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diff --git a/ext/boost/range/const_iterator.hpp b/ext/boost/range/const_iterator.hpp
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+++ b/ext/boost/range/const_iterator.hpp
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+// Boost.Range library
+//
+//  Copyright Thorsten Ottosen 2003-2004. Use, modification and
+//  distribution is subject to the Boost Software License, Version
+//  1.0. (See accompanying file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt)
+//
+// For more information, see http://www.boost.org/libs/range/
+//
+
+#ifndef BOOST_RANGE_CONST_ITERATOR_HPP
+#define BOOST_RANGE_CONST_ITERATOR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif
+
+#include <boost/range/config.hpp>
+
+#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+#include <boost/range/detail/const_iterator.hpp>
+#else
+
+#include <boost/type_traits/remove_const.hpp>
+#include <cstddef>
+#include <utility>
+
+namespace boost
+{
+    //////////////////////////////////////////////////////////////////////////
+    // default
+    //////////////////////////////////////////////////////////////////////////
+    
+    template< typename C >
+    struct range_const_iterator
+    {
+        typedef BOOST_DEDUCED_TYPENAME C::const_iterator type;
+    };
+    
+    //////////////////////////////////////////////////////////////////////////
+    // pair
+    //////////////////////////////////////////////////////////////////////////
+
+    template< typename Iterator >
+    struct range_const_iterator< std::pair<Iterator,Iterator> >
+    {
+        typedef Iterator type;
+    };
+    
+    //////////////////////////////////////////////////////////////////////////
+    // array
+    //////////////////////////////////////////////////////////////////////////
+
+    template< typename T, std::size_t sz >
+    struct range_const_iterator< T[sz] >
+    {
+        typedef const T* type;
+    };
+
+} // namespace boost
+
+#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+
+#endif