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76 lines
1.9 KiB
76 lines
1.9 KiB
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#ifndef BOOST_MPL_ADVANCE_HPP_INCLUDED |
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#define BOOST_MPL_ADVANCE_HPP_INCLUDED |
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// Copyright Aleksey Gurtovoy 2000-2004 |
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// |
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// Distributed under the Boost Software License, Version 1.0. |
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// (See accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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// |
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// See http://www.boost.org/libs/mpl for documentation. |
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// $Id$ |
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// $Date$ |
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// $Revision$ |
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#include <boost/mpl/advance_fwd.hpp> |
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#include <boost/mpl/less.hpp> |
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#include <boost/mpl/negate.hpp> |
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#include <boost/mpl/long.hpp> |
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#include <boost/mpl/if.hpp> |
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#include <boost/mpl/tag.hpp> |
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#include <boost/mpl/apply_wrap.hpp> |
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#include <boost/mpl/aux_/advance_forward.hpp> |
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#include <boost/mpl/aux_/advance_backward.hpp> |
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#include <boost/mpl/aux_/value_wknd.hpp> |
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#include <boost/mpl/aux_/na_spec.hpp> |
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#include <boost/mpl/aux_/nttp_decl.hpp> |
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namespace boost { namespace mpl { |
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// default implementation for forward/bidirectional iterators |
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template< typename Tag > |
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struct advance_impl |
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{ |
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template< typename Iterator, typename N > struct apply |
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{ |
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typedef typename less< N,long_<0> >::type backward_; |
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typedef typename if_< backward_, negate<N>, N >::type offset_; |
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typedef typename if_< |
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backward_ |
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, aux::advance_backward< BOOST_MPL_AUX_VALUE_WKND(offset_)::value > |
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, aux::advance_forward< BOOST_MPL_AUX_VALUE_WKND(offset_)::value > |
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>::type f_; |
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typedef typename apply_wrap1<f_,Iterator>::type type; |
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}; |
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}; |
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template< |
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typename BOOST_MPL_AUX_NA_PARAM(Iterator) |
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, typename BOOST_MPL_AUX_NA_PARAM(N) |
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> |
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struct advance |
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: advance_impl< typename tag<Iterator>::type > |
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::template apply<Iterator,N> |
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{ |
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}; |
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template< |
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typename Iterator |
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, BOOST_MPL_AUX_NTTP_DECL(long, N) |
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> |
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struct advance_c |
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: advance_impl< typename tag<Iterator>::type > |
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::template apply<Iterator,long_<N> > |
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{ |
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}; |
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BOOST_MPL_AUX_NA_SPEC(2, advance) |
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}} |
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#endif // BOOST_MPL_ADVANCE_HPP_INCLUDED
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