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1 | // Allocator traits -*- C++ -*- |
2 | ||
3 | // Copyright (C) 2011 Free Software Foundation, Inc. | |
4 | // | |
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) | |
9 | // any later version. | |
10 | ||
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. | |
15 | ||
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. | |
19 | ||
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/>. | |
24 | ||
25 | /** @file ext/alloc_traits.h | |
26 | * This file is a GNU extension to the Standard C++ Library. | |
27 | */ | |
28 | ||
29 | #ifndef _EXT_ALLOC_TRAITS_H | |
30 | #define _EXT_ALLOC_TRAITS_H 1 | |
31 | ||
32 | #pragma GCC system_header | |
33 | ||
34 | #ifdef __GXX_EXPERIMENTAL_CXX0X__ | |
35 | # include <bits/alloc_traits.h> | |
36 | #else | |
37 | # include <bits/allocator.h> // for __alloc_swap | |
38 | #endif | |
39 | ||
40 | namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) | |
41 | { | |
42 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
43 | ||
44 | /** | |
45 | * @brief Uniform interface to C++98 and C++0x allocators. | |
46 | * @ingroup allocators | |
47 | */ | |
48 | template<typename _Alloc> | |
49 | struct __alloc_traits | |
50 | #ifdef __GXX_EXPERIMENTAL_CXX0X__ | |
51 | : std::allocator_traits<_Alloc> | |
52 | #endif | |
53 | { | |
54 | typedef _Alloc allocator_type; | |
55 | #ifdef __GXX_EXPERIMENTAL_CXX0X__ | |
56 | typedef std::allocator_traits<_Alloc> _Base_type; | |
57 | typedef typename _Base_type::value_type value_type; | |
58 | typedef typename _Base_type::pointer pointer; | |
59 | typedef typename _Base_type::const_pointer const_pointer; | |
60 | typedef typename _Base_type::size_type size_type; | |
61 | // C++0x allocators do not define reference or const_reference | |
62 | typedef value_type& reference; | |
63 | typedef const value_type& const_reference; | |
64 | using _Base_type::allocate; | |
65 | using _Base_type::deallocate; | |
66 | using _Base_type::construct; | |
67 | using _Base_type::destroy; | |
68 | ||
69 | static _Alloc _S_select_on_copy(const _Alloc& __a) | |
70 | { return _Base_type::select_on_container_copy_construction(__a); } | |
71 | ||
72 | static void _S_on_swap(_Alloc& __a, _Alloc& __b) | |
73 | { std::__alloc_on_swap(__a, __b); } | |
74 | ||
75 | static constexpr bool _S_propagate_on_copy_assign() | |
76 | { return _Base_type::propagate_on_container_copy_assignment::value; } | |
77 | ||
78 | static constexpr bool _S_propagate_on_move_assign() | |
79 | { return _Base_type::propagate_on_container_move_assignment::value; } | |
80 | ||
81 | static constexpr bool _S_propagate_on_swap() | |
82 | { return _Base_type::propagate_on_container_swap::value; } | |
83 | ||
84 | #else | |
85 | ||
86 | typedef typename _Alloc::pointer pointer; | |
87 | typedef typename _Alloc::const_pointer const_pointer; | |
88 | typedef typename _Alloc::value_type value_type; | |
89 | typedef typename _Alloc::reference reference; | |
90 | typedef typename _Alloc::const_reference const_reference; | |
91 | typedef typename _Alloc::size_type size_type; | |
92 | ||
93 | static pointer | |
94 | allocate(_Alloc& __a, size_type __n) | |
95 | { return __a.allocate(__n); } | |
96 | ||
97 | static void deallocate(_Alloc& __a, pointer __p, size_type __n) | |
98 | { __a.deallocate(__p, __n); } | |
99 | ||
100 | template<typename _Tp> | |
101 | static void construct(_Alloc& __a, pointer __p, const _Tp& __arg) | |
102 | { __a.construct(__p, __arg); } | |
103 | ||
104 | static void destroy(_Alloc& __a, pointer __p) | |
105 | { __a.destroy(__p); } | |
106 | ||
107 | static const _Alloc& _S_select_on_copy(const _Alloc& __a) { return __a; } | |
108 | ||
109 | static void _S_on_swap(_Alloc& __a, _Alloc& __b) | |
110 | { | |
111 | // _GLIBCXX_RESOLVE_LIB_DEFECTS | |
112 | // 431. Swapping containers with unequal allocators. | |
113 | std::__alloc_swap<_Alloc>::_S_do_it(__a, __b); | |
114 | } | |
115 | #endif | |
116 | }; | |
117 | ||
118 | _GLIBCXX_END_NAMESPACE_VERSION | |
119 | } // namespace | |
120 | ||
121 | #endif |