Esempio n. 1
0
bool ExternalKnowledge::PostPropagator::propagate(Clasp::Solver &s) {
	if(ext_->poll()) {
		std::cerr << "Stopping solver..." << std::endl;
		s.setStopConflict();
	}

	if(s.hasConflict())	{
		assert(s.hasConflict());
		return false;
	}
	return true;
}
Esempio n. 2
0
bool TheoryPropagator::PP::propagateFixpoint(Clasp::Solver& s, Clasp::PostPropagator*) {
	typedef Potassco::AbstractPropagator::ChangeList ChangeList;
	while (delta_ != trail_.size()) {
		uint32 dl = s.decisionLevel();
		if (undo_.back().level != dl) {
			s.addUndoWatch(dl, this);
			undo_.push_back(Undo(dl, delta_));
		}
		ChangeList change = Potassco::toSpan(&trail_[0] + delta_, trail_.size() - delta_);
		delta_  = trail_.size();
		status_ = ClauseCreator::status_open;
		solver_ = &s;
		inProp_ = true;
		bool ok = wrapper_->prop_->propagate(*this, change);
		inProp_ = false;
		if (!ok && !s.hasConflict() && (status_ & ClauseCreator::status_asserting) != 0) {
			if (s.level(clause_[1].var()) < dl && dl != s.backtrackLevel()) {
				TheoryPropagator::PP::reset();
				for (PostPropagator* n = this->next; n; n = n->next) { n->reset(); }
				dl = s.undoUntil(s.level(clause_[1].var()));
			}
			if (!s.isFalse(clause_[0])) {
				ok = ClauseCreator::create(*solver_, clause_, ccFlags_s | ClauseCreator::clause_no_prepare, Constraint_t::Other);
			}
			else {
				return s.force(clause_[0], this);
			}
		}
		if (s.hasConflict() || !ok || (s.queueSize() && !s.propagateUntil(this))) {
			if (!s.hasConflict()) { s.setStopConflict(); }
			return false;
		}
		CLASP_FAIL_IF(dl < s.decisionLevel(), "invalid operation in propagation");
	}
	return true;
}