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