--- /dev/null
+/*=============================================================================
+ Copyright (c) 2009 Christopher Schmidt
+
+ 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)
+==============================================================================*/
+
+#ifndef BOOST_FUSION_VIEW_JOINT_VIEW_DETAIL_KEY_OF_IMPL_HPP
+#define BOOST_FUSION_VIEW_JOINT_VIEW_DETAIL_KEY_OF_IMPL_HPP
+
+#include <boost/fusion/iterator/key_of.hpp>
+
+namespace boost { namespace fusion { namespace extension
+{
+ template <typename>
+ struct key_of_impl;
+
+ template <>
+ struct key_of_impl<joint_view_iterator_tag>
+ {
+ template <typename It>
+ struct apply
+ : result_of::key_of<typename It::first_type>
+ {};
+ };
+}}}
+
+#endif