| // 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) && (_MSC_VER>=1200) | |
| #pragma once | |
| #endif | |
| #include <boost/config.hpp> | |
| #include <functional> | |
| namespace boost { | |
| namespace bimaps { | |
| namespace container_adaptor { | |
| namespace detail { | |
| /// \brief Key Extractor | |
| template < class T > | |
| struct key_from_pair_extractor | |
| : std::unary_function< T, BOOST_DEDUCED_TYPENAME T::first_type > | |
| { | |
| bool 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 | |