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