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Diffstat (limited to 'boost/bimap/container_adaptor/detail/key_extractor.hpp')
-rw-r--r-- | boost/bimap/container_adaptor/detail/key_extractor.hpp | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/boost/bimap/container_adaptor/detail/key_extractor.hpp b/boost/bimap/container_adaptor/detail/key_extractor.hpp new file mode 100644 index 0000000000..3835b7c43e --- /dev/null +++ b/boost/bimap/container_adaptor/detail/key_extractor.hpp @@ -0,0 +1,45 @@ +// 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 + + |