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diff --git a/boost/fusion/adapted/std_tuple/mpl/clear.hpp b/boost/fusion/adapted/std_tuple/mpl/clear.hpp
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+/*=============================================================================
+ Copyright (c) 2012 Kohei Takahashi
+
+ 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_CLEAR_10172012_0940)
+#define BOOST_FUSION_CLEAR_10172012_0940
+
+#include <boost/mpl/identity.hpp>
+#include <boost/fusion/adapted/std_tuple/tag_of.hpp>
+
+namespace boost { namespace fusion { namespace detail
+{
+ template <typename Tag>
+ struct clear;
+
+ template <>
+ struct clear<std_tuple_tag> : mpl::identity<std::tuple<> > {};
+
+}}}
+
+#endif