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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
+// <http://www.gnu.org/licenses/>.
+
+/*
+ *
+ * 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 <bits/concept_check.h>
+#include <iterator>
+
+namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ // 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<typename _InputIterator, typename _Distance>
+ 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<typename _RandomAccessIterator, typename _Distance>
+ 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<typename _InputIterator, typename _Distance>
+ 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_VERSION
+} // namespace
+
+#endif
+