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/********************* */
/*! \file infer_info.h
** \verbatim
** Top contributors (to current version):
** Mudathir Mohamed
** 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 Inference information utility
**/
#include "cvc4_private.h"
#ifndef CVC4__THEORY__BAGS__INFER_INFO_H
#define CVC4__THEORY__BAGS__INFER_INFO_H
#include <map>
#include <vector>
#include "expr/node.h"
#include "theory/theory_inference.h"
namespace CVC4 {
namespace theory {
namespace bags {
/**
* Types of inferences used in the procedure
*/
enum class Inference : uint32_t
{
NONE,
BAG_NON_NEGATIVE_COUNT,
BAG_MK_BAG_SAME_ELEMENT,
BAG_MK_BAG,
BAG_EQUALITY,
BAG_DISEQUALITY,
BAG_EMPTY,
BAG_UNION_DISJOINT,
BAG_UNION_MAX,
BAG_INTERSECTION_MIN,
BAG_DIFFERENCE_SUBTRACT,
BAG_DIFFERENCE_REMOVE,
BAG_DUPLICATE_REMOVAL
};
/**
* Converts an inference to a string. Note: This function is also used in
* `safe_print()`. Changing this functions name or signature will result in
* `safe_print()` printing "<unsupported>" instead of the proper strings for
* the enum values.
*
* @param i The inference
* @return The name of the inference
*/
const char* toString(Inference i);
/**
* Writes an inference name to a stream.
*
* @param out The stream to write to
* @param i The inference to write to the stream
* @return The stream
*/
std::ostream& operator<<(std::ostream& out, Inference i);
class InferenceManager;
/**
* An inference. This is a class to track an unprocessed call to either
* send a fact, lemma, or conflict that is waiting to be asserted to the
* equality engine or sent on the output channel.
*/
class InferInfo : public TheoryInference
{
public:
InferInfo();
~InferInfo() {}
/** Process this inference */
bool process(TheoryInferenceManager* im, bool asLemma) override;
/** The inference identifier */
Inference d_id;
/** The conclusions */
Node d_conclusion;
/**
* The premise(s) of the inference, interpreted conjunctively. These are
* literals that currently hold in the equality engine.
*/
std::vector<Node> d_premises;
/**
* A map of nodes to their skolem variables introduced as a result of this
* inference.
*/
std::map<Node, Node> d_skolems;
/** Is this infer info trivial? True if d_conc is true. */
bool isTrivial() const;
/**
* Does this infer info correspond to a conflict? True if d_conc is false
* and it has no new premises (d_noExplain).
*/
bool isConflict() const;
/**
* Does this infer info correspond to a "fact". A fact is an inference whose
* conclusion should be added as an equality or predicate to the equality
* engine with no new external premises (d_noExplain).
*/
bool isFact() const;
};
/**
* Writes an inference info to a stream.
*
* @param out The stream to write to
* @param ii The inference info to write to the stream
* @return The stream
*/
std::ostream& operator<<(std::ostream& out, const InferInfo& ii);
} // namespace bags
} // namespace theory
} // namespace CVC4
#endif /* CVC4__THEORY__BAGS__INFER_INFO_H */
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