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// Allocators -*- C++ -*-
 
// Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.
 
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
 
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING.  If not, write to the Free
// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// USA.
 
// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
 
/*
 * Copyright (c) 1996-1997
 * Silicon Graphics Computer Systems, Inc.
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Silicon Graphics makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 */
 
/** @file allocator.h
 *  This is an internal header file, included by other library headers.
 *  You should not attempt to use it directly.
 */
 
#ifndef _ALLOCATOR_H
#define _ALLOCATOR_H 1
 
// Define the base class to std::allocator.
#include <bits/c++allocator.h>
 
namespace std
{
  template<typename _Tp>
    class allocator;
 
  /// allocator<void> specialization.
  template<>
    class allocator<void>
    {
    public:
      typedef size_t      size_type;
      typedef ptrdiff_t   difference_type;
      typedef void*       pointer;
      typedef const void* const_pointer;
      typedef void        value_type;
 
      template<typename _Tp1>
        struct rebind
        { typedef allocator<_Tp1> other; };
    };
 
  /**
   * @brief  The "standard" allocator, as per [20.4].
   *
   *  Further details:
   *  http://gcc.gnu.org/onlinedocs/libstdc++/20_util/allocator.html
   */
  template<typename _Tp>
    class allocator: public __glibcxx_base_allocator<_Tp>
    {
   public:
      typedef size_t     size_type;
      typedef ptrdiff_t  difference_type;
      typedef _Tp*       pointer;
      typedef const _Tp* const_pointer;
      typedef _Tp&       reference;
      typedef const _Tp& const_reference;
      typedef _Tp        value_type;
 
      template<typename _Tp1>
        struct rebind
        { typedef allocator<_Tp1> other; };
 
      allocator() throw() { }
 
      allocator(const allocator& __a) throw()
      : __glibcxx_base_allocator<_Tp>(__a) { }
 
      template<typename _Tp1>
        allocator(const allocator<_Tp1>&) throw() { }
 
      ~allocator() throw() { }
 
      // Inherit everything else.
    };
 
  template<typename _T1, typename _T2>
    inline bool
    operator==(const allocator<_T1>&, const allocator<_T2>&)
    { return true; }
 
  template<typename _T1, typename _T2>
    inline bool
    operator!=(const allocator<_T1>&, const allocator<_T2>&)
    { return false; }
 
  // Inhibit implicit instantiations for required instantiations,
  // which are defined via explicit instantiations elsewhere.
  // NB: This syntax is a GNU extension.
#if _GLIBCXX_EXTERN_TEMPLATE
  extern template class allocator<char>;
  extern template class allocator<wchar_t>;
#endif
 
  // Undefine.
#undef __glibcxx_base_allocator
} // namespace std
 
#endif