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72 lines
2.0 KiB
72 lines
2.0 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_DEREF_05042005_1019) |
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#define FUSION_DEREF_05042005_1019 |
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#include <boost/fusion/support/iterator_base.hpp> |
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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 deref_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 deref_impl<iterator_facade_tag> |
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{ |
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template <typename Iterator> |
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struct apply : Iterator::template deref<Iterator> {}; |
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}; |
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template <> |
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struct deref_impl<boost_array_iterator_tag>; |
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template <> |
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struct deref_impl<mpl_iterator_tag>; |
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template <> |
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struct deref_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 deref |
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: extension::deref_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::deref<Iterator>::type |
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deref(Iterator const& i) |
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{ |
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typedef result_of::deref<Iterator> deref_meta; |
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return deref_meta::call(i); |
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} |
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template <typename Iterator> |
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typename result_of::deref<Iterator>::type |
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operator*(iterator_base<Iterator> const& i) |
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{ |
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return fusion::deref(i.cast()); |
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} |
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}} |
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#endif
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