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63 lines
1.7 KiB
63 lines
1.7 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_PRIOR_05042005_1144) |
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#define FUSION_PRIOR_05042005_1144 |
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#include <boost/fusion/support/tag_of.hpp> |
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namespace boost { namespace fusion |
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{ |
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// Special tags: |
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struct iterator_facade_tag; // iterator facade tag |
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struct boost_array_iterator_tag; // boost::array iterator tag |
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struct mpl_iterator_tag; // mpl sequence iterator tag |
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struct std_pair_iterator_tag; // std::pair iterator tag |
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namespace extension |
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{ |
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template <typename Tag> |
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struct prior_impl |
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{ |
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template <typename Iterator> |
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struct apply {}; |
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}; |
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template <> |
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struct prior_impl<iterator_facade_tag> |
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{ |
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template <typename Iterator> |
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struct apply : Iterator::template prior<Iterator> {}; |
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}; |
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template <> |
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struct prior_impl<boost_array_iterator_tag>; |
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template <> |
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struct prior_impl<mpl_iterator_tag>; |
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template <> |
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struct prior_impl<std_pair_iterator_tag>; |
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} |
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namespace result_of |
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{ |
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template <typename Iterator> |
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struct prior |
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: extension::prior_impl<typename detail::tag_of<Iterator>::type>:: |
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template apply<Iterator> |
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{}; |
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} |
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template <typename Iterator> |
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typename result_of::prior<Iterator>::type const |
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prior(Iterator const& i) |
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{ |
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return result_of::prior<Iterator>::call(i); |
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} |
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}} |
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#endif
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