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/********************* */
/*! \file decision_engine.h
** \verbatim
** Original author: mdeters
** Major contributors: none
** Minor contributors (to current version): none
** This file is part of the CVC4 prototype.
** Copyright (c) 2009, 2010 The Analysis of Computer Systems Group (ACSys)
** Courant Institute of Mathematical Sciences
** New York University
** See the file COPYING in the top-level source directory for licensing
** information.\endverbatim
**
** \brief A decision engine for CVC4.
**
** A decision engine for CVC4.
**/
#include "cvc4_private.h"
#ifndef __CVC4__DECISION_ENGINE_H
#define __CVC4__DECISION_ENGINE_H
#include "expr/node.h"
namespace CVC4 {
// In terms of abstraction, this is below (and provides services to)
// PropEngine.
/**
* A decision mechanism for the next decision.
*/
class DecisionEngine {
public:
/**
* Destructor.
*/
virtual ~DecisionEngine();
/**
* Get the next decision.
*/
virtual Node nextDecision();// = 0
/**
* This is called by SmtEngine, at shutdown time, just before
* destruction. It is important because there are destruction
* ordering issues between some parts of the system. For now,
* there's nothing to do here in the DecisionEngine.
*/
virtual void shutdown() {
}
// TODO: design decision: decision engine should be notified of
// propagated lits, and also why(?) (so that it can make decisions
// based on the utility of various theories and various theory
// literals). How? Maybe TheoryEngine has a backdoor into
// DecisionEngine "behind the back" of the PropEngine?
};/* class DecisionEngine */
}/* CVC4 namespace */
#endif /* __CVC4__DECISION_ENGINE_H */
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