76 lines
2.2 KiB
C++
76 lines
2.2 KiB
C++
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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_DEREF_05042005_1019)
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#define FUSION_DEREF_05042005_1019
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#include <boost/fusion/support/config.hpp>
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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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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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inline 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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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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inline 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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