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diff --git a/i686-linux-gnu-4.7/usr/include/c++/4.7/ext/iterator b/i686-linux-gnu-4.7/usr/include/c++/4.7/ext/iterator
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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
+