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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