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-rw-r--r--boost/bimap/tags/support/is_tagged.hpp64
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diff --git a/boost/bimap/tags/support/is_tagged.hpp b/boost/bimap/tags/support/is_tagged.hpp
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+// Boost.Bimap
+//
+// Copyright (c) 2006-2007 Matias Capeletto
+//
+// 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)
+
+/// \file tags/support/is_tagged.hpp
+/// \brief type_traits extension
+
+#ifndef BOOST_BIMAP_TAGS_SUPPORT_IS_TAGGED_HPP
+#define BOOST_BIMAP_TAGS_SUPPORT_IS_TAGGED_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER>=1200)
+#pragma once
+#endif
+
+#include <boost/config.hpp>
+
+#include <boost/mpl/bool.hpp>
+#include <boost/bimap/tags/tagged.hpp>
+
+/** \struct boost::bimaps::tags::support::is_tagged
+\brief Type trait to check if a type is tagged.
+
+\code
+template< class Type >
+struct is_tagged
+{
+ typedef {mpl::true_/mpl::false_} type;
+};
+\endcode
+
+See also tagged.
+ **/
+
+#ifndef BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
+
+namespace boost {
+namespace bimaps {
+namespace tags {
+namespace support {
+
+
+// is_tagged metafunction
+
+template< class Type >
+struct is_tagged :
+ ::boost::mpl::false_ {};
+
+template< class Type, class Tag >
+struct is_tagged< tagged< Type, Tag > > :
+ ::boost::mpl::true_ {};
+
+} // namespace support
+} // namespace tags
+} // namespace bimaps
+} // namespace boost
+
+#endif // BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
+
+#endif // BOOST_BIMAP_TAGS_SUPPORT_IS_TAGGED_HPP
+