boost/bimap/container_adaptor/detail/comparison_adaptor.hpp

// 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/comparison_adaptor.hpp
/// \brief Comparison adaptor.
#ifndef BOOST_BIMAP_CONTAINER_ADAPTOR_DETAIL_COMPARISON_ADAPTOR_HPP
#define BOOST_BIMAP_CONTAINER_ADAPTOR_DETAIL_COMPARISON_ADAPTOR_HPP
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/config.hpp>
#include <boost/call_traits.hpp>
#include <functional>
namespace boost {
namespace bimaps {
namespace container_adaptor {
namespace detail {
/// \brief Comparison adaptor
/**
A simple comparison adaptor.
                                                                                    **/
template < class Compare, class NewType, class Converter >
struct comparison_adaptor : std::binary_function<NewType,NewType,bool>
{
    comparison_adaptor( const Compare & comp, const Converter & conv)
        : compare(comp), converter(conv) {}
    bool operator()( BOOST_DEDUCED_TYPENAME call_traits<NewType>::param_type x,
                     BOOST_DEDUCED_TYPENAME call_traits<NewType>::param_type y) const
    {
        return compare( converter(x), converter(y) );
    }
    private:
    Compare     compare;
    Converter   converter;
};
template < class Compare, class NewType, class Converter >
struct compatible_comparison_adaptor : std::binary_function<NewType,NewType,bool>
{
    compatible_comparison_adaptor( const Compare & comp, const Converter & conv)
        : compare(comp), converter(conv) {}
    template< class CompatibleTypeLeft, class CompatibleTypeRight >
    bool operator()( const CompatibleTypeLeft  & x,
                     const CompatibleTypeRight & y) const
    {
        return compare( converter(x), converter(y) );
    }
    private:
    Compare     compare;
    Converter   converter;
};
/// \brief Unary Check adaptor
/**
A simple unary check adaptor.
                                                                                    **/
template < class Compare, class NewType, class Converter >
struct unary_check_adaptor : std::unary_function<NewType,bool>
{
    unary_check_adaptor( const Compare & comp, const Converter & conv ) :
        compare(comp), converter(conv) {}
    bool operator()( BOOST_DEDUCED_TYPENAME call_traits<NewType>::param_type x) const
    {
        return compare( converter(x) );
    }
    private:
    Compare   compare;
    Converter converter;
};
} // namespace detail
} // namespace container_adaptor
} // namespace bimaps
} // namespace boost
#endif // BOOST_BIMAP_CONTAINER_ADAPTOR_DETAIL_COMPARISON_ADAPTOR_HPP