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