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/********************* */
/*! \file inst_match.h
** \verbatim
** Top contributors (to current version):
** Andrew Reynolds, Morgan Deters, Francois Bobot
** This file is part of the CVC4 project.
** Copyright (c) 2009-2017 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 inst match class
**/
#include "cvc4_private.h"
#ifndef __CVC4__THEORY__QUANTIFIERS__INST_MATCH_H
#define __CVC4__THEORY__QUANTIFIERS__INST_MATCH_H
#include <vector>
#include "expr/node.h"
namespace CVC4 {
namespace theory {
class EqualityQuery;
namespace inst {
/** Inst match
*
* This is the basic class specifying an instantiation. Its domain size (the
* size of d_vals) is the number of bound variables of the quantified formula
* that is passed to its constructor.
*
* The values of d_vals may be null, which indicate that the field has
* yet to be initialized.
*/
class InstMatch {
public:
InstMatch(){}
explicit InstMatch(TNode q);
InstMatch( InstMatch* m );
/* map from variable to ground terms */
std::vector<Node> d_vals;
/** add match m
*
* This adds the initialized fields of m to this match for each field that is
* not already initialized in this match.
*/
void add(InstMatch& m);
/** merge with match m
*
* This method returns true if the merge was successful, that is, all jointly
* initialized fields of this class and m are equivalent modulo the equalities
* given by q.
*/
bool merge( EqualityQuery* q, InstMatch& m );
/** is this complete, i.e. are all fields non-null? */
bool isComplete();
/** is this empty, i.e. are all fields the null node? */
bool empty();
/** clear the instantiation, i.e. set all fields to the null node */
void clear();
/** debug print method */
void debugPrint(const char* c);
/** to stream */
inline void toStream(std::ostream& out) const {
out << "INST_MATCH( ";
bool printed = false;
for( unsigned i=0; i<d_vals.size(); i++ ){
if( !d_vals[i].isNull() ){
if( printed ){ out << ", "; }
out << i << " -> " << d_vals[i];
printed = true;
}
}
out << " )";
}
/** get the i^th term in the instantiation */
Node get(int i) const;
/** append the terms of this instantiation to inst */
void getInst(std::vector<Node>& inst) const;
/** set/overwrites the i^th field in the instantiation with n */
void setValue( int i, TNode n );
/** set the i^th term in the instantiation to n
*
* This method returns true if the i^th field was previously uninitialized,
* or is equivalent to n modulo the equalities given by q.
*/
bool set(EqualityQuery* q, int i, TNode n);
};
inline std::ostream& operator<<(std::ostream& out, const InstMatch& m) {
m.toStream(out);
return out;
}
}/* CVC4::theory::inst namespace */
typedef CVC4::theory::inst::InstMatch InstMatch;
}/* CVC4::theory namespace */
}/* CVC4 namespace */
#endif /* __CVC4__THEORY__QUANTIFIERS__INST_MATCH_H */
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