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diff --git a/boost/range/size_type.hpp b/boost/range/size_type.hpp
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+++ b/boost/range/size_type.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_SIZE_TYPE_HPP
+#define BOOST_RANGE_SIZE_TYPE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include <boost/range/config.hpp>
+#include <boost/range/difference_type.hpp>
+#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+#include <boost/range/detail/size_type.hpp>
+#else
+
+#include <boost/utility/enable_if.hpp>
+#include <boost/type_traits/make_unsigned.hpp>
+#include <boost/type_traits/remove_const.hpp>
+#include <cstddef>
+#include <utility>
+
+namespace boost
+{
+    namespace detail
+    {
+
+        //////////////////////////////////////////////////////////////////////////
+        // default
+        //////////////////////////////////////////////////////////////////////////
+
+        template<typename T>
+        class has_size_type
+        {
+            typedef char no_type;
+            struct yes_type { char dummy[2]; };
+
+            template<typename C>
+            static yes_type test(BOOST_DEDUCED_TYPENAME C::size_type x);
+
+            template<typename C, typename Arg>
+            static no_type test(Arg x);
+
+        public:
+            static const bool value = sizeof(test<T>(0)) == sizeof(yes_type);
+        };
+
+        template<typename C, typename Enabler=void>
+        struct range_size
+        {
+            typedef BOOST_DEDUCED_TYPENAME make_unsigned<
+                BOOST_DEDUCED_TYPENAME range_difference<C>::type
+            >::type type;
+        };
+
+        template<typename C>
+        struct range_size<
+            C,
+            BOOST_DEDUCED_TYPENAME enable_if<has_size_type<C>, void>::type
+        >
+        {
+            typedef BOOST_DEDUCED_TYPENAME C::size_type type;
+        };
+
+    }
+
+    template< class T >
+    struct range_size :
+        detail::range_size<T>
+    { };
+
+    template< class T >
+    struct range_size<const T >
+        : detail::range_size<T>
+    { };
+
+} // namespace boost
+
+#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+
+
+#endif