// Boost.Bimap
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//
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// Copyright (c) 2006-2007 Matias Capeletto
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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/// \file relation/support/value_type_of.hpp
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/// \brief value_type_of<tag,relation> metafunction
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#ifndef BOOST_BIMAP_RELATION_SUPPORT_VALUE_TYPE_OF_HPP
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#define BOOST_BIMAP_RELATION_SUPPORT_VALUE_TYPE_OF_HPP
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <boost/config.hpp>
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#include <boost/bimap/relation/detail/metadata_access_builder.hpp>
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/** \struct boost::bimaps::relation::support::value_type_of
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\brief Metafunction to obtain the value type of one of the sides.
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\code
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template< class Tag, class Relation >
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struct value_type_of
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{
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typedef typename Relation::{side}_type type;
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};
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\endcode
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See also member_at, get().
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\ingroup relation_group
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**/
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namespace boost {
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namespace bimaps {
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namespace relation {
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namespace support {
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// Metafunction value_type_of
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/*
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template< class Tag, class Relation >
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struct value_type_of
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{
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typedef -unspecified- type;
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};
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*/
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BOOST_BIMAP_SYMMETRIC_METADATA_ACCESS_BUILDER
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(
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value_type_of,
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left_value_type,
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right_value_type
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)
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// Add support for info tags to value_type_of
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template< class Tag, class SymmetricType >
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struct value_type_of
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<
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Tag, SymmetricType,
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BOOST_DEDUCED_TYPENAME enable_if
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<
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::boost::bimaps::relation::support::is_tag_of_member_at_info
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<
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Tag,
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SymmetricType
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>
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>::type
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>
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{
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typedef BOOST_DEDUCED_TYPENAME SymmetricType::info_type type;
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};
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} // namespace support
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} // namespace relation
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} // namespace bimaps
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} // namespace boost
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#endif // BOOST_BIMAP_RELATION_SUPPORT_VALUE_TYPE_OF_HPP
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