| // 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 |
| |
| |