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78 lines
2.4 KiB
78 lines
2.4 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_DISTANCE_09172005_0721) |
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#define FUSION_DISTANCE_09172005_0721 |
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#include <boost/fusion/iterator/detail/distance.hpp> |
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#include <boost/fusion/support/category_of.hpp> |
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#include <boost/mpl/int.hpp> |
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#include <boost/mpl/assert.hpp> |
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#include <boost/type_traits/is_same.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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struct random_access_traversal_tag; |
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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 distance_impl |
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{ |
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// default implementation |
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template <typename First, typename Last> |
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struct apply : distance_detail::linear_distance<First, Last> |
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{}; |
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}; |
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template <> |
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struct distance_impl<iterator_facade_tag> |
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{ |
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template <typename First, typename Last> |
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struct apply : First::template distance<First, Last> {}; |
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}; |
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template <> |
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struct distance_impl<boost_array_iterator_tag>; |
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template <> |
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struct distance_impl<mpl_iterator_tag>; |
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template <> |
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struct distance_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 First, typename Last> |
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struct distance |
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: extension::distance_impl<typename detail::tag_of<First>::type>:: |
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template apply<First, Last> |
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{ |
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typedef typename extension::distance_impl<typename detail::tag_of<First>::type>:: |
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template apply<First, Last>::type distance_application; |
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BOOST_STATIC_CONSTANT(int, value = distance_application::value); |
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}; |
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} |
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template <typename First, typename Last> |
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inline typename result_of::distance<First, Last>::type |
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distance(First const& a, Last const& b) |
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{ |
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return result_of::distance<First, Last>::call(a,b); |
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} |
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}} |
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#endif
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