| |
| #ifndef NDNBOOST_MPL_SEQUENCE_TAG_HPP_INCLUDED |
| #define NDNBOOST_MPL_SEQUENCE_TAG_HPP_INCLUDED |
| |
| // Copyright Aleksey Gurtovoy 2000-2004 |
| // |
| // 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) |
| // |
| // See http://www.boost.org/libs/mpl for documentation. |
| |
| // $Id: sequence_tag.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ |
| // $Date: 2008-10-10 23:19:02 -0700 (Fri, 10 Oct 2008) $ |
| // $Revision: 49267 $ |
| |
| #include <ndnboost/mpl/sequence_tag_fwd.hpp> |
| #include <ndnboost/mpl/aux_/has_tag.hpp> |
| #include <ndnboost/mpl/aux_/has_begin.hpp> |
| #include <ndnboost/mpl/aux_/na_spec.hpp> |
| #include <ndnboost/mpl/aux_/is_msvc_eti_arg.hpp> |
| #include <ndnboost/mpl/aux_/config/eti.hpp> |
| #include <ndnboost/mpl/aux_/yes_no.hpp> |
| #include <ndnboost/mpl/aux_/config/workaround.hpp> |
| |
| namespace ndnboost { namespace mpl { |
| |
| // agurt, 27/nov/02: have to use a simplistic 'sequence_tag' implementation |
| // on MSVC to avoid dreadful "internal structure overflow" error |
| #if NDNBOOST_WORKAROUND(NDNBOOST_MSVC, < 1300) \ |
| || defined(NDNBOOST_MPL_CFG_NO_HAS_XXX) |
| |
| template< |
| typename NDNBOOST_MPL_AUX_NA_PARAM(Sequence) |
| > |
| struct sequence_tag |
| { |
| typedef typename Sequence::tag type; |
| }; |
| |
| #elif NDNBOOST_WORKAROUND(NDNBOOST_MSVC, == 1300) |
| |
| // agurt, 07/feb/03: workaround for what seems to be MSVC 7.0-specific ETI issue |
| |
| namespace aux { |
| |
| template< bool > |
| struct sequence_tag_impl |
| { |
| template< typename Sequence > struct result_ |
| { |
| typedef typename Sequence::tag type; |
| }; |
| }; |
| |
| template<> |
| struct sequence_tag_impl<false> |
| { |
| template< typename Sequence > struct result_ |
| { |
| typedef int type; |
| }; |
| }; |
| |
| } // namespace aux |
| |
| template< |
| typename NDNBOOST_MPL_AUX_NA_PARAM(Sequence) |
| > |
| struct sequence_tag |
| : aux::sequence_tag_impl< !aux::is_msvc_eti_arg<Sequence>::value > |
| ::template result_<Sequence> |
| { |
| }; |
| |
| #else |
| |
| namespace aux { |
| |
| template< bool has_tag_, bool has_begin_ > |
| struct sequence_tag_impl |
| { |
| // agurt 24/nov/02: MSVC 6.5 gets confused in 'sequence_tag_impl<true>' |
| // specialization below, if we name it 'result_' here |
| template< typename Sequence > struct result2_; |
| }; |
| |
| # define AUX_CLASS_SEQUENCE_TAG_SPEC(has_tag, has_begin, result_type) \ |
| template<> struct sequence_tag_impl<has_tag,has_begin> \ |
| { \ |
| template< typename Sequence > struct result2_ \ |
| { \ |
| typedef result_type type; \ |
| }; \ |
| }; \ |
| /**/ |
| |
| AUX_CLASS_SEQUENCE_TAG_SPEC(true, true, typename Sequence::tag) |
| AUX_CLASS_SEQUENCE_TAG_SPEC(true, false, typename Sequence::tag) |
| AUX_CLASS_SEQUENCE_TAG_SPEC(false, true, nested_begin_end_tag) |
| AUX_CLASS_SEQUENCE_TAG_SPEC(false, false, non_sequence_tag) |
| |
| # undef AUX_CLASS_SEQUENCE_TAG_SPEC |
| |
| } // namespace aux |
| |
| template< |
| typename NDNBOOST_MPL_AUX_NA_PARAM(Sequence) |
| > |
| struct sequence_tag |
| : aux::sequence_tag_impl< |
| ::ndnboost::mpl::aux::has_tag<Sequence>::value |
| , ::ndnboost::mpl::aux::has_begin<Sequence>::value |
| >::template result2_<Sequence> |
| { |
| }; |
| |
| #endif // NDNBOOST_MSVC |
| |
| NDNBOOST_MPL_AUX_NA_SPEC(1, sequence_tag) |
| |
| }} |
| |
| #endif // NDNBOOST_MPL_SEQUENCE_TAG_HPP_INCLUDED |