96 lines
3.1 KiB
C++
96 lines
3.1 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_ADVANCE_09172005_1146)
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#define FUSION_ADVANCE_09172005_1146
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#include <boost/fusion/support/config.hpp>
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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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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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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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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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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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