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Simplify clause_builder

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This commit is contained in:
Jakob Rath 2022-10-07 15:22:49 +02:00
parent e18bc46de1
commit 8b4a36e3bd
4 changed files with 8 additions and 20 deletions
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11
src/math/polysat/clause_builder.h
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@ -12,9 +12,7 @@ Author:
Notes:
Builds a clause from literals and constraints.
Takes care to
- resolve with unit clauses and accumulate their dependencies,
- skip trivial new constraints such as "4 <= 1".
Skips trivial new constraints such as "4 <= 1".
--*/
#pragma once
@ -26,7 +24,7 @@ namespace polysat {
class clause_builder {
solver* m_solver;
sat::literal_vector m_literals;
/// true iff clause contains a literal that is always true
/// 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;
@ -40,19 +38,14 @@ namespace polysat {
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();
void push(sat::literal lit);
void push(signed_constraint c);
void push(inequality const& i) { push(i.as_signed_constraint()); }
/// Push a new constraint. Allocates a boolean variable for the constraint, if necessary.
void push_new(signed_constraint c);
using const_iterator = decltype(m_literals)::const_iterator;
const_iterator begin() const { return m_literals.begin(); }
const_iterator end() const { return m_literals.end(); }