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1 // Allocators -*- C++ -*-
3 // Copyright (C) 2001, 2002, 2003, 2004 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 2, or (at your option)
9 // any later version.
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.
16 // You should have received a copy of the GNU General Public License along
17 // with this library; see the file COPYING. If not, write to the Free
18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
19 // USA.
21 // As a special exception, you may use this file as part of a free software
22 // library without restriction. Specifically, if other files instantiate
23 // templates or use macros or inline functions from this file, or you compile
24 // this file and link it with other files to produce an executable, this
25 // file does not by itself cause the resulting executable to be covered by
26 // the GNU General Public License. This exception does not however
27 // invalidate any other reasons why the executable file might be covered by
28 // the GNU General Public License.
31 * Copyright (c) 1996-1997
32 * Silicon Graphics Computer Systems, Inc.
34 * Permission to use, copy, modify, distribute and sell this software
35 * and its documentation for any purpose is hereby granted without fee,
36 * provided that the above copyright notice appear in all copies and
37 * that both that copyright notice and this permission notice appear
38 * in supporting documentation. Silicon Graphics makes no
39 * representations about the suitability of this software for any
40 * purpose. It is provided "as is" without express or implied warranty.
43 /** @file allocator.h
44 * This is an internal header file, included by other library headers.
45 * You should not attempt to use it directly.
48 #ifndef _ALLOCATOR_H
49 #define _ALLOCATOR_H 1
51 // Define the base class to std::allocator.
52 #include <bits/c++allocator.h>
54 namespace std
56 template<typename _Tp>
57 class allocator;
59 template<>
60 class allocator<void>
62 public:
63 typedef size_t size_type;
64 typedef ptrdiff_t difference_type;
65 typedef void* pointer;
66 typedef const void* const_pointer;
67 typedef void value_type;
69 template<typename _Tp1>
70 struct rebind
71 { typedef allocator<_Tp1> other; };
74 /**
75 * @brief The "standard" allocator, as per [20.4].
77 * (See @link Allocators allocators info @endlink for more.)
79 template<typename _Tp>
80 class allocator: public ___glibcxx_base_allocator<_Tp>
82 public:
83 typedef size_t size_type;
84 typedef ptrdiff_t difference_type;
85 typedef _Tp* pointer;
86 typedef const _Tp* const_pointer;
87 typedef _Tp& reference;
88 typedef const _Tp& const_reference;
89 typedef _Tp value_type;
91 template<typename _Tp1>
92 struct rebind
93 { typedef allocator<_Tp1> other; };
95 allocator() throw() { }
97 allocator(const allocator& a) throw()
98 : ___glibcxx_base_allocator<_Tp>(a) { }
100 template<typename _Tp1>
101 allocator(const allocator<_Tp1>&) throw() { }
103 ~allocator() throw() { }
105 // Inherit everything else.
108 template<typename _T1, typename _T2>
109 inline bool
110 operator==(const allocator<_T1>&, const allocator<_T2>&)
111 { return true; }
113 template<typename _T1, typename _T2>
114 inline bool
115 operator!=(const allocator<_T1>&, const allocator<_T2>&)
116 { return false; }
118 // Inhibit implicit instantiations for required instantiations,
119 // which are defined via explicit instantiations elsewhere.
120 // NB: This syntax is a GNU extension.
121 #if _GLIBCXX_EXTERN_TEMPLATE
122 extern template class allocator<char>;
123 extern template class allocator<wchar_t>;
124 #endif
126 // Undefine.
127 #undef ___glibcxx_base_allocator
128 } // namespace std
130 #endif