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diff --git a/boost_ext/boost/multi_index/detail/has_tag.hpp b/boost_ext/boost/multi_index/detail/has_tag.hpp
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+/* Copyright 2003-2005 Joaquín M López Muñoz.
+ * 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)
+ *
+ * See http://www.boost.org/libs/multi_index for library home page.
+ */
+
+#ifndef BOOST_MULTI_INDEX_DETAIL_HAS_TAG_HPP
+#define BOOST_MULTI_INDEX_DETAIL_HAS_TAG_HPP
+
+#if defined(_MSC_VER)&&(_MSC_VER>=1200)
+#pragma once
+#endif
+
+#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
+#include <boost/mpl/contains.hpp>
+
+namespace boost{
+
+namespace multi_index{
+
+namespace detail{
+
+/* determines whether an index type has a given tag in its tag list */
+
+template<typename Tag>
+struct has_tag
+{
+  template<typename Index>
+  struct apply:mpl::contains<BOOST_DEDUCED_TYPENAME Index::tag_list,Tag>
+  {
+  }; 
+};
+
+} /* namespace multi_index::detail */
+
+} /* namespace multi_index */
+
+} /* namespace boost */
+
+#endif