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diff --git a/boost/accumulators/framework/accumulator_concept.hpp b/boost/accumulators/framework/accumulator_concept.hpp
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+///////////////////////////////////////////////////////////////////////////////
+// accumulator_concept.hpp
+//
+//  Copyright 2005 Eric Niebler. 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_ACCUMULATORS_FRAMEWORK_ACCUMULATOR_CONCEPT_HPP_EAN_28_10_2005
+#define BOOST_ACCUMULATORS_FRAMEWORK_ACCUMULATOR_CONCEPT_HPP_EAN_28_10_2005
+
+#include <boost/concept_check.hpp>
+
+namespace boost { namespace accumulators
+{
+
+template<typename Stat>
+struct accumulator_concept
+{
+    void constraints()
+    {
+        // TODO: define the stat concept
+    }
+
+    Stat stat;
+};
+
+}} // namespace boost::accumulators
+
+#endif