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144 lines
3.4 KiB
144 lines
3.4 KiB
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#ifndef BOOST_MPL_MAP_AUX_AT_IMPL_HPP_INCLUDED |
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#define BOOST_MPL_MAP_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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// $Id: at_impl.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ |
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// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ |
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// $Revision: 49267 $ |
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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_/overload_names.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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#include <boost/mpl/aux_/config/ctps.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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# include <boost/mpl/aux_/config/static_constant.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__( BOOST_MPL_AUX_OVERLOAD_CALL_VALUE_BY_KEY( |
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Map |
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, BOOST_MPL_AUX_STATIC_CAST(key_*, 0) |
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) ) 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__( BOOST_MPL_AUX_OVERLOAD_CALL_ITEM_BY_ORDER( |
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Map |
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, BOOST_MPL_AUX_STATIC_CAST(long_<order>*, 0) |
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) ) 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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# if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) |
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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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# else |
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template< long n > struct m_at_impl |
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{ |
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template< typename Map > struct result_ |
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{ |
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typedef void_ type; |
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}; |
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}; |
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template< typename Map, long n > struct m_at |
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{ |
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typedef typename m_at_impl<n>::result_<Map>::type type; |
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}; |
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# endif |
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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< Map, (x_order_impl<Map,Key>::value - 2) >::type item_; |
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typedef typename eval_if< |
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is_void_<item_> |
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, void_ |
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, second<item_> |
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>::type type; |
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}; |
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}; |
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template< typename Map, long order > struct is_item_masked |
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{ |
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BOOST_STATIC_CONSTANT(bool, value = |
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sizeof( BOOST_MPL_AUX_OVERLOAD_CALL_IS_MASKED( |
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Map |
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, BOOST_MPL_AUX_STATIC_CAST(long_<order>*, 0) |
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) ) == sizeof(aux::yes_tag) |
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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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typedef typename eval_if_c< |
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is_item_masked<Map,order>::value |
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, void_ |
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, m_at<Map,(order - 2)> |
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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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