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/********************* */
/*! \file decision_strategy.h
** \verbatim
** Top contributors (to current version):
** Kshitij Bansal, Morgan Deters, Tim King
** This file is part of the CVC4 project.
** Copyright (c) 2009-2016 by the authors listed in the file AUTHORS
** in the top-level source directory) and their institutional affiliations.
** All rights reserved. See the file COPYING in the top-level source
** directory for licensing information.\endverbatim
**
** \brief Decision strategy
**
** Decision strategy
**/
#include "cvc4_private.h"
#ifndef __CVC4__DECISION__DECISION_STRATEGY_H
#define __CVC4__DECISION__DECISION_STRATEGY_H
#include "prop/sat_solver_types.h"
#include "smt/ite_removal.h"
namespace CVC4 {
class DecisionEngine;
namespace context {
class Context;
}/* CVC4::context namespace */
namespace decision {
class DecisionStrategy {
protected:
DecisionEngine* d_decisionEngine;
public:
DecisionStrategy(DecisionEngine* de, context::Context *c) :
d_decisionEngine(de) {
}
virtual ~DecisionStrategy() { }
virtual prop::SatLiteral getNext(bool&) = 0;
virtual bool needIteSkolemMap() { return false; }
virtual void notifyAssertionsAvailable() { return; }
};/* class DecisionStrategy */
class ITEDecisionStrategy : public DecisionStrategy {
public:
ITEDecisionStrategy(DecisionEngine* de, context::Context *c) :
DecisionStrategy(de, c) {
}
bool needIteSkolemMap() { return true; }
virtual void addAssertions(const std::vector<Node> &assertions,
unsigned assertionsEnd,
IteSkolemMap iteSkolemMap) = 0;
};/* class ITEDecisionStrategy */
class RelevancyStrategy : public ITEDecisionStrategy {
public:
RelevancyStrategy(DecisionEngine* de, context::Context *c) :
ITEDecisionStrategy(de, c) {
}
virtual bool isRelevant(TNode n) = 0;
virtual prop::SatValue getPolarity(TNode n) = 0;
};/* class RelevancyStrategy */
}/* CVC4::decision namespace */
}/* CVC4 namespace */
#endif /* __CVC4__DECISION__DECISION_STRATEGY_H */
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