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// HP/SGI iterator extensions -*- C++ -*-

// Copyright (C) 2001, 2002, 2004, 2005, 2009 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 3, 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.

// Under Section 7 of GPL version 3, you are granted additional

// permissions described in the GCC Runtime Library Exception, version

// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and

// a copy of the GCC Runtime Library Exception along with this program;

// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

// .

/*

 *

 * Copyright (c) 1994

 * Hewlett-Packard Company

 *

 * 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.  Hewlett-Packard Company makes no

 * representations about the suitability of this software for any

 * purpose.  It is provided "as is" without express or implied warranty.

 *

 *

 * Copyright (c) 1996-1998

 * 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 ext/iterator

 *  This file is a GNU extension to the Standard C++ Library (possibly

 *  containing extensions from the HP/SGI STL subset).

 */

#ifndef _EXT_ITERATOR

#define _EXT_ITERATOR 1

#pragma GCC system_header

#include 

#include 

_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)

  // There are two signatures for distance.  In addition to the one

  // taking two iterators and returning a result, there is another

  // taking two iterators and a reference-to-result variable, and

  // returning nothing.  The latter seems to be an SGI extension.

  // -- pedwards

  template

    inline void

    __distance(_InputIterator __first, _InputIterator __last,

               _Distance& __n, std::input_iterator_tag)

    {

      // concept requirements

      __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)

      while (__first != __last)

        {

          ++__first;

          ++__n;

        }

    }

  template

    inline void

    __distance(_RandomAccessIterator __first, _RandomAccessIterator __last,

               _Distance& __n, std::random_access_iterator_tag)

    {

      // concept requirements

      __glibcxx_function_requires(_RandomAccessIteratorConcept<

                                  _RandomAccessIterator>)

      __n += __last - __first;

    }

  /**

   *  This is an SGI extension.

   *  @ingroup SGIextensions

   *  @doctodo

  */

  template

    inline void

    distance(_InputIterator __first, _InputIterator __last,

             _Distance& __n)

    {

      // concept requirements -- taken care of in __distance

      __distance(__first, __last, __n, std::__iterator_category(__first));

    }

_GLIBCXX_END_NAMESPACE

#endif