1 : // Allocators -*- C++ -*-
2 :
3 : // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
4 : // Free Software Foundation, Inc.
5 : //
6 : // This file is part of the GNU ISO C++ Library. This library is free
7 : // software; you can redistribute it and/or modify it under the
8 : // terms of the GNU General Public License as published by the
9 : // Free Software Foundation; either version 2, or (at your option)
10 : // any later version.
11 :
12 : // This library is distributed in the hope that it will be useful,
13 : // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 : // GNU General Public License for more details.
16 :
17 : // You should have received a copy of the GNU General Public License along
18 : // with this library; see the file COPYING. If not, write to the Free
19 : // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
20 : // USA.
21 :
22 : // As a special exception, you may use this file as part of a free software
23 : // library without restriction. Specifically, if other files instantiate
24 : // templates or use macros or inline functions from this file, or you compile
25 : // this file and link it with other files to produce an executable, this
26 : // file does not by itself cause the resulting executable to be covered by
27 : // the GNU General Public License. This exception does not however
28 : // invalidate any other reasons why the executable file might be covered by
29 : // the GNU General Public License.
30 :
31 : /*
32 : * Copyright (c) 1996-1997
33 : * Silicon Graphics Computer Systems, Inc.
34 : *
35 : * Permission to use, copy, modify, distribute and sell this software
36 : * and its documentation for any purpose is hereby granted without fee,
37 : * provided that the above copyright notice appear in all copies and
38 : * that both that copyright notice and this permission notice appear
39 : * in supporting documentation. Silicon Graphics makes no
40 : * representations about the suitability of this software for any
41 : * purpose. It is provided "as is" without express or implied warranty.
42 : */
43 :
44 : /** @file allocator.h
45 : * This is an internal header file, included by other library headers.
46 : * You should not attempt to use it directly.
47 : */
48 :
49 : #ifndef _ALLOCATOR_H
50 : #define _ALLOCATOR_H 1
51 :
52 : // Define the base class to std::allocator.
53 : #include <bits/c++allocator.h>
54 :
55 : _GLIBCXX_BEGIN_NAMESPACE(std)
56 :
57 : template<typename _Tp>
58 : class allocator;
59 :
60 : /// allocator<void> specialization.
61 : template<>
62 : class allocator<void>
63 : {
64 : public:
65 : typedef size_t size_type;
66 : typedef ptrdiff_t difference_type;
67 : typedef void* pointer;
68 : typedef const void* const_pointer;
69 : typedef void value_type;
70 :
71 : template<typename _Tp1>
72 : struct rebind
73 : { typedef allocator<_Tp1> other; };
74 : };
75 :
76 : /**
77 : * @brief The "standard" allocator, as per [20.4].
78 : *
79 : * Further details:
80 : * http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt04ch11.html
81 : */
82 : template<typename _Tp>
83 : class allocator: public __glibcxx_base_allocator<_Tp>
84 : {
85 : public:
86 : typedef size_t size_type;
87 : typedef ptrdiff_t difference_type;
88 : typedef _Tp* pointer;
89 : typedef const _Tp* const_pointer;
90 : typedef _Tp& reference;
91 : typedef const _Tp& const_reference;
92 : typedef _Tp value_type;
93 :
94 : template<typename _Tp1>
95 : struct rebind
96 : { typedef allocator<_Tp1> other; };
97 :
98 285441 : allocator() throw() { }
99 :
100 934618 : allocator(const allocator& __a) throw()
101 934618 : : __glibcxx_base_allocator<_Tp>(__a) { }
102 :
103 : template<typename _Tp1>
104 11289504 : allocator(const allocator<_Tp1>&) throw() { }
105 :
106 12615289 : ~allocator() throw() { }
107 :
108 : // Inherit everything else.
109 : };
110 :
111 : template<typename _T1, typename _T2>
112 : inline bool
113 : operator==(const allocator<_T1>&, const allocator<_T2>&)
114 : { return true; }
115 :
116 : template<typename _Tp>
117 : inline bool
118 0 : operator==(const allocator<_Tp>&, const allocator<_Tp>&)
119 0 : { return true; }
120 :
121 : template<typename _T1, typename _T2>
122 : inline bool
123 : operator!=(const allocator<_T1>&, const allocator<_T2>&)
124 : { return false; }
125 :
126 : template<typename _Tp>
127 : inline bool
128 : operator!=(const allocator<_Tp>&, const allocator<_Tp>&)
129 : { return false; }
130 :
131 : // Inhibit implicit instantiations for required instantiations,
132 : // which are defined via explicit instantiations elsewhere.
133 : // NB: This syntax is a GNU extension.
134 : #if _GLIBCXX_EXTERN_TEMPLATE
135 : extern template class allocator<char>;
136 : extern template class allocator<wchar_t>;
137 : #endif
138 :
139 : // Undefine.
140 : #undef __glibcxx_base_allocator
141 :
142 : // To implement Option 3 of DR 431.
143 : template<typename _Alloc, bool = __is_empty(_Alloc)>
144 : struct __alloc_swap
145 : { static void _S_do_it(_Alloc&, _Alloc&) { } };
146 :
147 : template<typename _Alloc>
148 : struct __alloc_swap<_Alloc, false>
149 : {
150 : static void
151 : _S_do_it(_Alloc& __one, _Alloc& __two)
152 : {
153 : // Precondition: swappable allocators.
154 : if (__one != __two)
155 : swap(__one, __two);
156 : }
157 : };
158 :
159 : // Optimize for stateless allocators.
160 : template<typename _Alloc, bool = __is_empty(_Alloc)>
161 : struct __alloc_neq
162 : {
163 : static bool
164 : _S_do_it(const _Alloc&, const _Alloc&)
165 : { return false; }
166 : };
167 :
168 : template<typename _Alloc>
169 : struct __alloc_neq<_Alloc, false>
170 : {
171 : static bool
172 : _S_do_it(const _Alloc& __one, const _Alloc& __two)
173 : { return __one != __two; }
174 : };
175 :
176 : _GLIBCXX_END_NAMESPACE
177 :
178 : #endif
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