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00043 namespace Gecode { namespace Set { namespace Rel {
00044
00045 template<class View0, class View1>
00046 forceinline
00047 ReEq<View0,View1>::ReEq(Home home, View0 y0, View1 y1,
00048 Gecode::Int::BoolView y2)
00049 : Propagator(home), x0(y0), x1(y1), b(y2) {
00050 b.subscribe(home,*this, Gecode::Int::PC_INT_VAL);
00051 x0.subscribe(home,*this, PC_SET_ANY);
00052 x1.subscribe(home,*this, PC_SET_ANY);
00053 }
00054
00055 template<class View0, class View1>
00056 forceinline
00057 ReEq<View0,View1>::ReEq(Space& home, bool share, ReEq& p)
00058 : Propagator(home,share,p) {
00059 x0.update(home,share,p.x0);
00060 x1.update(home,share,p.x1);
00061 b.update(home,share,p.b);
00062 }
00063
00064 template<class View0, class View1>
00065 PropCost
00066 ReEq<View0,View1>::cost(const Space&, const ModEventDelta&) const {
00067 return PropCost::ternary(PropCost::LO);
00068 }
00069
00070 template<class View0, class View1>
00071 forceinline size_t
00072 ReEq<View0,View1>::dispose(Space& home) {
00073 b.cancel(home,*this, Gecode::Int::PC_INT_VAL);
00074 x0.cancel(home,*this, PC_SET_ANY);
00075 x1.cancel(home,*this, PC_SET_ANY);
00076 (void) Propagator::dispose(home);
00077 return sizeof(*this);
00078 }
00079
00080 template<class View0, class View1>
00081 ExecStatus
00082 ReEq<View0,View1>::post(Home home, View0 x0, View1 x1,
00083 Gecode::Int::BoolView b) {
00084 (void) new (home) ReEq<View0,View1>(home,x0,x1,b);
00085 return ES_OK;
00086 }
00087
00088 template<class View0, class View1>
00089 Actor*
00090 ReEq<View0,View1>::copy(Space& home, bool share) {
00091 return new (home) ReEq<View0,View1>(home,share,*this);
00092 }
00093
00094 template<class View0, class View1>
00095 ExecStatus
00096 ReEq<View0,View1>::propagate(Space& home, const ModEventDelta&) {
00097 if (b.one())
00098 GECODE_REWRITE(*this,(Eq<View0,View1>::post(home(*this),x0,x1)));
00099 if (b.zero())
00100 GECODE_REWRITE(*this,(Distinct<View0,View1>::post(home(*this),x0,x1)));
00101
00102 if (x0.assigned() && x1.assigned()) {
00103
00104 GlbRanges<View0> x0lb(x0);
00105 GlbRanges<View1> x1lb(x1);
00106 for (; x0lb() && x1lb(); ++x0lb, ++x1lb) {
00107 if (x0lb.min() != x1lb.min() ||
00108 x0lb.max() != x1lb.max()) {
00109 GECODE_ME_CHECK(b.zero_none(home));
00110 return home.ES_SUBSUMED(*this);
00111 }
00112 }
00113 if (!x0lb() && !x1lb()) {
00114 GECODE_ME_CHECK(b.one_none(home));
00115 return home.ES_SUBSUMED(*this);
00116 } else {
00117 GECODE_ME_CHECK(b.zero_none(home));
00118 return home.ES_SUBSUMED(*this);
00119 }
00120 }
00121
00122
00123 if (x0.cardMin() > x1.cardMax() ||
00124 x1.cardMin() > x0.cardMax()) {
00125 GECODE_ME_CHECK(b.zero_none(home));
00126 return home.ES_SUBSUMED(*this);
00127 }
00128
00129
00130 GlbRanges<View0> x0lb(x0);
00131 LubRanges<View1> x1ub(x1);
00132 Iter::Ranges::Diff<GlbRanges<View0>, LubRanges<View1> > diff1(x0lb, x1ub);
00133 if ( diff1() ) {
00134 GECODE_ME_CHECK(b.zero_none(home));
00135 return home.ES_SUBSUMED(*this);
00136 }
00137
00138
00139 GlbRanges<View1> x1lb(x1);
00140 LubRanges<View0> x0ub(x0);
00141 Iter::Ranges::Diff<GlbRanges<View1>, LubRanges<View0> > diff2(x1lb, x0ub);
00142 if ( diff2() ) {
00143 GECODE_ME_CHECK(b.zero_none(home));
00144 return home.ES_SUBSUMED(*this);
00145 }
00146
00147 return ES_FIX;
00148 }
00149
00150 }}}
00151
00152