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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 relation/support/value_type_of.hpp
- /// \brief value_type_of<tag,relation> metafunction
- #ifndef BOOST_BIMAP_RELATION_SUPPORT_VALUE_TYPE_OF_HPP
- #define BOOST_BIMAP_RELATION_SUPPORT_VALUE_TYPE_OF_HPP
- #if defined(_MSC_VER)
- #pragma once
- #endif
- #include <boost/config.hpp>
- #include <boost/bimap/relation/detail/metadata_access_builder.hpp>
- /** \struct boost::bimaps::relation::support::value_type_of
- \brief Metafunction to obtain the value type of one of the sides.
- \code
- template< class Tag, class Relation >
- struct value_type_of
- {
- typedef typename Relation::{side}_type type;
- };
- \endcode
- See also member_at, get().
- \ingroup relation_group
- **/
- namespace boost {
- namespace bimaps {
- namespace relation {
- namespace support {
- // Metafunction value_type_of
- /*
- template< class Tag, class Relation >
- struct value_type_of
- {
- typedef -unspecified- type;
- };
- */
- BOOST_BIMAP_SYMMETRIC_METADATA_ACCESS_BUILDER
- (
- value_type_of,
- left_value_type,
- right_value_type
- )
- // Add support for info tags to value_type_of
- template< class Tag, class SymmetricType >
- struct value_type_of
- <
- Tag, SymmetricType,
- BOOST_DEDUCED_TYPENAME enable_if
- <
- ::boost::bimaps::relation::support::is_tag_of_member_at_info
- <
- Tag,
- SymmetricType
- >
- >::type
- >
- {
- typedef BOOST_DEDUCED_TYPENAME SymmetricType::info_type type;
- };
- } // namespace support
- } // namespace relation
- } // namespace bimaps
- } // namespace boost
- #endif // BOOST_BIMAP_RELATION_SUPPORT_VALUE_TYPE_OF_HPP
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