2 #ifndef BOOST_MPL_ADVANCE_HPP_INCLUDED
3 #define BOOST_MPL_ADVANCE_HPP_INCLUDED
5 // Copyright Aleksey Gurtovoy 2000-2004
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)
11 // See http://www.boost.org/libs/mpl for documentation.
13 // $Source: /cvsroot/boost/boost/boost/mpl/advance.hpp,v $
14 // $Date: 2004/09/02 15:40:41 $
17 #include <boost/mpl/advance_fwd.hpp>
18 #include <boost/mpl/less.hpp>
19 #include <boost/mpl/negate.hpp>
20 #include <boost/mpl/long.hpp>
21 #include <boost/mpl/if.hpp>
22 #include <boost/mpl/tag.hpp>
23 #include <boost/mpl/apply_wrap.hpp>
24 #include <boost/mpl/aux_/advance_forward.hpp>
25 #include <boost/mpl/aux_/advance_backward.hpp>
26 #include <boost/mpl/aux_/value_wknd.hpp>
27 #include <boost/mpl/aux_/na_spec.hpp>
28 #include <boost/mpl/aux_/nttp_decl.hpp>
30 namespace boost { namespace mpl {
32 // default implementation for forward/bidirectional iterators
33 template< typename Tag >
36 template< typename Iterator, typename N > struct apply
38 typedef typename less< N,long_<0> >::type backward_;
39 typedef typename if_< backward_, negate<N>, N >::type offset_;
43 , aux::advance_backward< BOOST_MPL_AUX_VALUE_WKND(offset_)::value >
44 , aux::advance_forward< BOOST_MPL_AUX_VALUE_WKND(offset_)::value >
47 typedef typename apply_wrap1<f_,Iterator>::type type;
53 typename BOOST_MPL_AUX_NA_PARAM(Iterator)
54 , typename BOOST_MPL_AUX_NA_PARAM(N)
57 : advance_impl< typename tag<Iterator>::type >
58 ::template apply<Iterator,N>
64 , BOOST_MPL_AUX_NTTP_DECL(long, N)
67 : advance_impl< typename tag<Iterator>::type >
68 ::template apply<Iterator,long_<N> >
72 BOOST_MPL_AUX_NA_SPEC(2, advance)
76 #endif // BOOST_MPL_ADVANCE_HPP_INCLUDED