libstdc++-v3/include/bits/allocator.h

   1 // Allocators -*- C++ -*-
   2
   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.
  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 // 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.
  20
  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.
  29
  30 /*
  31  * Copyright (c) 1996-1997
  32  * Silicon Graphics Computer Systems, Inc.
  33  *
  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.
  41  */
  42
  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.
  46  */
  47
  48 #ifndef _ALLOCATOR_H
  49 #define _ALLOCATOR_H 1
  50
  51 // Define the base class to std::allocator.
  52 #include <bits/c++allocator.h>
  53
  54 namespace std
  55 {
  56   template<typename _Tp>
  57     class allocator;
  58
  59   template<>
  60     class allocator<void>
  61     {
  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;
  68
  69       template<typename _Tp1>
  70         struct rebind
  71         { typedef allocator<_Tp1> other; };
  72     };
  73
  74   /// @brief  The "standard" allocator, as per [20.4].
  75   template<typename _Tp>
  76     class allocator: public ___glibcxx_base_allocator<_Tp>
  77     {
  78    public:
  79       typedef size_t     size_type;
  80       typedef ptrdiff_t  difference_type;
  81       typedef _Tp*       pointer;
  82       typedef const _Tp* const_pointer;
  83       typedef _Tp&       reference;
  84       typedef const _Tp& const_reference;
  85       typedef _Tp        value_type;
  86
  87       template<typename _Tp1>
  88         struct rebind
  89         { typedef allocator<_Tp1> other; };
  90
  91       allocator() throw() { }
  92
  93       allocator(const allocator& __a) throw()
  94       : ___glibcxx_base_allocator<_Tp>(__a) { }
  95
  96       template<typename _Tp1>
  97         allocator(const allocator<_Tp1>&) throw() { }
  98
  99       ~allocator() throw() { }
 100
 101       // Inherit everything else.
 102     };
 103
 104   template<typename _T1, typename _T2>
 105     inline bool
 106     operator==(const allocator<_T1>&, const allocator<_T2>&)
 107     { return true; }
 108
 109   template<typename _T1, typename _T2>
 110     inline bool
 111     operator!=(const allocator<_T1>&, const allocator<_T2>&)
 112     { return false; }
 113
 114   // Inhibit implicit instantiations for required instantiations,
 115   // which are defined via explicit instantiations elsewhere.
 116   // NB: This syntax is a GNU extension.
 117 #if _GLIBCXX_EXTERN_TEMPLATE
 118   extern template class allocator<char>;
 119   extern template class allocator<wchar_t>;
 120 #endif
 121
 122   // Undefine.
 123 #undef ___glibcxx_base_allocator
 124 } // namespace std
 125
 126 #endif