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59 lines
1.7 KiB
59 lines
1.7 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_VALUE_OF_05052005_1126)
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#define FUSION_VALUE_OF_05052005_1126
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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 value_of_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 value_of_impl<iterator_facade_tag>
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{
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template <typename Iterator>
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struct apply : Iterator::template value_of<Iterator> {};
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};
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template <>
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struct value_of_impl<boost_array_iterator_tag>;
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template <>
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struct value_of_impl<mpl_iterator_tag>;
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template <>
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struct value_of_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 value_of
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: extension::value_of_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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}}
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#endif
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