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/********************* */
/*! \file model.h
** \verbatim
** Top contributors (to current version):
** Andrew Reynolds, Morgan Deters
** This file is part of the CVC4 project.
** Copyright (c) 2009-2019 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 Model class
**/
#include "cvc4_private.h"
#ifndef CVC4__MODEL_H
#define CVC4__MODEL_H
#include <iosfwd>
#include <vector>
#include "expr/expr.h"
#include "util/cardinality.h"
namespace CVC4 {
class Command;
class SmtEngine;
class Model;
std::ostream& operator<<(std::ostream&, const Model&);
class Model {
friend std::ostream& operator<<(std::ostream&, const Model&);
friend class SmtEngine;
/** the input name (file name, etc.) this model is associated to */
std::string d_inputName;
protected:
/** The SmtEngine we're associated with */
SmtEngine& d_smt;
/** construct the base class; users cannot do this, only CVC4 internals */
Model();
public:
/** virtual destructor */
virtual ~Model() { }
/** get number of commands to report */
size_t getNumCommands() const;
/** get command */
const Command* getCommand(size_t i) const;
/** get the smt engine that this model is hooked up to */
SmtEngine* getSmtEngine() { return &d_smt; }
/** get the smt engine (as a pointer-to-const) that this model is hooked up to */
const SmtEngine* getSmtEngine() const { return &d_smt; }
/** get the input name (file name, etc.) this model is associated to */
std::string getInputName() const { return d_inputName; }
//--------------------------- model cores
/** set using model core
*
* This sets that this model is minimized to be a "model core" for some
* formula (typically the input formula).
*
* For example, given formula ( a>5 OR b>5 ) AND f( c ) = 0,
* a model for this formula is: a -> 6, b -> 0, c -> 0, f -> lambda x. 0.
* A "model core" is a subset of this model that suffices to show the
* above formula is true, for example { a -> 6, f -> lambda x. 0 } is a
* model core for this formula.
*/
virtual void setUsingModelCore() = 0;
/** record model core symbol
*
* This marks that sym is a "model core symbol". In other words, its value is
* critical to the satisfiability of the formula this model is for.
*/
virtual void recordModelCoreSymbol(Expr sym) = 0;
/** Check whether this expr is in the model core */
virtual bool isModelCoreSymbol(Expr expr) const = 0;
//--------------------------- end model cores
/** get value for expression */
virtual Expr getValue(Expr expr) const = 0;
/** get cardinality for sort */
virtual Cardinality getCardinality(Type t) const = 0;
/** print comments */
virtual void getComments(std::ostream& out) const {}
/** get heap model (for separation logic) */
virtual bool getHeapModel( Expr& h, Expr& ne ) const { return false; }
/** are there any approximations in this model? */
virtual bool hasApproximations() const { return false; }
/** get the list of approximations
*
* This is a list of pairs of the form (t,p), where t is a term and p
* is a predicate over t that indicates a property that t satisfies.
*/
virtual std::vector<std::pair<Expr, Expr> > getApproximations() const = 0;
};/* class Model */
class ModelBuilder {
public:
ModelBuilder() { }
virtual ~ModelBuilder() { }
virtual bool buildModel(Model* m) = 0;
};/* class ModelBuilder */
}/* CVC4 namespace */
#endif /* CVC4__MODEL_H */
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