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clause_builder should not fail on always-true literals

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Otherwise, e.g. when adding axioms, the caller would have to check each literal before adding it.
This commit is contained in:
Jakob Rath 2022-01-18 10:22:24 +01:00
parent ebc4df1ece
commit e005838129
5 changed files with 21 additions and 4 deletions
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6
src/math/polysat/clause_builder.h
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@ -26,6 +26,9 @@ namespace polysat {
class clause_builder {
solver* m_solver;
sat::literal_vector m_literals;
/// true iff clause contains a literal that is always true
/// (only this specific case of tautology is covered by this flag)
bool m_is_tautology = false;
public:
clause_builder(solver& s);
@ -34,11 +37,12 @@ namespace polysat {
clause_builder& operator=(clause_builder const& s) = delete;
clause_builder& operator=(clause_builder&& s) = default;
bool empty() const { return m_literals.empty(); }
bool empty() const { return m_literals.empty() && !m_is_tautology; }
void reset();
/// Build the clause. This will reset the clause builder so it can be reused.
/// Returns nullptr if the clause is a tautology and should not be added to the solver.
clause_ref build();