| // 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) && (_MSC_VER>=1200) |
| #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 |
| |