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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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* Branch and bound for arithmetic |
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*/ |
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#include "cvc5_private.h" |
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#ifndef CVC5__THEORY__ARITH__BRANCH_AND_BOUND__H |
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#define CVC5__THEORY__ARITH__BRANCH_AND_BOUND__H |
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#include <map> |
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#include "expr/node.h" |
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#include "proof/proof_node_manager.h" |
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#include "proof/trust_node.h" |
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#include "smt/env_obj.h" |
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#include "theory/arith/arith_state.h" |
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#include "theory/arith/inference_manager.h" |
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#include "theory/arith/pp_rewrite_eq.h" |
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#include "util/rational.h" |
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namespace cvc5 { |
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namespace theory { |
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namespace arith { |
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/** |
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* Class is responsible for constructing branch and bound lemmas. It is |
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* agnostic to the state of solver; instead is simply given (variable, value) |
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* pairs in branchIntegerVariable below and constructs the appropriate lemma. |
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*/ |
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class BranchAndBound : protected EnvObj |
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{ |
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public: |
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BranchAndBound(Env& env, |
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ArithState& s, |
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InferenceManager& im, |
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PreprocessRewriteEq& ppre, |
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ProofNodeManager* pnm); |
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~BranchAndBound() {} |
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/** |
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* Branch variable, called when integer var has given value |
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* in the current model, returns a split to eliminate this model. |
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*/ |
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TrustNode branchIntegerVariable(TNode var, Rational value); |
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private: |
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/** Are proofs enabled? */ |
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bool proofsEnabled() const; |
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/** Reference to the state */ |
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ArithState& d_astate; |
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/** Reference to the inference manager */ |
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InferenceManager& d_im; |
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/** Reference to the preprocess rewriter for equality */ |
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PreprocessRewriteEq& d_ppre; |
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/** Proof generator. */ |
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std::unique_ptr<EagerProofGenerator> d_pfGen; |
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/** Proof node manager */ |
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ProofNodeManager* d_pnm; |
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}; |
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} // namespace arith |
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} // namespace theory |
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} // namespace cvc5 |
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#endif |