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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds |
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* |
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* This file is part of the cvc5 project. |
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* |
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* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS |
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* in the top-level source directory and their institutional affiliations. |
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* All rights reserved. See the file COPYING in the top-level source |
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* directory for licensing information. |
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* **************************************************************************** |
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* |
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* Learned literal manager |
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*/ |
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#include "cvc5_private.h" |
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#ifndef CVC5__PREPROCESSING__LEARNED_LITERAL_MANAGER_H |
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#define CVC5__PREPROCESSING__LEARNED_LITERAL_MANAGER_H |
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#include "context/cdhashset.h" |
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#include "expr/node.h" |
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#include "smt/env_obj.h" |
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namespace cvc5 { |
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namespace preprocessing { |
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/** |
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* This class maintains the list of learned literals that have been inferred |
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* during preprocessing but we have not fully processed e.g. via substitutions. |
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* |
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* In particular, notice that if an equality (= x t) is learned at top level, |
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* we may add x -> t to top level substitutions if t does not contain x; we can |
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* henceforth forget that (= x t) is a learned literal. On the other hand, if |
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* a literal like (> x t) is learned at top-level, it may be useful to remember |
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* this information. This class is concerned with the latter kind of literals. |
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*/ |
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class LearnedLiteralManager : protected EnvObj |
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{ |
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public: |
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LearnedLiteralManager(Env& env); |
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/** |
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* Notify learned literal. This method is called when a literal is |
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* entailed by the current set of assertions. |
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* |
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* It should be rewritten, and such that top level substitutions have |
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* been applied to it. |
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*/ |
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void notifyLearnedLiteral(TNode lit); |
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/** |
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* Get learned literals, which returns the current set of learned literals |
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* provided to this class. These literals are refreshed so that the current |
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* top-level substitutions are applied to them, and then are rewritten. |
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*/ |
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std::vector<Node> getLearnedLiterals() const; |
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private: |
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/** Learned literal map */ |
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typedef context::CDHashSet<Node> NodeSet; |
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/** Learned literals */ |
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NodeSet d_learnedLits; |
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}; |
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} // namespace preprocessing |
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} // namespace cvc5 |
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#endif /* CVC5__PREPROCESSING__LEARNED_LITERAL_MANAGER_H */ |