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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 support/data_type_by.hpp
- /// \brief Metafunction to access the data types of a bimap
- #ifndef BOOST_BIMAP_SUPPORT_DATA_TYPE_BY_HPP
- #define BOOST_BIMAP_SUPPORT_DATA_TYPE_BY_HPP
- #if defined(_MSC_VER)
- #pragma once
- #endif
- #include <boost/config.hpp>
- #include <boost/bimap/relation/detail/metadata_access_builder.hpp>
- /** \struct boost::bimaps::support::data_type_by
- \brief Metafunction to obtain the data type of one of the sides in a bimap
- The tag parameter can be either a user defined tag or \c member_at::{side}.
- This is the actual data type stored in the bimap.
- \code
- template< class Tag, class Bimap >
- struct data_type_by
- {
- typedef typename Bimap::{side}_data_type type;
- };
- \endcode
- The following holds:
- \code
- BOOST_STATIC_ASSERT
- (
- is_same< data_type_by< member_at::left, bimap<A,B> >::type, A >::value
- )
- \endcode
- See also member_at.
- \ingroup bimap_group
- **/
- namespace boost {
- namespace bimaps {
- namespace support {
- // Implementation of data type of metafunction
- BOOST_BIMAP_SYMMETRIC_METADATA_ACCESS_BUILDER
- (
- data_type_by,
- left_data_type,
- right_data_type
- )
- } // namespace support
- } // namespace bimaps
- } // namespace boost
- #endif // BOOST_BIMAP_SUPPORT_DATA_TYPE_BY_HPP
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