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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