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subset.hpp

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