Line data Source code
1 : // Allocators -*- C++ -*-
2 :
3 : // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
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 3, 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 : // Under Section 7 of GPL version 3, you are granted additional
18 : // permissions described in the GCC Runtime Library Exception, version
19 : // 3.1, as published by the Free Software Foundation.
20 :
21 : // You should have received a copy of the GNU General Public License and
22 : // a copy of the GCC Runtime Library Exception along with this program;
23 : // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
24 : // <http://www.gnu.org/licenses/>.
25 :
26 : /*
27 : * Copyright (c) 1996-1997
28 : * Silicon Graphics Computer Systems, Inc.
29 : *
30 : * Permission to use, copy, modify, distribute and sell this software
31 : * and its documentation for any purpose is hereby granted without fee,
32 : * provided that the above copyright notice appear in all copies and
33 : * that both that copyright notice and this permission notice appear
34 : * in supporting documentation. Silicon Graphics makes no
35 : * representations about the suitability of this software for any
36 : * purpose. It is provided "as is" without express or implied warranty.
37 : */
38 :
39 : /** @file allocator.h
40 : * This is an internal header file, included by other library headers.
41 : * You should not attempt to use it directly.
42 : */
43 :
44 : #ifndef _ALLOCATOR_H
45 : #define _ALLOCATOR_H 1
46 :
47 : // Define the base class to std::allocator.
48 : #include <bits/c++allocator.h>
49 :
50 : _GLIBCXX_BEGIN_NAMESPACE(std)
51 :
52 : /**
53 : * @defgroup allocators Allocators
54 : * @ingroup memory
55 : *
56 : * Classes encapsulating memory operations.
57 : */
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 : * @ingroup allocators
81 : *
82 : * Further details:
83 : * http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt04ch11.html
84 : */
85 : template<typename _Tp>
86 : class allocator: public __glibcxx_base_allocator<_Tp>
87 : {
88 : public:
89 : typedef size_t size_type;
90 : typedef ptrdiff_t difference_type;
91 : typedef _Tp* pointer;
92 : typedef const _Tp* const_pointer;
93 : typedef _Tp& reference;
94 : typedef const _Tp& const_reference;
95 : typedef _Tp value_type;
96 :
97 : template<typename _Tp1>
98 : struct rebind
99 : { typedef allocator<_Tp1> other; };
100 :
101 1538656 : allocator() throw() { }
102 :
103 99621 : allocator(const allocator& __a) throw()
104 199242 : : __glibcxx_base_allocator<_Tp>(__a) { }
105 :
106 : template<typename _Tp1>
107 2906140 : allocator(const allocator<_Tp1>&) throw() { }
108 :
109 4317429 : ~allocator() throw() { }
110 :
111 : // Inherit everything else.
112 : };
113 :
114 : template<typename _T1, typename _T2>
115 : inline bool
116 : operator==(const allocator<_T1>&, const allocator<_T2>&)
117 : { return true; }
118 :
119 : template<typename _Tp>
120 : inline bool
121 : operator==(const allocator<_Tp>&, const allocator<_Tp>&)
122 : { return true; }
123 :
124 : template<typename _T1, typename _T2>
125 : inline bool
126 : operator!=(const allocator<_T1>&, const allocator<_T2>&)
127 : { return false; }
128 :
129 : template<typename _Tp>
130 : inline bool
131 : operator!=(const allocator<_Tp>&, const allocator<_Tp>&)
132 : { return false; }
133 :
134 : // Inhibit implicit instantiations for required instantiations,
135 : // which are defined via explicit instantiations elsewhere.
136 : // NB: This syntax is a GNU extension.
137 : #if _GLIBCXX_EXTERN_TEMPLATE
138 : extern template class allocator<char>;
139 : extern template class allocator<wchar_t>;
140 : #endif
141 :
142 : // Undefine.
143 : #undef __glibcxx_base_allocator
144 :
145 : // To implement Option 3 of DR 431.
146 : template<typename _Alloc, bool = __is_empty(_Alloc)>
147 : struct __alloc_swap
148 0 : { static void _S_do_it(_Alloc&, _Alloc&) { } };
149 :
150 : template<typename _Alloc>
151 : struct __alloc_swap<_Alloc, false>
152 : {
153 : static void
154 : _S_do_it(_Alloc& __one, _Alloc& __two)
155 : {
156 : // Precondition: swappable allocators.
157 : if (__one != __two)
158 : swap(__one, __two);
159 : }
160 : };
161 :
162 : // Optimize for stateless allocators.
163 : template<typename _Alloc, bool = __is_empty(_Alloc)>
164 : struct __alloc_neq
165 : {
166 : static bool
167 0 : _S_do_it(const _Alloc&, const _Alloc&)
168 0 : { return false; }
169 : };
170 :
171 : template<typename _Alloc>
172 : struct __alloc_neq<_Alloc, false>
173 : {
174 : static bool
175 : _S_do_it(const _Alloc& __one, const _Alloc& __two)
176 : { return __one != __two; }
177 : };
178 :
179 : _GLIBCXX_END_NAMESPACE
180 :
181 : #endif
|
