y;
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|
}
|
|
};
|
|
|
|
#if __cplusplus >= 201402L
|
|
/// 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;
|
|
};
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|
|
/// 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 // C++14
|
|
/** @} */
|
|
|
|
// 20.3.4 logical operations
|
|
/** @defgroup logical_functors Boolean Operations Classes
|
|
* @ingroup functors
|
|
*
|
|
* The library provides function objects for the logical operations:
|
|
* `&&`, `||`, and `!`.
|
|
*
|
|
* @{
|
|
*/
|
|
#if __cplusplus > 201103L
|
|
template<typename _Tp = void>
|
|
struct logical_and;
|
|
|
|
template<typename _Tp = void>
|
|
struct logical_or;
|
|
|
|
template<typename _Tp = void>
|
|
struct logical_not;
|
|
#endif
|
|
|
|
/// 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 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 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; }
|
|
};
|
|
|
|
#if __cplusplus > 201103L
|
|
/// 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
|
|
/** @} */
|
|
|
|
#if __cplusplus > 201103L
|
|
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
|
|
|
|
// _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; }
|
|
};
|
|
|
|
#if __cplusplus > 201103L
|
|
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
|
|
|
|
// 20.3.5 negators
|
|
/** @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) const { return x > 3; }
|
|
* };
|
|
*
|
|
* std::find_if (v.begin(), v.end(), not1(IntGreaterThanThree()));
|
|
* \endcode
|
|
* 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 taking
|
|
* two arguments.
|
|
*
|
|
* @deprecated Deprecated in C++17, no longer in the standard since C++20.
|
|
* Use `not_fn` instead.
|
|
*
|
|
* @{
|
|
*/
|
|
/// One of the @link negators negation functors@endlink.
|
|
template<typename _Predicate>
|
|
class 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) { }
|
|
|
|
_GLIBCXX14_CONSTEXPR
|
|
bool
|
|
operator()(const typename _Predicate::argument_type& __x) const
|
|
{ return !_M_pred(__x); }
|
|
};
|
|
|
|
/// One of the @link negators negation functors@endlink.
|
|
template<typename _Predicate>
|
|
_GLIBCXX14_CONSTEXPR
|
|
inline unary_negate<_Predicate>
|
|
not1(const _Predicate& __pred)
|
|
{ return unary_negate<_Predicate>(__pred); }
|
|
|
|
/// One of the @link negators negation functors@endlink.
|
|
template<typename _Predicate>
|
|
class binary_negate
|
|
: public binary_function<typename _Predicate::first_argument_type,
|
|
typename _Predicate::second_argument_type, bool>
|
|
{
|
|
protected:
|
|
_Predicate _M_pred;
|
|
|
|
public:
|
|
_GLIBCXX14_CONSTEXPR
|
|
explicit
|
|
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 negators negation functors@endlink.
|
|
template<typename _Predicate>
|
|
_GLIBCXX14_CONSTEXPR
|
|
inline binary_negate<_Predicate>
|
|
not2(const _Predicate& __pred)
|
|
{ return binary_negate<_Predicate>(__pred); }
|
|
/** @} */
|
|
|
|
// 20.3.7 adaptors pointers 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., `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 `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 `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 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() { }
|
|
|
|
explicit
|
|
pointer_to_unary_function(_Result (*__x)(_Arg))
|
|
: _M_ptr(__x) { }
|
|
|
|
_Result
|
|
operator()(_Arg __x) const
|
|
{ return _M_ptr(__x); }
|
|
};
|
|
|
|
/// One of the @link pointer_adaptors adaptors for function pointers@endlink.
|
|
template<typename _Arg, typename _Result>
|
|
inline pointer_to_unary_function<_Arg, _Result>
|
|
ptr_fun(_Result (*__x)(_Arg))
|
|
{ return pointer_to_unary_function<_Arg, _Result>(__x); }
|
|
|
|
/// 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() { }
|
|
|
|
explicit
|
|
pointer_to_binary_function(_Result (*__x)(_Arg1, _Arg2))
|
|
: _M_ptr(__x) { }
|
|
|
|
_Result
|
|
operator()(_Arg1 __x, _Arg2 __y) const
|
|
{ return _M_ptr(__x, __y); }
|
|
};
|
|
|
|
/// One of the @link pointer_adaptors adaptors for function pointers@endlink.
|
|
template<typename _Arg1, typename _Arg2, typename _Result>
|
|
inline pointer_to_binary_function<_Arg1, _Arg2, _Result>
|
|
ptr_fun(_Result (*__x)(_Arg1, _Arg2))
|
|
{ return pointer_to_binary_function<_Arg1, _Arg2, _Result>(__x); }
|
|
/** @} */
|
|
|
|
template<typename _Tp>
|
|
struct _Identity
|
|
: public unary_function<_Tp, _Tp>
|
|
{
|
|
_Tp&
|
|
operator()(_Tp& __x) const
|
|
{ return __x; }
|
|
|
|
const _Tp&
|
|
operator()(const _Tp& __x) const
|
|
{ return __x; }
|
|
};
|
|
|
|
// 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
|
|
{ return __x.first; }
|
|
|
|
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<typename _Pair>
|
|
struct _Select2nd
|
|
: public unary_function<_Pair, typename _Pair::second_type>
|
|
{
|
|
typename _Pair::second_type&
|
|
operator()(_Pair& __x) const
|
|
{ return __x.second; }
|
|
|
|
const typename _Pair::second_type&
|
|
operator()(const _Pair& __x) const
|
|
{ return __x.second; }
|
|
};
|
|
|
|
// 20.3.8 adaptors pointers members
|
|
/** @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) 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`,
|
|
* 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 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) { }
|
|
|
|
_Ret
|
|
operator()(_Tp* __p) const
|
|
{ return (__p->*_M_f)(); }
|
|
|
|
private:
|
|
_Ret (_Tp::*_M_f)();
|
|
};
|
|
|
|
/// 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) { }
|
|
|
|
_Ret
|
|
operator()(const _Tp* __p) const
|
|
{ return (__p->*_M_f)(); }
|
|
|
|
private:
|
|
_Ret (_Tp::*_M_f)() const;
|
|
};
|
|
|
|
/// 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) { }
|
|
|
|
_Ret
|
|
operator()(_Tp& __r) const
|
|
{ return (__r.*_M_f)(); }
|
|
|
|
private:
|
|
_Ret (_Tp::*_M_f)();
|
|
};
|
|
|
|
/// 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) { }
|
|
|
|
_Ret
|
|
operator()(const _Tp& __r) const
|
|
{ return (__r.*_M_f)(); }
|
|
|
|
private:
|
|
_Ret (_Tp::*_M_f)() const;
|
|
};
|
|
|
|
/// 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) { }
|
|
|
|
_Ret
|
|
operator()(_Tp* __p, _Arg __x) const
|
|
{ return (__p->*_M_f)(__x); }
|
|
|
|
private:
|
|
_Ret (_Tp::*_M_f)(_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) { }
|
|
|
|
_Ret
|
|
operator()(const _Tp* __p, _Arg __x) const
|
|
{ return (__p->*_M_f)(__x); }
|
|
|
|
private:
|
|
_Ret (_Tp::*_M_f)(_Arg) const;
|
|
};
|
|
|
|
/// 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) { }
|
|
|
|
_Ret
|
|
operator()(_Tp& __r, _Arg __x) const
|
|
{ return (__r.*_M_f)(__x); }
|
|
|
|
private:
|
|
_Ret (_Tp::*_M_f)(_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) { }
|
|
|
|
_Ret
|
|
operator()(const _Tp& __r, _Arg __x) const
|
|
{ return (__r.*_M_f)(__x); }
|
|
|
|
private:
|
|
_Ret (_Tp::*_M_f)(_Arg) const;
|
|
};
|
|
|
|
// Mem_fun adaptor helper functions. There are only two:
|
|
// mem_fun and mem_fun_ref.
|
|
template<typename _Ret, typename _Tp>
|
|
inline mem_fun_t<_Ret, _Tp>
|
|
mem_fun(_Ret (_Tp::*__f)())
|
|
{ return mem_fun_t<_Ret, _Tp>(__f); }
|
|
|
|
template<typename _Ret, typename _Tp>
|
|
inline const_mem_fun_t<_Ret, _Tp>
|
|
mem_fun(_Ret (_Tp::*__f)() const)
|
|
{ return const_mem_fun_t<_Ret, _Tp>(__f); }
|
|
|
|
template<typename _Ret, typename _Tp>
|
|
inline mem_fun_ref_t<_Ret, _Tp>
|
|
mem_fun_ref(_Ret (_Tp::*__f)())
|
|
{ return mem_fun_ref_t<_Ret, _Tp>(__f); }
|
|
|
|
template<typename _Ret, typename _Tp>
|
|
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<typename _Ret, typename _Tp, typename _Arg>
|
|
inline mem_fun1_t<_Ret, _Tp, _Arg>
|
|
mem_fun(_Ret (_Tp::*__f)(_Arg))
|
|
{ return mem_fun1_t<_Ret, _Tp, _Arg>(__f); }
|
|
|
|
template<typename _Ret, typename _Tp, typename _Arg>
|
|
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<typename _Ret, typename _Tp, typename _Arg>
|
|
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<typename _Ret, typename _Tp, typename _Arg>
|
|
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); }
|
|
|
|
/** @} */
|
|
|
|
#if __cplusplus >= 201402L
|
|
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
|
|
|
|
#if (__cplusplus < 201103L) || _GLIBCXX_USE_DEPRECATED
|
|
# include <backward/binders.h>
|
|
#endif
|
|
|
|
#endif /* _STL_FUNCTION_H */
|