#ifndef BOOST_MPL_ADVANCE_HPP_INCLUDED | |
#define BOOST_MPL_ADVANCE_HPP_INCLUDED | |
// Copyright Aleksey Gurtovoy 2000-2004 | |
// | |
// 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) | |
// | |
// See http://www.boost.org/libs/mpl for documentation. | |
// $Id: advance.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ | |
// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ | |
// $Revision: 49267 $ | |
#include <boost/mpl/advance_fwd.hpp> | |
#include <boost/mpl/less.hpp> | |
#include <boost/mpl/negate.hpp> | |
#include <boost/mpl/long.hpp> | |
#include <boost/mpl/if.hpp> | |
#include <boost/mpl/tag.hpp> | |
#include <boost/mpl/apply_wrap.hpp> | |
#include <boost/mpl/aux_/advance_forward.hpp> | |
#include <boost/mpl/aux_/advance_backward.hpp> | |
#include <boost/mpl/aux_/value_wknd.hpp> | |
#include <boost/mpl/aux_/na_spec.hpp> | |
#include <boost/mpl/aux_/nttp_decl.hpp> | |
namespace boost { namespace mpl { | |
// default implementation for forward/bidirectional iterators | |
template< typename Tag > | |
struct advance_impl | |
{ | |
template< typename Iterator, typename N > struct apply | |
{ | |
typedef typename less< N,long_<0> >::type backward_; | |
typedef typename if_< backward_, negate<N>, N >::type offset_; | |
typedef typename if_< | |
backward_ | |
, aux::advance_backward< BOOST_MPL_AUX_VALUE_WKND(offset_)::value > | |
, aux::advance_forward< BOOST_MPL_AUX_VALUE_WKND(offset_)::value > | |
>::type f_; | |
typedef typename apply_wrap1<f_,Iterator>::type type; | |
}; | |
}; | |
template< | |
typename BOOST_MPL_AUX_NA_PARAM(Iterator) | |
, typename BOOST_MPL_AUX_NA_PARAM(N) | |
> | |
struct advance | |
: advance_impl< typename tag<Iterator>::type > | |
::template apply<Iterator,N> | |
{ | |
}; | |
template< | |
typename Iterator | |
, BOOST_MPL_AUX_NTTP_DECL(long, N) | |
> | |
struct advance_c | |
: advance_impl< typename tag<Iterator>::type > | |
::template apply<Iterator,long_<N> > | |
{ | |
}; | |
BOOST_MPL_AUX_NA_SPEC(2, advance) | |
}} | |
#endif // BOOST_MPL_ADVANCE_HPP_INCLUDED |