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diff --git a/boost/fusion/view/iterator_range/detail/size_impl.hpp b/boost/fusion/view/iterator_range/detail/size_impl.hpp
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+++ b/boost/fusion/view/iterator_range/detail/size_impl.hpp
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+/*=============================================================================
+    Copyright (c) 2011 Eric Niebler
+
+    Distributed under 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)
+==============================================================================*/
+
+#if !defined(BOOST_FUSION_ITERATOR_RANGE_SIZE_IMPL_HPP_INCLUDED)
+#define BOOST_FUSION_ITERATOR_RANGE_SIZE_IMPL_HPP_INCLUDED
+
+#include <boost/fusion/iterator/distance.hpp>
+
+namespace boost { namespace fusion
+{
+    struct iterator_range_tag;
+
+    namespace extension
+    {
+        template <typename Tag>
+        struct size_impl;
+
+        template <>
+        struct size_impl<iterator_range_tag>
+        {
+            template <typename Seq>
+            struct apply
+              : result_of::distance<
+                    typename Seq::begin_type,
+                    typename Seq::end_type
+                >
+            {};
+        };
+    }
+}}
+
+#endif
+