// 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 container_adaptor/detail/key_extractor.hpp
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/// \brief Key extractor for a pair<Key,Data>.
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#ifndef BOOST_BIMAP_CONTAINER_ADAPTOR_DETAIL_KEY_EXTRACTOR_HPP
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#define BOOST_BIMAP_CONTAINER_ADAPTOR_DETAIL_KEY_EXTRACTOR_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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namespace boost {
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namespace bimaps {
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namespace container_adaptor {
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namespace detail {
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/// \brief Key Extractor
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template < class T >
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struct key_from_pair_extractor
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{
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typedef T argument_type;
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typedef BOOST_DEDUCED_TYPENAME T::first_type result_type;
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result_type operator()( const T & p ) { return p.first; }
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};
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} // namespace detail
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} // namespace container_adaptor
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} // namespace bimaps
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} // namespace boost
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#endif // BOOST_BIMAP_CONTAINER_ADAPTOR_DETAIL_KEY_EXTRACTOR_HPP
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