1 // Uses-allocator Construction -*- C++ -*-
3 // Copyright (C) 2010-2017 Free Software Foundation, Inc.
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
25 #ifndef _USES_ALLOCATOR_H
26 #define _USES_ALLOCATOR_H 1
28 #if __cplusplus < 201103L
29 # include <bits/c++0x_warning.h>
32 #include <type_traits>
33 #include <bits/move.h>
35 namespace std
_GLIBCXX_VISIBILITY(default)
37 _GLIBCXX_BEGIN_NAMESPACE_VERSION
39 struct __erased_type
{ };
41 template<typename _Alloc
, typename _Tp
>
42 using __is_erased_or_convertible
43 = __or_
<is_same
<_Tp
, __erased_type
>, is_convertible
<_Alloc
, _Tp
>>;
46 struct allocator_arg_t
{ explicit allocator_arg_t() = default; };
48 _GLIBCXX17_INLINE
constexpr allocator_arg_t allocator_arg
=
51 template<typename _Tp
, typename _Alloc
, typename
= __void_t
<>>
52 struct __uses_allocator_helper
55 template<typename _Tp
, typename _Alloc
>
56 struct __uses_allocator_helper
<_Tp
, _Alloc
,
57 __void_t
<typename
_Tp::allocator_type
>>
58 : __is_erased_or_convertible
<_Alloc
, typename
_Tp::allocator_type
>::type
61 /// [allocator.uses.trait]
62 template<typename _Tp
, typename _Alloc
>
64 : __uses_allocator_helper
<_Tp
, _Alloc
>::type
67 struct __uses_alloc_base
{ };
69 struct __uses_alloc0
: __uses_alloc_base
71 struct _Sink
{ void operator=(const void*) { } } _M_a
;
74 template<typename _Alloc
>
75 struct __uses_alloc1
: __uses_alloc_base
{ const _Alloc
* _M_a
; };
77 template<typename _Alloc
>
78 struct __uses_alloc2
: __uses_alloc_base
{ const _Alloc
* _M_a
; };
80 template<bool, typename _Tp
, typename _Alloc
, typename
... _Args
>
83 template<typename _Tp
, typename _Alloc
, typename
... _Args
>
84 struct __uses_alloc
<true, _Tp
, _Alloc
, _Args
...>
86 is_constructible
<_Tp
, allocator_arg_t
, _Alloc
, _Args
...>::value
,
87 __uses_alloc1
<_Alloc
>,
88 __uses_alloc2
<_Alloc
>>::type
91 is_constructible
<_Tp
, allocator_arg_t
, _Alloc
, _Args
...>,
92 is_constructible
<_Tp
, _Args
..., _Alloc
>>::value
, "construction with"
93 " an allocator must be possible if uses_allocator is true");
96 template<typename _Tp
, typename _Alloc
, typename
... _Args
>
97 struct __uses_alloc
<false, _Tp
, _Alloc
, _Args
...>
100 template<typename _Tp
, typename _Alloc
, typename
... _Args
>
101 using __uses_alloc_t
=
102 __uses_alloc
<uses_allocator
<_Tp
, _Alloc
>::value
, _Tp
, _Alloc
, _Args
...>;
104 template<typename _Tp
, typename _Alloc
, typename
... _Args
>
105 inline __uses_alloc_t
<_Tp
, _Alloc
, _Args
...>
106 __use_alloc(const _Alloc
& __a
)
108 __uses_alloc_t
<_Tp
, _Alloc
, _Args
...> __ret
;
109 __ret
._M_a
= std::__addressof(__a
);
113 template<typename _Tp
, typename _Alloc
, typename
... _Args
>
115 __use_alloc(const _Alloc
&&) = delete;
117 #if __cplusplus > 201402L
118 template <typename _Tp
, typename _Alloc
>
119 inline constexpr bool uses_allocator_v
=
120 uses_allocator
<_Tp
, _Alloc
>::value
;
123 template<template<typename
...> class _Predicate
,
124 typename _Tp
, typename _Alloc
, typename
... _Args
>
125 struct __is_uses_allocator_predicate
126 : conditional
<uses_allocator
<_Tp
, _Alloc
>::value
,
127 __or_
<_Predicate
<_Tp
, allocator_arg_t
, _Alloc
, _Args
...>,
128 _Predicate
<_Tp
, _Args
..., _Alloc
>>,
129 _Predicate
<_Tp
, _Args
...>>::type
{ };
131 template<typename _Tp
, typename _Alloc
, typename
... _Args
>
132 struct __is_uses_allocator_constructible
133 : __is_uses_allocator_predicate
<is_constructible
, _Tp
, _Alloc
, _Args
...>
136 #if __cplusplus >= 201402L
137 template<typename _Tp
, typename _Alloc
, typename
... _Args
>
138 _GLIBCXX17_INLINE
constexpr bool __is_uses_allocator_constructible_v
=
139 __is_uses_allocator_constructible
<_Tp
, _Alloc
, _Args
...>::value
;
142 template<typename _Tp
, typename _Alloc
, typename
... _Args
>
143 struct __is_nothrow_uses_allocator_constructible
144 : __is_uses_allocator_predicate
<is_nothrow_constructible
,
145 _Tp
, _Alloc
, _Args
...>
149 #if __cplusplus >= 201402L
150 template<typename _Tp
, typename _Alloc
, typename
... _Args
>
151 _GLIBCXX17_INLINE
constexpr bool
152 __is_nothrow_uses_allocator_constructible_v
=
153 __is_nothrow_uses_allocator_constructible
<_Tp
, _Alloc
, _Args
...>::value
;
156 template<typename _Tp
, typename
... _Args
>
157 void __uses_allocator_construct_impl(__uses_alloc0 __a
, _Tp
* __ptr
,
159 { ::new ((void*)__ptr
) _Tp(std::forward
<_Args
>(__args
)...); }
161 template<typename _Tp
, typename _Alloc
, typename
... _Args
>
162 void __uses_allocator_construct_impl(__uses_alloc1
<_Alloc
> __a
, _Tp
* __ptr
,
165 ::new ((void*)__ptr
) _Tp(allocator_arg
, *__a
._M_a
,
166 std::forward
<_Args
>(__args
)...);
169 template<typename _Tp
, typename _Alloc
, typename
... _Args
>
170 void __uses_allocator_construct_impl(__uses_alloc2
<_Alloc
> __a
, _Tp
* __ptr
,
172 { ::new ((void*)__ptr
) _Tp(std::forward
<_Args
>(__args
)..., *__a
._M_a
); }
174 template<typename _Tp
, typename _Alloc
, typename
... _Args
>
175 void __uses_allocator_construct(const _Alloc
& __a
, _Tp
* __ptr
,
178 __uses_allocator_construct_impl(__use_alloc
<_Tp
, _Alloc
, _Args
...>(__a
),
179 __ptr
, std::forward
<_Args
>(__args
)...);
182 _GLIBCXX_END_NAMESPACE_VERSION