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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)
- #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
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