change the return type from the indexed adaptor so that the index is available from the range element.

include/boost/range/traversal.hpp

@@ -0,0 +1,31 @@
+// Boost.Range library
+//
+//  Copyright Neil Groves 2014. 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_TRAVERSAL_HPP
+#define BOOST_RANGE_TRAVERSAL_HPP
+
+#if defined(_MSC_VER)
+# pragma once
+#endif
+
+#include <boost/range/config.hpp>
+#include <boost/range/iterator.hpp>
+#include <boost/iterator/iterator_traits.hpp>
+
+namespace boost
+{
+    template<typename SinglePassRange>
+    struct range_traversal
+        : iterator_traversal<typename range_iterator<SinglePassRange>::type>
+    {
+    };
+}
+
+#endif