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87 lines
2.5 KiB
87 lines
2.5 KiB
3 years ago
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/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#if !defined(FUSION_SIZE_05052005_0214)
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#define FUSION_SIZE_05052005_0214
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#include <boost/fusion/support/config.hpp>
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#include <boost/utility/enable_if.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/int.hpp>
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#include <boost/fusion/sequence/intrinsic_fwd.hpp>
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#include <boost/fusion/support/tag_of.hpp>
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#include <boost/fusion/support/is_segmented.hpp>
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#include <boost/fusion/sequence/intrinsic/detail/segmented_size.hpp>
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namespace boost { namespace fusion
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{
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// Special tags:
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struct sequence_facade_tag;
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struct boost_tuple_tag; // boost::tuples::tuple tag
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struct boost_array_tag; // boost::array tag
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struct mpl_sequence_tag; // mpl sequence tag
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struct std_pair_tag; // std::pair tag
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namespace extension
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{
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template <typename Tag>
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struct size_impl
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{
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template<typename Sequence>
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struct unsegmented_size : Sequence::size {};
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template <typename Sequence>
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struct apply
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: mpl::if_<
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traits::is_segmented<Sequence>
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, detail::segmented_size<Sequence>
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, unsegmented_size<Sequence>
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>::type
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{};
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};
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template <>
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struct size_impl<sequence_facade_tag>
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{
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template <typename Sequence>
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struct apply : Sequence::template size<Sequence> {};
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};
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template <>
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struct size_impl<boost_tuple_tag>;
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template <>
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struct size_impl<boost_array_tag>;
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template <>
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struct size_impl<mpl_sequence_tag>;
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template <>
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struct size_impl<std_pair_tag>;
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}
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namespace result_of
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{
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template <typename Sequence>
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struct size
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: mpl::int_<
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extension::size_impl<typename detail::tag_of<Sequence>::type>
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::template apply<Sequence>::type::value
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> {};
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}
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template <typename Sequence>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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inline typename result_of::size<Sequence>::type
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size(Sequence const&)
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{
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typedef typename result_of::size<Sequence>::type result;
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return result();
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}
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}}
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#endif
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