/*============================================================================= Copyright (c) 2001-2011 Joel de Guzman Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) ==============================================================================*/ #if !defined(FUSION_ADVANCE_09172005_1146) #define FUSION_ADVANCE_09172005_1146 #include <boost/fusion/support/config.hpp> #include <boost/fusion/iterator/detail/advance.hpp> #include <boost/fusion/support/category_of.hpp> #include <boost/mpl/int.hpp> #include <boost/mpl/assert.hpp> #include <boost/type_traits/is_same.hpp> #include <boost/fusion/support/tag_of.hpp> namespace boost { namespace fusion { struct random_access_traversal_tag; // Special tags: struct iterator_facade_tag; // iterator facade tag struct boost_array_iterator_tag; // boost::array iterator tag struct mpl_iterator_tag; // mpl sequence iterator tag struct std_pair_iterator_tag; // std::pair iterator tag namespace extension { template <typename Tag> struct advance_impl { // default implementation template <typename Iterator, typename N> struct apply : mpl::if_c< (N::value > 0) , advance_detail::forward<Iterator, N::value> , advance_detail::backward<Iterator, N::value> >::type { BOOST_MPL_ASSERT_NOT((traits::is_random_access<Iterator>)); }; }; template <> struct advance_impl<iterator_facade_tag> { template <typename Iterator, typename N> struct apply : Iterator::template advance<Iterator, N> {}; }; template <> struct advance_impl<boost_array_iterator_tag>; template <> struct advance_impl<mpl_iterator_tag>; template <> struct advance_impl<std_pair_iterator_tag>; } namespace result_of { template <typename Iterator, int N> struct advance_c : extension::advance_impl<typename detail::tag_of<Iterator>::type>::template apply<Iterator, mpl::int_<N> > {}; template <typename Iterator, typename N> struct advance : extension::advance_impl<typename detail::tag_of<Iterator>::type>::template apply<Iterator, N> {}; } template <int N, typename Iterator> BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED inline typename result_of::advance_c<Iterator, N>::type const advance_c(Iterator const& i) { return result_of::advance_c<Iterator, N>::call(i); } template<typename N, typename Iterator> BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED inline typename result_of::advance<Iterator, N>::type const advance(Iterator const& i) { return result_of::advance<Iterator, N>::call(i); } }} // namespace boost::fusion #endif