137 lines
3.0 KiB
C++
137 lines
3.0 KiB
C++
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#ifndef BOOST_MPL_SET_AUX_AT_IMPL_HPP_INCLUDED
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#define BOOST_MPL_SET_AUX_AT_IMPL_HPP_INCLUDED
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// Copyright Aleksey Gurtovoy 2003-2004
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// Copyright David Abrahams 2003-2004
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/mpl for documentation.
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// $Source$
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// $Date$
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// $Revision$
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#include <boost/mpl/at_fwd.hpp>
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#include <boost/mpl/long.hpp>
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#include <boost/mpl/map/aux_/tag.hpp>
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#include <boost/mpl/aux_/order_impl.hpp>
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#include <boost/mpl/aux_/type_wrapper.hpp>
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#include <boost/mpl/aux_/ptr_to_ref.hpp>
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#include <boost/mpl/aux_/static_cast.hpp>
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#include <boost/mpl/aux_/config/typeof.hpp>
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#if !defined(BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES)
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# include <boost/mpl/eval_if.hpp>
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# include <boost/mpl/pair.hpp>
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# include <boost/mpl/void.hpp>
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#endif
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namespace boost { namespace mpl {
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#if defined(BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES)
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template< typename Map, typename Key >
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struct m_at
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{
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typedef aux::type_wrapper<Key> key_;
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typedef __typeof__( aux::ptr_to_ref(BOOST_MPL_AUX_STATIC_CAST(Map*, 0))
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| BOOST_MPL_AUX_STATIC_CAST(key_*, 0) ) type;
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};
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template<>
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struct at_impl< aux::map_tag >
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{
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template< typename Map, typename Key > struct apply
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: aux::wrapped_type< typename m_at<
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Map
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, Key
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>::type >
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{
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};
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};
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// agurt 31/jan/04: two-step implementation for the sake of GCC 3.x
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template< typename Map, long order >
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struct item_by_order_impl
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{
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typedef __typeof__( aux::ptr_to_ref(BOOST_MPL_AUX_STATIC_CAST(Map*, 0))
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|| long_<order>() ) type;
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};
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template< typename Map, long order >
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struct item_by_order
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: aux::wrapped_type<
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typename item_by_order_impl<Map,order>::type
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>
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{
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};
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#else // BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES
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template< typename Map, long n > struct m_at
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{
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typedef void_ type;
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};
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template< typename Map>
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struct m_at<Map,2>
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{
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typedef typename Map::type1 type;
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};
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template< typename Map>
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struct m_at<Map,3>
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{
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typedef typename Map::type2 type;
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};
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template< typename Map>
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struct m_at<Map,4>
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{
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typedef typename Map::type3 type;
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};
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template<>
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struct at_impl< aux::map_tag >
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{
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template< typename Map, typename Key > struct apply
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{
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typedef typename m_at<
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Map
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, x_order_impl<Map,Key>::value
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>::type type_;
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typedef typename eval_if<
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is_void_<type_>
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, void_
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, second<type_>
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>::type type;
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};
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};
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template< typename Map, long order > struct item_by_order
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{
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BOOST_STATIC_CONSTANT(bool, is_deleted_ =
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sizeof(
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*BOOST_MPL_AUX_STATIC_CAST(Map*, 0)
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% BOOST_MPL_AUX_STATIC_CAST(long_<order>*, 0)
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) - 1
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);
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typedef typename eval_if_c<
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is_deleted_
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, void_
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, m_at<Map,order>
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>::type type;
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};
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#endif
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}}
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#endif // BOOST_MPL_SET_AUX_AT_IMPL_HPP_INCLUDED
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