1 // Allocator traits -*- C++ -*-
3 // Copyright (C) 2011-2018 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 /** @file ext/alloc_traits.h
26 * This file is a GNU extension to the Standard C++ Library.
29 #ifndef _EXT_ALLOC_TRAITS_H
30 #define _EXT_ALLOC_TRAITS_H 1
32 #pragma GCC system_header
34 #if __cplusplus >= 201103L
35 # include <bits/move.h>
36 # include <bits/alloc_traits.h>
38 # include <bits/allocator.h> // for __alloc_swap
41 namespace __gnu_cxx
_GLIBCXX_VISIBILITY(default)
43 _GLIBCXX_BEGIN_NAMESPACE_VERSION
46 * @brief Uniform interface to C++98 and C++11 allocators.
49 template<typename _Alloc
, typename
= typename
_Alloc::value_type
>
51 #if __cplusplus >= 201103L
52 : std::allocator_traits
<_Alloc
>
55 typedef _Alloc allocator_type
;
56 #if __cplusplus >= 201103L
57 typedef std::allocator_traits
<_Alloc
> _Base_type
;
58 typedef typename
_Base_type::value_type value_type
;
59 typedef typename
_Base_type::pointer pointer
;
60 typedef typename
_Base_type::const_pointer const_pointer
;
61 typedef typename
_Base_type::size_type size_type
;
62 typedef typename
_Base_type::difference_type difference_type
;
63 // C++11 allocators do not define reference or const_reference
64 typedef value_type
& reference
;
65 typedef const value_type
& const_reference
;
66 using _Base_type::allocate
;
67 using _Base_type::deallocate
;
68 using _Base_type::construct
;
69 using _Base_type::destroy
;
70 using _Base_type::max_size
;
73 template<typename _Ptr
>
74 using __is_custom_pointer
75 = std::__and_
<std::is_same
<pointer
, _Ptr
>,
76 std::__not_
<std::is_pointer
<_Ptr
>>>;
79 // overload construct for non-standard pointer types
80 template<typename _Ptr
, typename
... _Args
>
81 static typename
std::enable_if
<__is_custom_pointer
<_Ptr
>::value
>::type
82 construct(_Alloc
& __a
, _Ptr __p
, _Args
&&... __args
)
84 _Base_type::construct(__a
, std::__to_address(__p
),
85 std::forward
<_Args
>(__args
)...);
88 // overload destroy for non-standard pointer types
89 template<typename _Ptr
>
90 static typename
std::enable_if
<__is_custom_pointer
<_Ptr
>::value
>::type
91 destroy(_Alloc
& __a
, _Ptr __p
)
92 { _Base_type::destroy(__a
, std::__to_address(__p
)); }
94 static _Alloc
_S_select_on_copy(const _Alloc
& __a
)
95 { return _Base_type::select_on_container_copy_construction(__a
); }
97 static void _S_on_swap(_Alloc
& __a
, _Alloc
& __b
)
98 { std::__alloc_on_swap(__a
, __b
); }
100 static constexpr bool _S_propagate_on_copy_assign()
101 { return _Base_type::propagate_on_container_copy_assignment::value
; }
103 static constexpr bool _S_propagate_on_move_assign()
104 { return _Base_type::propagate_on_container_move_assignment::value
; }
106 static constexpr bool _S_propagate_on_swap()
107 { return _Base_type::propagate_on_container_swap::value
; }
109 static constexpr bool _S_always_equal()
110 { return _Base_type::is_always_equal::value
; }
112 static constexpr bool _S_nothrow_move()
113 { return _S_propagate_on_move_assign() || _S_always_equal(); }
115 template<typename _Tp
>
117 { typedef typename
_Base_type::template rebind_alloc
<_Tp
> other
; };
120 typedef typename
_Alloc::pointer pointer
;
121 typedef typename
_Alloc::const_pointer const_pointer
;
122 typedef typename
_Alloc::value_type value_type
;
123 typedef typename
_Alloc::reference reference
;
124 typedef typename
_Alloc::const_reference const_reference
;
125 typedef typename
_Alloc::size_type size_type
;
126 typedef typename
_Alloc::difference_type difference_type
;
129 allocate(_Alloc
& __a
, size_type __n
)
130 { return __a
.allocate(__n
); }
132 static void deallocate(_Alloc
& __a
, pointer __p
, size_type __n
)
133 { __a
.deallocate(__p
, __n
); }
135 template<typename _Tp
>
136 static void construct(_Alloc
& __a
, pointer __p
, const _Tp
& __arg
)
137 { __a
.construct(__p
, __arg
); }
139 static void destroy(_Alloc
& __a
, pointer __p
)
140 { __a
.destroy(__p
); }
142 static size_type
max_size(const _Alloc
& __a
)
143 { return __a
.max_size(); }
145 static const _Alloc
& _S_select_on_copy(const _Alloc
& __a
) { return __a
; }
147 static void _S_on_swap(_Alloc
& __a
, _Alloc
& __b
)
149 // _GLIBCXX_RESOLVE_LIB_DEFECTS
150 // 431. Swapping containers with unequal allocators.
151 std::__alloc_swap
<_Alloc
>::_S_do_it(__a
, __b
);
154 template<typename _Tp
>
156 { typedef typename
_Alloc::template rebind
<_Tp
>::other other
; };
160 _GLIBCXX_END_NAMESPACE_VERSION
161 } // namespace __gnu_cxx