| Jeff Thompson | a28eed8 | 2013-08-22 16:21:10 -0700 | [diff] [blame] | 1 | |
| 2 | #ifndef BOOST_MPL_ADVANCE_HPP_INCLUDED |
| 3 | #define BOOST_MPL_ADVANCE_HPP_INCLUDED |
| 4 | |
| 5 | // Copyright Aleksey Gurtovoy 2000-2004 |
| 6 | // |
| 7 | // Distributed under the Boost Software License, Version 1.0. |
| 8 | // (See accompanying file LICENSE_1_0.txt or copy at |
| 9 | // http://www.boost.org/LICENSE_1_0.txt) |
| 10 | // |
| 11 | // See http://www.boost.org/libs/mpl for documentation. |
| 12 | |
| 13 | // $Id: advance.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ |
| 14 | // $Date: 2008-10-10 23:19:02 -0700 (Fri, 10 Oct 2008) $ |
| 15 | // $Revision: 49267 $ |
| 16 | |
| 17 | #include <ndnboost/mpl/advance_fwd.hpp> |
| 18 | #include <ndnboost/mpl/less.hpp> |
| 19 | #include <ndnboost/mpl/negate.hpp> |
| 20 | #include <ndnboost/mpl/long.hpp> |
| 21 | #include <ndnboost/mpl/if.hpp> |
| 22 | #include <ndnboost/mpl/tag.hpp> |
| 23 | #include <ndnboost/mpl/apply_wrap.hpp> |
| 24 | #include <ndnboost/mpl/aux_/advance_forward.hpp> |
| 25 | #include <ndnboost/mpl/aux_/advance_backward.hpp> |
| 26 | #include <ndnboost/mpl/aux_/value_wknd.hpp> |
| 27 | #include <ndnboost/mpl/aux_/na_spec.hpp> |
| 28 | #include <ndnboost/mpl/aux_/nttp_decl.hpp> |
| 29 | |
| 30 | namespace ndnboost { namespace mpl { |
| 31 | |
| 32 | // default implementation for forward/bidirectional iterators |
| 33 | template< typename Tag > |
| 34 | struct advance_impl |
| 35 | { |
| 36 | template< typename Iterator, typename N > struct apply |
| 37 | { |
| 38 | typedef typename less< N,long_<0> >::type backward_; |
| 39 | typedef typename if_< backward_, negate<N>, N >::type offset_; |
| 40 | |
| 41 | typedef typename if_< |
| 42 | backward_ |
| 43 | , aux::advance_backward< BOOST_MPL_AUX_VALUE_WKND(offset_)::value > |
| 44 | , aux::advance_forward< BOOST_MPL_AUX_VALUE_WKND(offset_)::value > |
| 45 | >::type f_; |
| 46 | |
| 47 | typedef typename apply_wrap1<f_,Iterator>::type type; |
| 48 | }; |
| 49 | }; |
| 50 | |
| 51 | |
| 52 | template< |
| 53 | typename BOOST_MPL_AUX_NA_PARAM(Iterator) |
| 54 | , typename BOOST_MPL_AUX_NA_PARAM(N) |
| 55 | > |
| 56 | struct advance |
| 57 | : advance_impl< typename tag<Iterator>::type > |
| 58 | ::template apply<Iterator,N> |
| 59 | { |
| 60 | }; |
| 61 | |
| 62 | template< |
| 63 | typename Iterator |
| 64 | , BOOST_MPL_AUX_NTTP_DECL(long, N) |
| 65 | > |
| 66 | struct advance_c |
| 67 | : advance_impl< typename tag<Iterator>::type > |
| 68 | ::template apply<Iterator,long_<N> > |
| 69 | { |
| 70 | }; |
| 71 | |
| 72 | BOOST_MPL_AUX_NA_SPEC(2, advance) |
| 73 | |
| 74 | }} |
| 75 | |
| 76 | #endif // BOOST_MPL_ADVANCE_HPP_INCLUDED |