Generated on Thu Mar 22 10:39:45 2012 for Gecode by doxygen 1.6.3

nosubset.hpp

Go to the documentation of this file.
00001 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
00002 /*
00003  *  Main authors:
00004  *     Guido Tack <tack@gecode.org>
00005  *     Christian Schulte <schulte@gecode.org>
00006  *     Gabor Szokoli <szokoli@gecode.org>
00007  *
00008  *  Copyright:
00009  *     Guido Tack, 2004
00010  *     Christian Schulte, 2004
00011  *     Gabor Szokoli, 2004
00012  *
00013  *  Last modified:
00014  *     $Date: 2010-03-03 17:32:21 +0100 (Wed, 03 Mar 2010) $ by $Author: schulte $
00015  *     $Revision: 10364 $
00016  *
00017  *  This file is part of Gecode, the generic constraint
00018  *  development environment:
00019  *     http://www.gecode.org
00020  *
00021  *  Permission is hereby granted, free of charge, to any person obtaining
00022  *  a copy of this software and associated documentation files (the
00023  *  "Software"), to deal in the Software without restriction, including
00024  *  without limitation the rights to use, copy, modify, merge, publish,
00025  *  distribute, sublicense, and/or sell copies of the Software, and to
00026  *  permit persons to whom the Software is furnished to do so, subject to
00027  *  the following conditions:
00028  *
00029  *  The above copyright notice and this permission notice shall be
00030  *  included in all copies or substantial portions of the Software.
00031  *
00032  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00033  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00034  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00035  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
00036  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
00037  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00038  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00039  *
00040  */
00041 
00042 namespace Gecode { namespace Set { namespace Rel {
00043 
00044   /*
00045    * "No Subset" propagator
00046    *
00047    */
00048 
00049   template<class View0, class View1>
00050   forceinline
00051   NoSubset<View0,View1>::NoSubset(Home home, View0 y0, View1 y1)
00052     : MixBinaryPropagator<View0,PC_SET_CLUB,
00053                             View1,PC_SET_CGLB>(home,y0,y1) {}
00054 
00055   template<class View0, class View1>
00056   forceinline
00057   NoSubset<View0,View1>::NoSubset(Space& home, bool share,
00058                                   NoSubset<View0,View1>& p)
00059     : MixBinaryPropagator<View0,PC_SET_CLUB,
00060                             View1,PC_SET_CGLB>(home,share,p) {}
00061 
00062   template<class View0, class View1>
00063   ExecStatus
00064   NoSubset<View0,View1>::post(Home home, View0 x, View1 y) {
00065     if (me_failed(x.cardMin(home,1)))
00066       return ES_FAILED;
00067     (void) new (home) NoSubset<View0,View1>(home,x,y);
00068     return ES_OK;
00069   }
00070 
00071   template<class View0, class View1>
00072   Actor*
00073   NoSubset<View0,View1>::copy(Space& home, bool share) {
00074     return new (home) NoSubset<View0,View1>(home,share,*this);
00075   }
00076 
00077   template<class View0, class View1>
00078   ExecStatus
00079   NoSubset<View0,View1>::propagate(Space& home, const ModEventDelta&) {
00080     GlbRanges<View0> x0lb(x0);
00081     LubRanges<View1> x1ub(x1);
00082     if (!Iter::Ranges::subset(x0lb, x1ub))
00083       return home.ES_SUBSUMED(*this);
00084     if (x0.cardMin()>x1.cardMax()) { return home.ES_SUBSUMED(*this); }
00085     LubRanges<View0> x0ub(x0);
00086     GlbRanges<View1> x1lb(x1);
00087     Iter::Ranges::Diff<LubRanges<View0>,GlbRanges<View1> >
00088       breakers(x0ub,x1lb);
00089     if (!breakers()) { return ES_FAILED; }
00090     if (breakers.min() == breakers.max()) {
00091       int b1 = breakers.min();
00092       ++breakers;
00093       if (breakers()) { return ES_FIX; }
00094       //Only one subsetness-breaker element left:
00095       GECODE_ME_CHECK( x0.include(home,b1) );
00096       GECODE_ME_CHECK( x1.exclude(home,b1) );
00097       return home.ES_SUBSUMED(*this);
00098     }
00099     return ES_FIX;
00100   }
00101 
00102 }}}
00103 
00104 // STATISTICS: set-prop