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/******************************************************************************
* Top contributors (to current version):
* Andrew Reynolds
*
* This file is part of the cvc5 project.
*
* Copyright (c) 2009-2021 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.
* ****************************************************************************
*
* Branch and bound for arithmetic
*/
#include "cvc5_private.h"
#ifndef CVC5__THEORY__ARITH__BRANCH_AND_BOUND__H
#define CVC5__THEORY__ARITH__BRANCH_AND_BOUND__H
#include <map>
#include "expr/node.h"
#include "proof/proof_node_manager.h"
#include "proof/trust_node.h"
#include "smt/env_obj.h"
#include "theory/arith/arith_state.h"
#include "theory/arith/inference_manager.h"
#include "theory/arith/pp_rewrite_eq.h"
#include "util/rational.h"
namespace cvc5 {
namespace theory {
namespace arith {
/**
* Class is responsible for constructing branch and bound lemmas. It is
* agnostic to the state of solver; instead is simply given (variable, value)
* pairs in branchIntegerVariable below and constructs the appropriate lemma.
*/
class BranchAndBound : protected EnvObj
{
public:
BranchAndBound(Env& env,
ArithState& s,
InferenceManager& im,
PreprocessRewriteEq& ppre,
ProofNodeManager* pnm);
~BranchAndBound() {}
/**
* Branch variable, called when integer var has given value
* in the current model, returns a split to eliminate this model.
*/
TrustNode branchIntegerVariable(TNode var, Rational value);
private:
/** Are proofs enabled? */
bool proofsEnabled() const;
/** Reference to the state */
ArithState& d_astate;
/** Reference to the inference manager */
InferenceManager& d_im;
/** Reference to the preprocess rewriter for equality */
PreprocessRewriteEq& d_ppre;
/** Proof generator. */
std::unique_ptr<EagerProofGenerator> d_pfGen;
/** Proof node manager */
ProofNodeManager* d_pnm;
};
} // namespace arith
} // namespace theory
} // namespace cvc5
#endif
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