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/********************* */
/*! \file skolem_cache.h
** \verbatim
** Top contributors (to current version):
** Andrew Reynolds
** This file is part of the CVC4 project.
** Copyright (c) 2009-2020 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 Arrays skolem cache
**/
#include "cvc4_private.h"
#ifndef CVC4__THEORY__ARRAYS__SKOLEM_CACHE_H
#define CVC4__THEORY__ARRAYS__SKOLEM_CACHE_H
#include "expr/node.h"
namespace CVC4 {
namespace theory {
namespace arrays {
/**
* The arrays skolem cache, which provides static methods for constructing
* skolems with witness forms.
*/
class SkolemCache
{
public:
SkolemCache();
~SkolemCache() {}
/**
* Get the skolem correspoding to the index that witnesses the disequality
* deq between arrays a and b. The witness form of this skolem is:
* (witness ((x T)) (=> (not (= a b)) (not (= (select a x) (select b x)))))
* This skolem is unique for deq, calling this method will always return the
* same skolem over the lifetime of deq.
*/
static Node getExtIndexSkolem(Node deq);
private:
/**
* Get the bound variable x of the witness term above for disequality deq
* between arrays.
*/
static Node getExtIndexVar(Node deq);
};
} // namespace arrays
} // namespace theory
} // namespace CVC4
#endif
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