1 : // Allocators -*- C++ -*-
2 :
3 : // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006
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 : #include <bits/cpp_type_traits.h> // for __is_empty
56 :
57 : _GLIBCXX_BEGIN_NAMESPACE(std)
58 :
59 : template<typename _Tp>
60 : class allocator;
61 :
62 : /// allocator<void> specialization.
63 : template<>
64 : class allocator<void>
65 : {
66 : public:
67 : typedef size_t size_type;
68 : typedef ptrdiff_t difference_type;
69 : typedef void* pointer;
70 : typedef const void* const_pointer;
71 : typedef void value_type;
72 :
73 : template<typename _Tp1>
74 : struct rebind
75 : { typedef allocator<_Tp1> other; };
76 : };
77 :
78 : /**
79 : * @brief The "standard" allocator, as per [20.4].
80 : *
81 : * Further details:
82 : * http://gcc.gnu.org/onlinedocs/libstdc++/20_util/allocator.html
83 : */
84 : template<typename _Tp>
85 : class allocator: public __glibcxx_base_allocator<_Tp>
86 : {
87 : public:
88 : typedef size_t size_type;
89 : typedef ptrdiff_t difference_type;
90 : typedef _Tp* pointer;
91 : typedef const _Tp* const_pointer;
92 : typedef _Tp& reference;
93 : typedef const _Tp& const_reference;
94 : typedef _Tp value_type;
95 :
96 : template<typename _Tp1>
97 : struct rebind
98 : { typedef allocator<_Tp1> other; };
99 :
100 43406 : allocator() throw() { }
101 :
102 160987 : allocator(const allocator& __a) throw()
103 160987 : : __glibcxx_base_allocator<_Tp>(__a) { }
104 :
105 : template<typename _Tp1>
106 22466 : allocator(const allocator<_Tp1>&) throw() { }
107 :
108 226760 : ~allocator() throw() { }
109 :
110 : // Inherit everything else.
111 : };
112 :
113 : template<typename _T1, typename _T2>
114 : inline bool
115 : operator==(const allocator<_T1>&, const allocator<_T2>&)
116 : { return true; }
117 :
118 : template<typename _T1, typename _T2>
119 : inline bool
120 : operator!=(const allocator<_T1>&, const allocator<_T2>&)
121 : { return false; }
122 :
123 : // Inhibit implicit instantiations for required instantiations,
124 : // which are defined via explicit instantiations elsewhere.
125 : // NB: This syntax is a GNU extension.
126 : #if _GLIBCXX_EXTERN_TEMPLATE
127 : extern template class allocator<char>;
128 : extern template class allocator<wchar_t>;
129 : #endif
130 :
131 : // Undefine.
132 : #undef __glibcxx_base_allocator
133 :
134 : // To implement Option 3 of DR 431.
135 : template<typename _Alloc, bool = std::__is_empty<_Alloc>::__value>
136 : struct __alloc_swap
137 : { static void _S_do_it(_Alloc&, _Alloc&) { } };
138 :
139 : template<typename _Alloc>
140 : struct __alloc_swap<_Alloc, false>
141 : {
142 : static void
143 : _S_do_it(_Alloc& __one, _Alloc& __two)
144 : {
145 : // Precondition: swappable allocators.
146 : if (__one != __two)
147 : swap(__one, __two);
148 : }
149 : };
150 :
151 : _GLIBCXX_END_NAMESPACE
152 :
153 : #endif
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