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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/tag_of.hpp
- /// \brief Safe way to acces the tag of a type
- #ifndef BOOST_BIMAP_TAGS_SUPPORT_TAG_OF_HPP
- #define BOOST_BIMAP_TAGS_SUPPORT_TAG_OF_HPP
- #if defined(_MSC_VER)
- #pragma once
- #endif
- #include <boost/config.hpp>
- #include <boost/bimap/tags/tagged.hpp>
- #include <boost/bimap/detail/debug/static_error.hpp>
- /** \struct boost::bimaps::tags::support::tag_of
- \brief Metafunction to obtain the tag of a type.
- \code
- template< class TaggedType >
- struct tag_of
- {
- typedef {Tag} type;
- };
- \endcode
- If the type is not tagged you will get a compile timer error with the following message:
- \verbatim
- USING_TAG_OF_WITH_AN_UNTAGGED_TYPE, TaggedType
- \endverbatim
- See also tagged, value_type_of.
- **/
- #ifndef BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
- namespace boost {
- namespace bimaps {
- namespace tags {
- namespace support {
- // tag_of metafunction
- template< class Type >
- struct tag_of
- {
- BOOST_BIMAP_STATIC_ERROR( USING_TAG_OF_WITH_AN_UNTAGGED_TYPE, (Type) );
- };
- template< class Type, class Tag >
- struct tag_of< tagged< Type, Tag > >
- {
- typedef Tag type;
- };
- } // namespace support
- } // namespace tags
- } // namespace bimaps
- } // namespace boost
- #endif // BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
- #endif // BOOST_BIMAP_TAGS_SUPPORT_TAG_OF_HPP
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