Jip J. Dekker
35a3110598
git-subtree-dir: software/chuffed git-subtree-split: 2ed0c01558d2a5c49c1ce57e048d32c17adf92d3
57 lines
1.1 KiB
C++
57 lines
1.1 KiB
C++
#include <chuffed/core/propagator.h>
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#include <chuffed/vars/modelling.h>
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void var_sym_break(vec<IntVar*>& x) {
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for (int i = 0; i < x.size()-1; i++) {
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int_rel(x[i], IRT_LE, x[i+1]);
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}
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}
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// (x = k /\ y = k) || (x < y)
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class BinLTInf : public Propagator {
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IntView<0> x;
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IntView<0> y;
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int k;
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public:
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BinLTInf(IntVar *_x, IntVar *_y, int _k) : x(_x), y(_y), k(_k) {
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x.attach(this, 0, EVENT_L);
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y.attach(this, 1, EVENT_U);
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}
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bool propagate() {
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if (y.getMax() < k) {
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int64_t m = y.getMax()-1;
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setDom(x, setMax, m, y.getMaxLit());
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}
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int64_t m = x.getMin()+1;
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if (m > k) m = k;
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setDom(y, setMin, m, x.getMinLit());
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return true;
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}
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};
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void val_sym_break(vec<IntVar*>& x, int l, int u) {
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vec<IntVar*> y;
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createVars(y, u-l+1, 0, x.size(), true);
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for (int i = 0; i < x.size(); i++) {
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x[i]->specialiseToEL();
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}
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for (int i = l; i <= u; i++) {
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for (int j = 0; j < x.size(); j++) {
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bool_rel(y[i-l]->getLit(j,1), BRT_R_IMPL, x[j]->getLit(i,1));
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bool_rel(x[j]->getLit(i,1), BRT_R_IMPL, y[i-l]->getLit(j,3));
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}
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}
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for (int i = 0; i < u-l; i++) {
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new BinLTInf(y[i], y[i+1], x.size());
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}
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}
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