range.hpp
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00038 #include <gecode/int/rel.hh>
00039
00040 namespace Gecode { namespace Int { namespace Dom {
00041
00042 template<class View>
00043 forceinline
00044 ReRange<View>::ReRange(Home home, View x, int min0, int max0, BoolView b)
00045 : ReUnaryPropagator<View,PC_INT_BND,BoolView>(home,x,b),
00046 min(min0), max(max0) {}
00047
00048 template<class View>
00049 ExecStatus
00050 ReRange<View>::post(Home home, View x, int min, int max, BoolView b) {
00051 if (min > max) {
00052 return ES_FAILED;
00053 } else if (min == max) {
00054 return Rel::ReEqDomInt<View,BoolView>::post(home,x,min,b);
00055 } else if ((max < x.min()) || (min > x.max())) {
00056 GECODE_ME_CHECK(b.zero(home));
00057 } else if ((min <= x.min()) && (x.max() <= max)) {
00058 GECODE_ME_CHECK(b.one(home));
00059 } else {
00060 (void) new (home) ReRange<View>(home,x,min,max,b);
00061 }
00062 return ES_OK;
00063 }
00064
00065
00066 template<class View>
00067 forceinline
00068 ReRange<View>::ReRange(Space& home, bool share, ReRange& p)
00069 : ReUnaryPropagator<View,PC_INT_BND,BoolView>(home,share,p),
00070 min(p.min), max(p.max) {}
00071
00072 template<class View>
00073 Actor*
00074 ReRange<View>::copy(Space& home, bool share) {
00075 return new (home) ReRange<View>(home,share,*this);
00076 }
00077
00078 template<class View>
00079 ExecStatus
00080 ReRange<View>::propagate(Space& home, const ModEventDelta&) {
00081 if (b.one()) {
00082 GECODE_ME_CHECK(x0.gq(home,min));
00083 GECODE_ME_CHECK(x0.lq(home,max));
00084 goto subsumed;
00085 }
00086 if (b.zero()) {
00087 Iter::Ranges::Singleton r(min,max);
00088 GECODE_ME_CHECK(x0.minus_r(home,r,false));
00089 goto subsumed;
00090 }
00091 if ((x0.max() <= max) && (x0.min() >= min)) {
00092 GECODE_ME_CHECK(b.one_none(home)); goto subsumed;
00093 }
00094 if ((x0.max() < min) || (x0.min() > max)) {
00095 GECODE_ME_CHECK(b.zero_none(home)); goto subsumed;
00096 }
00097 return ES_FIX;
00098 subsumed:
00099 x0.cancel(home,*this,PC_INT_BND);
00100 return ES_SUBSUMED(*this,sizeof(*this));
00101 }
00102
00103
00104 }}}
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