1 /*============================================================================= 2 Copyright (c) 2001-2011 Joel de Guzman 3 4 Distributed under the Boost Software License, Version 1.0. (See accompanying 5 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 6 ==============================================================================*/ 7 #if !defined(FUSION_NEXT_05042005_1101) 8 #define FUSION_NEXT_05042005_1101 9 10 #include <boost/fusion/support/config.hpp> 11 #include <boost/fusion/support/tag_of.hpp> 12 13 namespace boost { namespace fusion 14 { 15 // Special tags: 16 struct iterator_facade_tag; // iterator facade tag 17 struct boost_array_iterator_tag; // boost::array iterator tag 18 struct mpl_iterator_tag; // mpl sequence iterator tag 19 struct std_pair_iterator_tag; // std::pair iterator tag 20 21 namespace extension 22 { 23 template <typename Tag> 24 struct next_impl 25 { 26 template <typename Iterator> 27 struct apply {}; 28 }; 29 30 template <> 31 struct next_impl<iterator_facade_tag> 32 { 33 template <typename Iterator> 34 struct apply : Iterator::template next<Iterator> {}; 35 }; 36 37 template <> 38 struct next_impl<boost_array_iterator_tag>; 39 40 template <> 41 struct next_impl<mpl_iterator_tag>; 42 43 template <> 44 struct next_impl<std_pair_iterator_tag>; 45 } 46 47 namespace result_of 48 { 49 template <typename Iterator> 50 struct next 51 : extension::next_impl<typename detail::tag_of<Iterator>::type>:: 52 template apply<Iterator> 53 {}; 54 } 55 56 template <typename Iterator> 57 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED 58 inline typename result_of::next<Iterator>::type const next(Iterator const & i)59 next(Iterator const& i) 60 { 61 return result_of::next<Iterator>::call(i); 62 } 63 }} 64 65 #endif 66