ticket 7294 iterator_range hash_value support.

include/boost/range/iterator_range_hash.hpp

@@ -0,0 +1,22 @@
+// 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/
+//
+#include <boost/range/iterator_range_core.hpp>
+#include <boost/functional/hash.hpp>
+
+namespace boost
+{
+
+template<class T>
+std::size_t hash_value(const iterator_range<T>& rng)
+{
+    return boost::hash_range(rng.begin(), rng.end());
+}
+
+} // namespace boost