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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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