1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
// Implementation of INVOKE -*- C++ -*-
// Copyright (C) 2016-2017 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 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// 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.
// 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/>.
/** @file include/bits/invoke.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{functional}
*/
#ifndef _GLIBCXX_INVOKE_H
#define _GLIBCXX_INVOKE_H 1
#pragma GCC system_header
#if __cplusplus < 201103L
# include <bits/c++0x_warning.h>
#else
#include <type_traits>
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/**
* @addtogroup utilities
* @{
*/
// Used by __invoke_impl instead of std::forward<_Tp> so that a
// reference_wrapper is converted to an lvalue-reference.
template<typename _Tp, typename _Up = typename __inv_unwrap<_Tp>::type>
constexpr _Up&&
__invfwd(typename remove_reference<_Tp>::type& __t) noexcept
{ return static_cast<_Up&&>(__t); }
template<typename _Res, typename _Fn, typename... _Args>
constexpr _Res
__invoke_impl(__invoke_other, _Fn&& __f, _Args&&... __args)
{ return std::forward<_Fn>(__f)(std::forward<_Args>(__args)...); }
template<typename _Res, typename _MemFun, typename _Tp, typename... _Args>
constexpr _Res
__invoke_impl(__invoke_memfun_ref, _MemFun&& __f, _Tp&& __t,
_Args&&... __args)
{ return (__invfwd<_Tp>(__t).*__f)(std::forward<_Args>(__args)...); }
template<typename _Res, typename _MemFun, typename _Tp, typename... _Args>
constexpr _Res
__invoke_impl(__invoke_memfun_deref, _MemFun&& __f, _Tp&& __t,
_Args&&... __args)
{
return ((*std::forward<_Tp>(__t)).*__f)(std::forward<_Args>(__args)...);
}
template<typename _Res, typename _MemPtr, typename _Tp>
constexpr _Res
__invoke_impl(__invoke_memobj_ref, _MemPtr&& __f, _Tp&& __t)
{ return __invfwd<_Tp>(__t).*__f; }
template<typename _Res, typename _MemPtr, typename _Tp>
constexpr _Res
__invoke_impl(__invoke_memobj_deref, _MemPtr&& __f, _Tp&& __t)
{ return (*std::forward<_Tp>(__t)).*__f; }
/// Invoke a callable object.
template<typename _Callable, typename... _Args>
constexpr typename result_of<_Callable&&(_Args&&...)>::type
__invoke(_Callable&& __fn, _Args&&... __args)
noexcept(__is_nothrow_callable<_Callable&&(_Args&&...)>::value)
{
using __result_of = result_of<_Callable&&(_Args&&...)>;
using __type = typename __result_of::type;
using __tag = typename __result_of::__invoke_type;
return std::__invoke_impl<__type>(__tag{}, std::forward<_Callable>(__fn),
std::forward<_Args>(__args)...);
}
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif // C++11
#endif // _GLIBCXX_INVOKE_H
|
