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seq-u.cpp

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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 #include <gecode/set/sequence.hh>
00041 
00042 namespace Gecode { namespace Set { namespace Sequence {
00043 
00044   /*
00045    * "Sequenced union" propagator
00046    *
00047    */
00048 
00049   Actor*
00050   SeqU::copy(Space& home) {
00051     return new (home) SeqU(home,*this);
00052   }
00053 
00054   ExecStatus
00055   SeqU::propagateSeqUnion(Space& home,
00056                           bool& modified, ViewArray<SetView>& x,
00057                           SetView& y) {
00058     Region r;
00059     GlbRanges<SetView>* XLBs = r.alloc<GlbRanges<SetView> >(x.size());
00060     for (int i=x.size(); i--; ) {
00061       GlbRanges<SetView> lb(x[i]);
00062       XLBs[i]=lb;
00063     }
00064     Iter::Ranges::NaryAppend<GlbRanges<SetView> > u(XLBs,x.size());
00065     GECODE_ME_CHECK_MODIFIED(modified, y.includeI(home,u));
00066 
00067     GLBndSet before(home);
00068     for (int i=0; i<x.size(); i++) {
00069       LubRanges<SetView> xiub(x[i]);
00070       before.includeI(home, xiub);
00071       BndSetRanges beforeR(before);
00072       GlbRanges<SetView> ylb(y);
00073       Iter::Ranges::Diff<GlbRanges<SetView>, BndSetRanges> diff(ylb, beforeR);
00074       if (diff()) {
00075         GECODE_ME_CHECK_MODIFIED(modified, x[i].exclude(home, diff.min(),
00076                                                         Limits::max));
00077       }
00078     }
00079     before.dispose(home);
00080 
00081     GLBndSet after(home);
00082     for (int i=x.size(); i--; ) {
00083       LubRanges<SetView> xiub(x[i]);
00084       after.includeI(home, xiub);
00085       BndSetRanges afterR(after);
00086       GlbRanges<SetView> ylb(y);
00087       Iter::Ranges::Diff<GlbRanges<SetView>, BndSetRanges> diff(ylb, afterR);
00088       if (diff()) {
00089         int max = diff.max();
00090         for (; diff(); ++diff)
00091           max = diff.max();
00092         GECODE_ME_CHECK_MODIFIED(modified, x[i].exclude(home,
00093                                                         Limits::min,
00094                                                         max));
00095       }
00096     }
00097     after.dispose(home);
00098 
00099     return ES_FIX;
00100   }
00101 
00102   //Enforces sequentiality and ensures y contains union of Xi lower bounds.
00103   ExecStatus
00104   SeqU::propagate(Space& home, const ModEventDelta& med) {
00105     ModEvent me0 = SetView::me(med);
00106     bool ubevent = Rel::testSetEventUB(me0);
00107     bool anybevent = Rel::testSetEventAnyB(me0);
00108     bool cardevent = Rel::testSetEventCard(me0);
00109 
00110     bool modified = false;
00111     bool assigned=false;
00112     bool oldModified = false;
00113 
00114     do {
00115       oldModified = modified;
00116       modified = false;
00117 
00118       if (oldModified || modified || anybevent || cardevent)
00119         GECODE_ES_CHECK(propagateSeq(home,modified,assigned,x));
00120       if (oldModified || modified || anybevent)
00121         GECODE_ES_CHECK(propagateSeqUnion(home,modified,x,y));
00122       if (oldModified || modified || ubevent)
00123         GECODE_ES_CHECK(RelOp::unionNXiUB(home,modified,x,y,unionOfDets));
00124       if (oldModified || modified || ubevent)
00125         GECODE_ES_CHECK(RelOp::partitionNYUB(home,modified,x,y,unionOfDets));
00126       if (oldModified || modified || anybevent)
00127         GECODE_ES_CHECK(RelOp::partitionNXiLB(home,modified,x,y,unionOfDets));
00128       if (oldModified || modified || cardevent || ubevent)
00129         GECODE_ES_CHECK(RelOp::partitionNCard(home,modified,x,y,unionOfDets));
00130 
00131     } while (modified);
00132 
00133     for (int i=x.size(); i--;)
00134       if (!x[i].assigned())
00135         return ES_FIX;
00136     return home.ES_SUBSUMED(*this);
00137   }
00138 
00139 }}}
00140 
00141 // STATISTICS: set-prop