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Updated user-propagator example (#5879)

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Clemens Eisenhofer 2022-03-03 19:42:06 +01:00 • committed by GitHub
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commit 35fb95648b
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examples/userPropagator/user_propagator_internal_maximisation.h Normal file
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#pragma once
#include "user_propagator_with_theory.h"
class user_propagator_internal_maximisation : public user_propagator_with_theory {
z3::expr manhattanSum;
public:
int best = -1;
user_propagator_internal_maximisation(z3::solver *s, std::unordered_map<z3::expr, unsigned> &idMapping, unsigned board, z3::expr_vector queens)
: user_propagator_with_theory(s, idMapping, board),
manhattanSum(s->ctx().bv_val(0, queens[0].get_sort().bv_size())) {
for (int i = 1; i < queens.size(); i++) {
manhattanSum = manhattanSum + z3::ite(z3::uge(queens[i], queens[i - 1]), queens[i] - queens[i - 1], queens[i - 1] - queens[i]);
}
}
void final() override {
int current = 0;
for (unsigned i = 1; i < board; i++) {
current += abs((signed) currentModel[i] - (signed) currentModel[i - 1]);
}
best = std::max(current, best);
this->propagate(z3::expr_vector(ctx()), z3::ugt(manhattanSum, best));
}
};