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adding watches on Booleans

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2021-09-16 22:01:34 +01:00
parent c25fd71bf4
commit f01da40e49
7 changed files with 130 additions and 54 deletions
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16
src/math/polysat/boolean.h
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@ -19,14 +19,17 @@ namespace polysat {
class clause;
class bool_var_manager {
svector<sat::bool_var> m_unused; // previously deleted variables that can be reused by new_var();
svector<lbool> m_value; // current value (indexed by literal)
svector<unsigned> m_level; // level of assignment (indexed by variable)
svector<clause*> m_reason; // propagation reason, NULL for decisions (indexed by variable)
svector<sat::bool_var> m_unused; // previously deleted variables that can be reused by new_var();
svector<lbool> m_value; // current value (indexed by literal)
svector<unsigned> m_level; // level of assignment (indexed by variable)
unsigned_vector m_activity; //
svector<clause*> m_reason; // propagation reason, NULL for decisions (indexed by variable)
// For enumerative backtracking we store the lemma we're handling with a certain decision
svector<clause*> m_lemma;
vector<ptr_vector<clause>> m_watch; // watch list for literals into clauses
public:
// allocated size (not the number of active variables)
unsigned size() const { return m_level.size(); }
@ -41,12 +44,17 @@ namespace polysat {
bool is_propagation(sat::bool_var var) const { return is_assigned(var) && reason(var); }
lbool value(sat::bool_var var) const { return value(sat::literal(var)); }
lbool value(sat::literal lit) const { return m_value[lit.index()]; }
bool is_true(sat::literal lit) const { return value(lit) == l_true; }
bool is_false(sat::literal lit) const { return value(lit) == l_false; }
unsigned level(sat::bool_var var) const { SASSERT(is_assigned(var)); return m_level[var]; }
unsigned level(sat::literal lit) const { return level(lit.var()); }
clause* reason(sat::bool_var var) const { SASSERT(is_assigned(var)); return m_reason[var]; }
clause* lemma(sat::bool_var var) const { SASSERT(is_decision(var)); return m_lemma[var]; }
ptr_vector<clause>& watch(sat::literal lit) { return m_watch[lit.index()]; }
unsigned_vector& activity() { return m_activity; }
/// Set the given literal to true
void assign(sat::literal lit, unsigned lvl, clause* reason, clause* lemma);
void unassign(sat::literal lit);