+/*==============================================================================
+ Copyright (c) 2005-2010 Joel de Guzman
+ Copyright (c) 2010 Thomas Heller
+ 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)
+==============================================================================*/
+
+#include <utility> // for std::forward used by boost/range in some cases.
#include <boost/range.hpp>
#include <boost/range/irange.hpp>
#include <boost/range/adaptors.hpp>