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92 lines
2.8 KiB
92 lines
2.8 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_ADVANCE_09172005_1146) |
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#define FUSION_ADVANCE_09172005_1146 |
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#include <boost/fusion/iterator/detail/advance.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 advance_impl |
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{ |
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// default implementation |
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template <typename Iterator, typename N> |
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struct apply : |
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mpl::if_c< |
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(N::value > 0) |
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, advance_detail::forward<Iterator, N::value> |
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, advance_detail::backward<Iterator, N::value> |
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>::type |
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{ |
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BOOST_MPL_ASSERT_NOT((traits::is_random_access<Iterator>)); |
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}; |
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}; |
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template <> |
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struct advance_impl<iterator_facade_tag> |
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{ |
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template <typename Iterator, typename N> |
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struct apply : Iterator::template advance<Iterator, N> {}; |
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}; |
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template <> |
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struct advance_impl<boost_array_iterator_tag>; |
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template <> |
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struct advance_impl<mpl_iterator_tag>; |
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template <> |
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struct advance_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, int N> |
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struct advance_c |
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: extension::advance_impl<typename detail::tag_of<Iterator>::type>::template apply<Iterator, mpl::int_<N> > |
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{}; |
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template <typename Iterator, typename N> |
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struct advance |
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: extension::advance_impl<typename detail::tag_of<Iterator>::type>::template apply<Iterator, N> |
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{}; |
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} |
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template <int N, typename Iterator> |
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inline typename result_of::advance_c<Iterator, N>::type const |
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advance_c(Iterator const& i) |
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{ |
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return result_of::advance_c<Iterator, N>::call(i); |
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} |
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template<typename N, typename Iterator> |
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inline typename result_of::advance<Iterator, N>::type const |
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advance(Iterator const& i) |
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{ |
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return result_of::advance<Iterator, N>::call(i); |
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} |
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}} // namespace boost::fusion |
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#endif
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