subofunion.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 * 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 RelOp { 00045 00046 template<class View0, class View1, class View2> 00047 Actor* 00048 SubOfUnion<View0,View1,View2>::copy(Space& home, bool share) { 00049 return new (home) SubOfUnion(home,share,*this); 00050 } 00051 00052 template<class View0, class View1, class View2> 00053 ExecStatus 00054 SubOfUnion<View0,View1,View2>::propagate(Space& home, const ModEventDelta& med) { 00055 00056 bool allassigned = x0.assigned() && x1.assigned() && x2.assigned(); 00057 00058 ModEvent me0 = View0::me(med); 00059 ModEvent me1 = View1::me(med); 00060 ModEvent me2 = View2::me(med); 00061 00062 bool modified=false; 00063 00064 do { 00065 // lub(x2) <= lub(x0) u lub(x1) 00066 if (modified || Rel::testSetEventUB(me0,me1)) 00067 { 00068 LubRanges<View0> ub0(x0); 00069 LubRanges<View1> ub1(x1); 00070 Iter::Ranges::Union<LubRanges<View0>, LubRanges<View1> > u(ub0,ub1); 00071 GECODE_ME_CHECK(x2.intersectI(home,u)); 00072 } 00073 00074 // x1 <= glb(x2)-lub(x0) 00075 // x0 <= glb(x2)-lub(x1) 00076 if (modified || Rel::testSetEventAnyB(me0,me1,me2)) { 00077 { 00078 modified = false; 00079 GlbRanges<View2> lb2(x2); 00080 LubRanges<View0> ub0(x0); 00081 Iter::Ranges::Diff<GlbRanges<View2>, LubRanges<View0> > 00082 diff(lb2,ub0); 00083 GECODE_ME_CHECK_MODIFIED(modified, x1.includeI(home,diff)); 00084 } 00085 { 00086 GlbRanges<View2> lb2(x2); 00087 LubRanges<View1> ub1(x1); 00088 Iter::Ranges::Diff<GlbRanges<View2>, LubRanges<View1> > 00089 diff(lb2,ub1); 00090 GECODE_ME_CHECK_MODIFIED(modified, x0.includeI(home,diff)); 00091 } 00092 } else { 00093 modified = false; 00094 } 00095 00096 // cardinality propagation 00097 if (modified || 00098 Rel::testSetEventCard(me0,me1,me2) || 00099 Rel::testSetEventLB(me0,me1) 00100 ) { 00101 GlbRanges<View0> lb0c(x0); 00102 GlbRanges<View1> lb1c(x1); 00103 Iter::Ranges::Inter<GlbRanges<View0>, GlbRanges<View1> > 00104 inter(lb0c,lb1c); 00105 00106 unsigned int m = Iter::Ranges::size(inter); 00107 00108 if (m < x0.cardMax()+x1.cardMax()) { 00109 GECODE_ME_CHECK_MODIFIED(modified, 00110 x2.cardMax( home, 00111 x0.cardMax()+x1.cardMax() - m ) ); 00112 } 00113 if (m + x2.cardMin() > x1.cardMax()) { 00114 GECODE_ME_CHECK_MODIFIED(modified, 00115 x0.cardMin( home, 00116 m+x2.cardMin()-x1.cardMax() ) ); 00117 } 00118 if (m + x2.cardMin() > x0.cardMax()) { 00119 GECODE_ME_CHECK_MODIFIED(modified, 00120 x1.cardMin( home, 00121 m+x2.cardMin()-x0.cardMax() ) ); 00122 } 00123 } 00124 00125 } while (modified); 00126 00127 if (shared(x0,x1,x2)) { 00128 if (allassigned) { 00129 return home.ES_SUBSUMED(*this); 00130 } else { 00131 return ES_NOFIX; 00132 } 00133 } else { 00134 if (x0.assigned() + x1.assigned() + x2.assigned() >= 2) { 00135 return home.ES_SUBSUMED(*this); 00136 } else { 00137 return ES_FIX; 00138 } 00139 } 00140 00141 } 00142 00143 template<class View0, class View1, class View2> 00144 forceinline 00145 SubOfUnion<View0,View1,View2>::SubOfUnion(Home home, View0 y0, 00146 View1 y1, View2 y2) 00147 : MixTernaryPropagator<View0,PC_SET_ANY,View1,PC_SET_ANY, 00148 View2,PC_SET_ANY>(home,y0,y1,y2) {} 00149 00150 template<class View0, class View1, class View2> 00151 forceinline 00152 SubOfUnion<View0,View1,View2>::SubOfUnion 00153 (Space& home, bool share, SubOfUnion<View0,View1,View2>& p) 00154 : MixTernaryPropagator<View0,PC_SET_ANY,View1,PC_SET_ANY, 00155 View2,PC_SET_ANY>(home,share,p) {} 00156 00157 template<class View0, class View1, class View2> 00158 ExecStatus SubOfUnion<View0,View1,View2>::post 00159 (Home home, View0 x0, View1 x1, View2 x2) { 00160 (void) new (home) SubOfUnion<View0,View1,View2>(home,x0, x1, x2); 00161 return ES_OK; 00162 } 00163 00164 }}} 00165 00166 // STATISTICS: set-prop