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https://github.com/Z3Prover/z3
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0c1e44da77
* Assign boolean variables only to long-lived constraints, and deduplicate constraints when they are created * scoped_signed_constraint * update other classes * fix * Don't use scoped_ptr<constraint> with dedup()
53 lines
1.4 KiB
C++
53 lines
1.4 KiB
C++
/*++
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Copyright (c) 2021 Microsoft Corporation
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Module Name:
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polysat clause builder
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Author:
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Jakob Rath 2021-04-6
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Notes:
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Builds a clause from literals and constraints.
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Takes care to
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- resolve with unit clauses and accumulate their dependencies,
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- skip trivial new constraints such as "4 <= 1".
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--*/
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#pragma once
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#include "math/polysat/constraint.h"
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#include "math/polysat/types.h"
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namespace polysat {
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// TODO: this is now incorporated in conflict_core
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class clause_builder {
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solver& m_solver;
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sat::literal_vector m_literals;
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scoped_ptr_vector<constraint> m_new_constraints;
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p_dependency_ref m_dep;
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unsigned m_level = 0;
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public:
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clause_builder(solver& s);
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bool empty() const { return m_literals.empty() && m_new_constraints.empty() && m_dep == nullptr && m_level == 0; }
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void reset();
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/// Build the clause. This will reset the clause builder so it can be reused.
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clause_ref build();
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void add_dependency(p_dependency* d);
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/// Add a literal to the clause.
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/// Intended to be used for literals representing a constraint that already exists.
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void push_literal(sat::literal lit);
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/// Add a constraint to the clause that does not yet exist in the solver so far.
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void push_new_constraint(scoped_signed_constraint c);
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};
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}
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