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/*
* This file is part of the source code of the software program
* Vampire. It is protected by applicable
* copyright laws.
*
* This source code is distributed under the licence found here
* https://vprover.github.io/license.html
* and in the source directory
*/
/**
* @file ExtensionalityResolution.hpp
* Defines class ExtensionalityResolution
*
*/
#ifndef __ExtensionalityResolution__
#define __ExtensionalityResolution__
#include "Forwards.hpp"
#include "InferenceEngine.hpp"
namespace Inferences
{
using namespace Kernel;
/* NOTE / TODO:
* the ExtensionalityResolution rule has not yet been updated
* to fully capitalize on vampire's support for polymorphism.
* In particular, opportunities to apply the rule are detected
* based on sort equality rather then sort unifyability.
* See, e.g. NegEqSortFn (for BackwardPairingFn),
* ExtensionalityClauseContainer::activeIterator (for ForwardPairingFn).
**/
class ExtensionalityResolution
: public GeneratingInferenceEngine
{
public:
ClauseIterator generateClauses(Clause* premise) override;
static Clause* performExtensionalityResolution(
Clause* extCl, Literal* extLit,
Clause* otherCl, Literal* otherLit,
RobSubstitution* subst,
const Options& opts);
private:
struct ForwardPairingFn;
struct ForwardUnificationsFn;
struct ForwardResultFn;
struct NegEqSortFn;
struct BackwardPairingFn;
struct BackwardUnificationsFn;
struct BackwardResultFn;
};
};
#endif /*__ExtensionalityResolution__*/