boost/bimap/views/map_view.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 views/map_view.hpp
/// \brief View of a side of a bimap that is signature compatible with std::map.
#ifndef BOOST_BIMAP_VIEWS_MAP_VIEW_HPP
#define BOOST_BIMAP_VIEWS_MAP_VIEW_HPP
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/config.hpp>
#include <boost/bimap/container_adaptor/map_adaptor.hpp>
#include <boost/bimap/detail/map_view_base.hpp>
namespace boost {
namespace bimaps {
namespace views {
/// \brief View of a side of a bimap that is signature compatible with std::map.
/**
This class uses container_adaptor and iterator_adaptor to wrapped a index of the
multi_index bimap core so it can be used as a std::map.
See also const_map_view.
                                                                            **/
template< class Tag, class BimapType >
class map_view
:
    public BOOST_BIMAP_MAP_VIEW_CONTAINER_ADAPTOR(
        map_adaptor,
        Tag,BimapType,
        reverse_map_view_iterator,const_reverse_map_view_iterator
    ),
    public ::boost::bimaps::detail::
        map_view_base< map_view<Tag,BimapType>,Tag,BimapType >,
    public ::boost::bimaps::detail::
        unique_map_view_access< map_view<Tag,BimapType>, Tag,  BimapType>::type
{
    typedef BOOST_BIMAP_MAP_VIEW_CONTAINER_ADAPTOR(
        map_adaptor,
        Tag,BimapType,
        reverse_map_view_iterator,const_reverse_map_view_iterator
    ) base_;
    BOOST_BIMAP_MAP_VIEW_BASE_FRIEND(map_view,Tag,BimapType)
    typedef BOOST_DEDUCED_TYPENAME ::boost::bimaps::detail::
        unique_map_view_access<
            map_view<Tag,BimapType>, Tag,  BimapType
        >::type unique_map_view_access_;
    public:
    typedef BOOST_DEDUCED_TYPENAME base_::value_type::info_type info_type;
    map_view(BOOST_DEDUCED_TYPENAME base_::base_type & c) : base_(c) {}
    using unique_map_view_access_::at;
    using unique_map_view_access_::operator[];
    BOOST_BIMAP_MAP_VIEW_RANGE_IMPLEMENTATION(base_)
    map_view & operator=(const map_view & v) 
    {
        this->base() = v.base();
        return *this;
    }
    // It can be used enable_if here but the error message when there 
    // is no info is very clear like this
    template< class CompatibleKey >
    const info_type & info_at(const CompatibleKey& k) const
    {
        BOOST_DEDUCED_TYPENAME base_::const_iterator iter = this->find(k);
        if( iter == this->end() )
        {
            ::boost::throw_exception(
                std::out_of_range("bimap<>: invalid key")
            );
        }
        return iter->info;
    }
    template< class CompatibleKey >
    info_type & info_at(const CompatibleKey& k)
    {
        BOOST_DEDUCED_TYPENAME base_::iterator iter = this->find(k);
        if( iter == this->end() )
        {
            ::boost::throw_exception(
                std::out_of_range("bimap<>: invalid key")
            );
        }
        return iter->info;
    }
};
} // namespace views
/*===========================================================================*/
#define BOOST_BIMAP_MAP_VIEW_EXTRA_TYPEDEF(MAP_VIEW,SIDE,TYPENAME)            \
typedef BOOST_DEDUCED_TYPENAME MAP_VIEW::TYPENAME                             \
    BOOST_PP_CAT(SIDE,BOOST_PP_CAT(_,TYPENAME));
/*===========================================================================*/
/*===========================================================================*/
#define BOOST_BIMAP_MAP_VIEW_EXTRA_TYPEDEFS_BODY(MAP_VIEW,SIDE)               \
    BOOST_BIMAP_MAP_VIEW_EXTRA_TYPEDEF(MAP_VIEW,SIDE,reverse_iterator)        \
    BOOST_BIMAP_MAP_VIEW_EXTRA_TYPEDEF(MAP_VIEW,SIDE,const_reverse_iterator)  \
    BOOST_BIMAP_MAP_VIEW_EXTRA_TYPEDEF(MAP_VIEW,SIDE,range_type)              \
    BOOST_BIMAP_MAP_VIEW_EXTRA_TYPEDEF(MAP_VIEW,SIDE,const_range_type)        \
    BOOST_BIMAP_MAP_VIEW_EXTRA_TYPEDEF(MAP_VIEW,SIDE,key_compare)
/*===========================================================================*/
namespace detail {
template< class Tag, class BimapType >
struct left_map_view_extra_typedefs< ::boost::bimaps::views::map_view<Tag,BimapType> >
{
    private: typedef ::boost::bimaps::views::map_view<Tag,BimapType> map_view_;
    public : BOOST_BIMAP_MAP_VIEW_EXTRA_TYPEDEFS_BODY(map_view_,left)
};
template< class Tag, class BimapType >
struct right_map_view_extra_typedefs< ::boost::bimaps::views::map_view<Tag,BimapType> >
{
    private: typedef ::boost::bimaps::views::map_view<Tag,BimapType> map_view_;
    public : BOOST_BIMAP_MAP_VIEW_EXTRA_TYPEDEFS_BODY(map_view_,right)
};
} // namespace detail
/*===========================================================================*/
#undef BOOST_BIMAP_MAP_VIEW_EXTRA_TYPEDEF
#undef BOOST_BIMAP_MAP_VIEW_EXTRA_TYPEDEFS_BODY
/*===========================================================================*/
} // namespace bimaps
} // namespace boost
#endif // BOOST_BIMAP_VIEWS_MAP_VIEW_HPP