1 | // Allocators -*- C++ -*- |
2 | |
3 | // Copyright (C) 2001-2014 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 | /* |
26 | * Copyright (c) 1996-1997 |
27 | * Silicon Graphics Computer Systems, Inc. |
28 | * |
29 | * Permission to use, copy, modify, distribute and sell this software |
30 | * and its documentation for any purpose is hereby granted without fee, |
31 | * provided that the above copyright notice appear in all copies and |
32 | * that both that copyright notice and this permission notice appear |
33 | * in supporting documentation. Silicon Graphics makes no |
34 | * representations about the suitability of this software for any |
35 | * purpose. It is provided "as is" without express or implied warranty. |
36 | */ |
37 | |
38 | /** @file bits/allocator.h |
39 | * This is an internal header file, included by other library headers. |
40 | * Do not attempt to use it directly. @headername{memory} |
41 | */ |
42 | |
43 | #ifndef _ALLOCATOR_H |
44 | #define _ALLOCATOR_H 1 |
45 | |
46 | #include <bits/c++allocator.h> // Define the base class to std::allocator. |
47 | #include <bits/memoryfwd.h> |
48 | #if __cplusplus >= 201103L |
49 | #include <type_traits> |
50 | #endif |
51 | |
52 | namespace std _GLIBCXX_VISIBILITY(default) |
53 | { |
54 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
55 | |
56 | /** |
57 | * @addtogroup allocators |
58 | * @{ |
59 | */ |
60 | |
61 | /// allocator<void> specialization. |
62 | template<> |
63 | class allocator<void> |
64 | { |
65 | public: |
66 | typedef size_t size_type; |
67 | typedef ptrdiff_t difference_type; |
68 | typedef void* pointer; |
69 | typedef const void* const_pointer; |
70 | typedef void value_type; |
71 | |
72 | template<typename _Tp1> |
73 | struct rebind |
74 | { typedef allocator<_Tp1> other; }; |
75 | |
76 | #if __cplusplus >= 201103L |
77 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
78 | // 2103. std::allocator propagate_on_container_move_assignment |
79 | typedef true_type propagate_on_container_move_assignment; |
80 | #endif |
81 | }; |
82 | |
83 | /** |
84 | * @brief The @a standard allocator, as per [20.4]. |
85 | * |
86 | * See http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt04ch11.html |
87 | * for further details. |
88 | * |
89 | * @tparam _Tp Type of allocated object. |
90 | */ |
91 | template<typename _Tp> |
92 | class allocator: public __allocator_base<_Tp> |
93 | { |
94 | public: |
95 | typedef size_t size_type; |
96 | typedef ptrdiff_t difference_type; |
97 | typedef _Tp* pointer; |
98 | typedef const _Tp* const_pointer; |
99 | typedef _Tp& reference; |
100 | typedef const _Tp& const_reference; |
101 | typedef _Tp value_type; |
102 | |
103 | template<typename _Tp1> |
104 | struct rebind |
105 | { typedef allocator<_Tp1> other; }; |
106 | |
107 | #if __cplusplus >= 201103L |
108 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
109 | // 2103. std::allocator propagate_on_container_move_assignment |
110 | typedef true_type propagate_on_container_move_assignment; |
111 | #endif |
112 | |
113 | allocator() throw() { } |
114 | |
115 | allocator(const allocator& __a) throw() |
116 | : __allocator_base<_Tp>(__a) { } |
117 | |
118 | template<typename _Tp1> |
119 | allocator(const allocator<_Tp1>&) throw() { } |
120 | |
121 | ~allocator() throw() { } |
122 | |
123 | // Inherit everything else. |
124 | }; |
125 | |
126 | template<typename _T1, typename _T2> |
127 | inline bool |
128 | operator==(const allocator<_T1>&, const allocator<_T2>&) |
129 | { return true; } |
130 | |
131 | template<typename _Tp> |
132 | inline bool |
133 | operator==(const allocator<_Tp>&, const allocator<_Tp>&) |
134 | { return true; } |
135 | |
136 | template<typename _T1, typename _T2> |
137 | inline bool |
138 | operator!=(const allocator<_T1>&, const allocator<_T2>&) |
139 | { return false; } |
140 | |
141 | template<typename _Tp> |
142 | inline bool |
143 | operator!=(const allocator<_Tp>&, const allocator<_Tp>&) |
144 | { return false; } |
145 | |
146 | /// @} group allocator |
147 | |
148 | // Inhibit implicit instantiations for required instantiations, |
149 | // which are defined via explicit instantiations elsewhere. |
150 | #if _GLIBCXX_EXTERN_TEMPLATE |
151 | extern template class allocator<char>; |
152 | extern template class allocator<wchar_t>; |
153 | #endif |
154 | |
155 | // Undefine. |
156 | #undef __allocator_base |
157 | |
158 | // To implement Option 3 of DR 431. |
159 | template<typename _Alloc, bool = __is_empty(_Alloc)> |
160 | struct __alloc_swap |
161 | { static void _S_do_it(_Alloc&, _Alloc&) _GLIBCXX_NOEXCEPT { } }; |
162 | |
163 | template<typename _Alloc> |
164 | struct __alloc_swap<_Alloc, false> |
165 | { |
166 | static void |
167 | _S_do_it(_Alloc& __one, _Alloc& __two) _GLIBCXX_NOEXCEPT |
168 | { |
169 | // Precondition: swappable allocators. |
170 | if (__one != __two) |
171 | swap(__one, __two); |
172 | } |
173 | }; |
174 | |
175 | // Optimize for stateless allocators. |
176 | template<typename _Alloc, bool = __is_empty(_Alloc)> |
177 | struct __alloc_neq |
178 | { |
179 | static bool |
180 | _S_do_it(const _Alloc&, const _Alloc&) |
181 | { return false; } |
182 | }; |
183 | |
184 | template<typename _Alloc> |
185 | struct __alloc_neq<_Alloc, false> |
186 | { |
187 | static bool |
188 | _S_do_it(const _Alloc& __one, const _Alloc& __two) |
189 | { return __one != __two; } |
190 | }; |
191 | |
192 | #if __cplusplus >= 201103L |
193 | template<typename _Tp, bool |
194 | = __or_<is_copy_constructible<typename _Tp::value_type>, |
195 | is_nothrow_move_constructible<typename _Tp::value_type>>::value> |
196 | struct __shrink_to_fit_aux |
197 | { static bool _S_do_it(_Tp&) noexcept { return false; } }; |
198 | |
199 | template<typename _Tp> |
200 | struct __shrink_to_fit_aux<_Tp, true> |
201 | { |
202 | static bool |
203 | _S_do_it(_Tp& __c) noexcept |
204 | { |
205 | __try |
206 | { |
207 | _Tp(__make_move_if_noexcept_iterator(__c.begin()), |
208 | __make_move_if_noexcept_iterator(__c.end()), |
209 | __c.get_allocator()).swap(__c); |
210 | return true; |
211 | } |
212 | __catch(...) |
213 | { return false; } |
214 | } |
215 | }; |
216 | #endif |
217 | |
218 | _GLIBCXX_END_NAMESPACE_VERSION |
219 | } // namespace std |
220 | |
221 | #endif |
222 | |