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/********************* */
/*! \file fun_def_evaluator.h
** \verbatim
** Top contributors (to current version):
** Andrew Reynolds
** This file is part of the CVC4 project.
** Copyright (c) 2009-2021 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 Techniques for evaluating terms with recursively defined functions.
**/
#include "cvc4_private.h"
#ifndef CVC4__QUANTIFIERS_FUN_DEF_EVALUATOR_H
#define CVC4__QUANTIFIERS_FUN_DEF_EVALUATOR_H
#include <map>
#include <vector>
#include "expr/node.h"
#include "theory/evaluator.h"
namespace CVC5 {
namespace theory {
namespace quantifiers {
/**
* Techniques for evaluating recursively defined functions.
*/
class FunDefEvaluator
{
public:
FunDefEvaluator();
~FunDefEvaluator() {}
/**
* Assert definition of a (recursive) function definition given by quantified
* formula q.
*/
void assertDefinition(Node q);
/**
* Simplify node based on the (recursive) function definitions known by this
* class. If n cannot be simplified to a constant, then this method returns
* null.
*/
Node evaluate(Node n) const;
/**
* Has a call to assertDefinition been made? If this returns false, then
* the evaluate method is the same as calling the rewriter, and returning
* false if the result is non-constant.
*/
bool hasDefinitions() const;
private:
/** information cached per function definition */
class FunDefInfo
{
public:
/** the body */
Node d_body;
/** the formal argument list */
std::vector<Node> d_args;
};
/** maps functions to the above information */
std::map<Node, FunDefInfo> d_funDefMap;
/** evaluator utility */
Evaluator d_eval;
};
} // namespace quantifiers
} // namespace theory
} // namespace CVC5
#endif
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