author | Alex Gilkes <alex.gilkes@nokia.com> |
Tue, 27 Oct 2009 16:36:35 +0000 | |
changeset 0 | 044383f39525 |
permissions | -rw-r--r-- |
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#ifndef BOOST_MPL_SEQUENCE_TAG_HPP_INCLUDED |
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#define BOOST_MPL_SEQUENCE_TAG_HPP_INCLUDED |
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// Copyright Aleksey Gurtovoy 2000-2004 |
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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: sequence_tag.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/sequence_tag_fwd.hpp> |
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#include <boost/mpl/aux_/has_tag.hpp> |
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#include <boost/mpl/aux_/has_begin.hpp> |
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#include <boost/mpl/aux_/na_spec.hpp> |
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#include <boost/mpl/aux_/is_msvc_eti_arg.hpp> |
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#include <boost/mpl/aux_/config/eti.hpp> |
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#include <boost/mpl/aux_/yes_no.hpp> |
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#include <boost/mpl/aux_/config/workaround.hpp> |
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namespace boost { namespace mpl { |
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// agurt, 27/nov/02: have to use a simplistic 'sequence_tag' implementation |
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// on MSVC to avoid dreadful "internal structure overflow" error |
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#if BOOST_WORKAROUND(BOOST_MSVC, < 1300) \ |
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|| defined(BOOST_MPL_CFG_NO_HAS_XXX) |
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template< |
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typename BOOST_MPL_AUX_NA_PARAM(Sequence) |
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> |
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struct sequence_tag |
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{ |
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typedef typename Sequence::tag type; |
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}; |
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#elif BOOST_WORKAROUND(BOOST_MSVC, == 1300) |
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// agurt, 07/feb/03: workaround for what seems to be MSVC 7.0-specific ETI issue |
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namespace aux { |
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template< bool > |
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struct sequence_tag_impl |
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{ |
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template< typename Sequence > struct result_ |
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{ |
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typedef typename Sequence::tag type; |
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}; |
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}; |
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template<> |
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struct sequence_tag_impl<false> |
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{ |
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template< typename Sequence > struct result_ |
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{ |
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typedef int type; |
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}; |
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}; |
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} // namespace aux |
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template< |
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typename BOOST_MPL_AUX_NA_PARAM(Sequence) |
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> |
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struct sequence_tag |
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: aux::sequence_tag_impl< !aux::is_msvc_eti_arg<Sequence>::value > |
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::template result_<Sequence> |
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{ |
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}; |
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#else |
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namespace aux { |
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template< bool has_tag_, bool has_begin_ > |
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struct sequence_tag_impl |
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{ |
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// agurt 24/nov/02: MSVC 6.5 gets confused in 'sequence_tag_impl<true>' |
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// specialization below, if we name it 'result_' here |
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template< typename Sequence > struct result2_; |
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}; |
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# define AUX_CLASS_SEQUENCE_TAG_SPEC(has_tag, has_begin, result_type) \ |
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template<> struct sequence_tag_impl<has_tag,has_begin> \ |
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{ \ |
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template< typename Sequence > struct result2_ \ |
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{ \ |
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typedef result_type type; \ |
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}; \ |
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}; \ |
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/**/ |
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AUX_CLASS_SEQUENCE_TAG_SPEC(true, true, typename Sequence::tag) |
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AUX_CLASS_SEQUENCE_TAG_SPEC(true, false, typename Sequence::tag) |
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AUX_CLASS_SEQUENCE_TAG_SPEC(false, true, nested_begin_end_tag) |
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AUX_CLASS_SEQUENCE_TAG_SPEC(false, false, non_sequence_tag) |
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# undef AUX_CLASS_SEQUENCE_TAG_SPEC |
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} // namespace aux |
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template< |
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typename BOOST_MPL_AUX_NA_PARAM(Sequence) |
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> |
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struct sequence_tag |
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: aux::sequence_tag_impl< |
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::boost::mpl::aux::has_tag<Sequence>::value |
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, ::boost::mpl::aux::has_begin<Sequence>::value |
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>::template result2_<Sequence> |
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{ |
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}; |
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#endif // BOOST_MSVC |
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BOOST_MPL_AUX_NA_SPEC(1, sequence_tag) |
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}} |
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#endif // BOOST_MPL_SEQUENCE_TAG_HPP_INCLUDED |