subset.hpp

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  *
00007  *  Contributing authors:
00008  *     Gabor Szokoli <szokoli@gecode.org>
00009  *
00010  *  Copyright:
00011  *     Guido Tack, 2004
00012  *     Christian Schulte, 2004
00013  *     Gabor Szokoli, 2004
00014  *
00015  *  Last modified:
00016  *     $Date: 2010-03-03 17:32:21 +0100 (Wed, 03 Mar 2010) $ by $Author: schulte $
00017  *     $Revision: 10364 $
00018  *
00019  *  This file is part of Gecode, the generic constraint
00020  *  development environment:
00021  *     http://www.gecode.org
00022  *
00023  *  Permission is hereby granted, free of charge, to any person obtaining
00024  *  a copy of this software and associated documentation files (the
00025  *  "Software"), to deal in the Software without restriction, including
00026  *  without limitation the rights to use, copy, modify, merge, publish,
00027  *  distribute, sublicense, and/or sell copies of the Software, and to
00028  *  permit persons to whom the Software is furnished to do so, subject to
00029  *  the following conditions:
00030  *
00031  *  The above copyright notice and this permission notice shall be
00032  *  included in all copies or substantial portions of the Software.
00033  *
00034  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00035  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00036  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00037  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
00038  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
00039  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00040  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00041  *
00042  */
00043 
00044 namespace Gecode { namespace Set { namespace Rel {
00045 
00046   template<class View0, class View1>
00047   forceinline
00048   Subset<View0,View1>::Subset(Home home, View0 y0, View1 y1)
00049     : MixBinaryPropagator<View0,PC_SET_CGLB,
00050                             View1,PC_SET_CLUB>(home,y0,y1) {}
00051 
00052   template<class View0, class View1>
00053   forceinline
00054   Subset<View0,View1>::Subset(Space& home, bool share, Subset& p)
00055     : MixBinaryPropagator<View0,PC_SET_CGLB,
00056                             View1,PC_SET_CLUB>(home,share,p) {}
00057 
00058   template<class View0, class View1>
00059   ExecStatus Subset<View0,View1>::post(Home home, View0 x, View1 y) {
00060     (void) new (home) Subset(home,x,y);
00061     return ES_OK;
00062   }
00063 
00064   template<class View0, class View1>
00065   Actor*
00066   Subset<View0,View1>::copy(Space& home, bool share) {
00067     return new (home) Subset(home,share,*this);
00068   }
00069 
00070   template<class View0, class View1>
00071   ExecStatus
00072   Subset<View0,View1>::propagate(Space& home, const ModEventDelta&) {
00073     bool oneassigned = x0.assigned() || x1.assigned();
00074     unsigned int x0glbsize;
00075     do {
00076       GlbRanges<View0> x0lb(x0);
00077       GECODE_ME_CHECK ( x1.includeI(home,x0lb) );
00078       GECODE_ME_CHECK ( x1.cardMin(home,x0.cardMin()) );
00079       LubRanges<View1> x1ub(x1);
00080       x0glbsize = x0.glbSize();
00081       GECODE_ME_CHECK ( x0.intersectI(home,x1ub) );
00082       GECODE_ME_CHECK ( x0.cardMax(home,x1.cardMax()) );
00083     } while (x0.glbSize() > x0glbsize);
00084 
00085     if (x0.cardMin() == x1.cardMax())
00086       GECODE_REWRITE(*this,(Eq<View0,View1>::post(home(*this),x0,x1)));
00087 
00088     if (shared(x0,x1)) {
00089       return oneassigned ? home.ES_SUBSUMED(*this) : ES_NOFIX;
00090     }
00091     return (x0.assigned() || x1.assigned()) ? home.ES_SUBSUMED(*this) : ES_FIX;
00092   }
00093 
00094 }}}
00095 
00096 // STATISTICS: set-prop