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105 lines
3.6 KiB
C++
105 lines
3.6 KiB
C++
// Implementation of INVOKE -*- C++ -*-
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// Copyright (C) 2016-2018 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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/** @file include/bits/invoke.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 _GLIBCXX_INVOKE_H
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#define _GLIBCXX_INVOKE_H 1
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#pragma GCC system_header
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#if __cplusplus < 201103L
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# include <bits/c++0x_warning.h>
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#else
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#include <type_traits>
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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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/**
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* @addtogroup utilities
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* @{
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*/
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// Used by __invoke_impl instead of std::forward<_Tp> so that a
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// reference_wrapper is converted to an lvalue-reference.
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template<typename _Tp, typename _Up = typename __inv_unwrap<_Tp>::type>
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constexpr _Up&&
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__invfwd(typename remove_reference<_Tp>::type& __t) noexcept
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{ return static_cast<_Up&&>(__t); }
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template<typename _Res, typename _Fn, typename... _Args>
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constexpr _Res
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__invoke_impl(__invoke_other, _Fn&& __f, _Args&&... __args)
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{ return std::forward<_Fn>(__f)(std::forward<_Args>(__args)...); }
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template<typename _Res, typename _MemFun, typename _Tp, typename... _Args>
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constexpr _Res
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__invoke_impl(__invoke_memfun_ref, _MemFun&& __f, _Tp&& __t,
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_Args&&... __args)
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{ return (__invfwd<_Tp>(__t).*__f)(std::forward<_Args>(__args)...); }
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template<typename _Res, typename _MemFun, typename _Tp, typename... _Args>
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constexpr _Res
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__invoke_impl(__invoke_memfun_deref, _MemFun&& __f, _Tp&& __t,
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_Args&&... __args)
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{
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return ((*std::forward<_Tp>(__t)).*__f)(std::forward<_Args>(__args)...);
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}
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template<typename _Res, typename _MemPtr, typename _Tp>
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constexpr _Res
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__invoke_impl(__invoke_memobj_ref, _MemPtr&& __f, _Tp&& __t)
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{ return __invfwd<_Tp>(__t).*__f; }
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template<typename _Res, typename _MemPtr, typename _Tp>
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constexpr _Res
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__invoke_impl(__invoke_memobj_deref, _MemPtr&& __f, _Tp&& __t)
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{ return (*std::forward<_Tp>(__t)).*__f; }
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/// Invoke a callable object.
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template<typename _Callable, typename... _Args>
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constexpr typename __invoke_result<_Callable, _Args...>::type
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__invoke(_Callable&& __fn, _Args&&... __args)
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noexcept(__is_nothrow_invocable<_Callable, _Args...>::value)
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{
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using __result = __invoke_result<_Callable, _Args...>;
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using __type = typename __result::type;
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using __tag = typename __result::__invoke_type;
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return std::__invoke_impl<__type>(__tag{}, std::forward<_Callable>(__fn),
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std::forward<_Args>(__args)...);
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}
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace std
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#endif // C++11
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#endif // _GLIBCXX_INVOKE_H
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