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111 lines
2.9 KiB
111 lines
2.9 KiB
/*============================================================================= |
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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_AT_05042005_0722) |
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#define FUSION_AT_05042005_0722 |
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#include <boost/mpl/int.hpp> |
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#include <boost/type_traits/is_const.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/detail/access.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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struct std_tuple_tag; // std::tuple tag |
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namespace extension |
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{ |
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template <typename Tag> |
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struct at_impl |
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{ |
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template <typename Sequence, typename N> |
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struct apply; |
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}; |
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template <> |
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struct at_impl<sequence_facade_tag> |
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{ |
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template <typename Sequence, typename N> |
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struct apply : Sequence::template at<Sequence, N> {}; |
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}; |
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template <> |
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struct at_impl<boost_tuple_tag>; |
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template <> |
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struct at_impl<boost_array_tag>; |
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template <> |
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struct at_impl<mpl_sequence_tag>; |
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template <> |
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struct at_impl<std_pair_tag>; |
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template <> |
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struct at_impl<std_tuple_tag>; |
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} |
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namespace result_of |
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{ |
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template <typename Sequence, typename N> |
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struct at |
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: extension::at_impl<typename detail::tag_of<Sequence>::type>:: |
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template apply<Sequence, N> |
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{}; |
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template <typename Sequence, int N> |
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struct at_c |
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: at<Sequence, mpl::int_<N> > |
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{}; |
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} |
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template <typename N, typename Sequence> |
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inline typename |
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lazy_disable_if< |
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is_const<Sequence> |
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, result_of::at<Sequence, N> |
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>::type |
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at(Sequence& seq) |
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{ |
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return result_of::at<Sequence, N>::call(seq); |
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} |
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template <typename N, typename Sequence> |
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inline typename result_of::at<Sequence const, N>::type |
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at(Sequence const& seq) |
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{ |
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return result_of::at<Sequence const, N>::call(seq); |
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} |
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template <int N, typename Sequence> |
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inline typename |
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lazy_disable_if< |
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is_const<Sequence> |
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, result_of::at_c<Sequence, N> |
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>::type |
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at_c(Sequence& seq) |
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{ |
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return fusion::at<mpl::int_<N> >(seq); |
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} |
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template <int N, typename Sequence> |
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inline typename result_of::at_c<Sequence const, N>::type |
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at_c(Sequence const& seq) |
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{ |
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return fusion::at<mpl::int_<N> >(seq); |
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} |
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}} |
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#endif |
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