1 /*=============================================================================
2 Copyright (c) 2001-2006 Joel de Guzman
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_PRIOR_05042005_1144)
8 #define FUSION_PRIOR_05042005_1144
10 #include <boost/fusion/support/tag_of.hpp>
12 namespace boost { namespace fusion
15 struct iterator_facade_tag; // iterator facade tag
16 struct boost_array_iterator_tag; // boost::array iterator tag
17 struct mpl_iterator_tag; // mpl sequence iterator tag
18 struct std_pair_iterator_tag; // std::pair iterator tag
22 template <typename Tag>
25 template <typename Iterator>
30 struct prior_impl<iterator_facade_tag>
32 template <typename Iterator>
33 struct apply : Iterator::template prior<Iterator> {};
37 struct prior_impl<boost_array_iterator_tag>;
40 struct prior_impl<mpl_iterator_tag>;
43 struct prior_impl<std_pair_iterator_tag>;
48 template <typename Iterator>
50 : extension::prior_impl<typename detail::tag_of<Iterator>::type>::
51 template apply<Iterator>
55 template <typename Iterator>
56 typename result_of::prior<Iterator>::type const
57 prior(Iterator const& i)
59 return result_of::prior<Iterator>::call(i);