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authorAnas Nashif <anas.nashif@intel.com>2012-10-30 19:57:26 (GMT)
committerAnas Nashif <anas.nashif@intel.com>2012-10-30 19:57:26 (GMT)
commit1a78a62555be32868418fe52f8e330c9d0f95d5a (patch)
treed3765a80e7d3b9640ec2e930743630cd6b9fce2b /boost/bimap/tags/support/default_tagged.hpp
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Imported Upstream version 1.49.0upstream/1.49.0
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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/default_tagged.hpp
+/// \brief Weak tagging
+
+#ifndef BOOST_BIMAP_TAGS_SUPPORT_DEFAULT_TAGGED_HPP
+#define BOOST_BIMAP_TAGS_SUPPORT_DEFAULT_TAGGED_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER>=1200)
+#pragma once
+#endif
+
+#include <boost/config.hpp>
+
+#include <boost/bimap/tags/tagged.hpp>
+
+/** \struct boost::bimaps::tags::support::default_tagged
+\brief Weak tagging metafunction
+
+\code
+template< class Type, class Tag >
+struct default_tagged
+{
+ typedef {TaggedType} type;
+};
+\endcode
+
+If the type is not tagged, this metafunction returns a tagged type with the
+default tag. If it is tagged, the returns the type unchanged.
+
+See also tagged, overwrite_tagged.
+ **/
+
+#ifndef BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
+
+namespace boost {
+namespace bimaps {
+namespace tags {
+namespace support {
+
+
+// Default Tagging
+// A metafunction that create a tagged type with a default tag value.
+
+template< class Type, class DefaultTag >
+struct default_tagged
+{
+ typedef tagged<Type,DefaultTag> type;
+};
+
+template< class Type, class OldTag, class NewTag >
+struct default_tagged< tagged< Type, OldTag >, NewTag >
+{
+ typedef tagged<Type,OldTag> type;
+};
+
+} // namespace support
+} // namespace tags
+} // namespace bimaps
+} // namespace boost
+
+#endif // BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
+
+#endif // BOOST_BIMAP_TAGS_SUPPORT_DEFAULT_TAGGED_HPP
+
+
+