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remove auxiliary variables from weighted maxsat

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2013-12-16 11:42:28 +02:00
parent 1ca44ed316
commit 1bcf5b8b5f
1 changed files with 8 additions and 3 deletions
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11
src/opt/weighted_maxsat.cpp
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@ -24,6 +24,7 @@ Notes:
namespace smt {
class theory_weighted_maxsat : public theory {
opt::opt_solver& s;
app_ref_vector m_vars; // Auxiliary variables per soft clause
expr_ref_vector m_fmls; // Formulas per soft clause
app_ref m_min_cost_atom; // atom tracking modified lower bound
@ -35,9 +36,11 @@ namespace smt {
rational m_min_cost; // current maximal cost assignment.
u_map<theory_var> m_bool2var; // bool_var -> theory_var
svector<bool_var> m_var2bool; // theory_var -> bool_var
public:
theory_weighted_maxsat(ast_manager& m):
theory_weighted_maxsat(ast_manager& m, opt::opt_solver& s):
theory(m.mk_family_id("weighted_maxsat")),
s(s),
m_vars(m),
m_fmls(m),
m_min_cost_atom(m)
@ -132,6 +135,7 @@ namespace smt {
ast_manager& m = get_manager();
app_ref var(m), wfml(m);
var = m.mk_fresh_const("w", m.mk_bool_sort());
s.mc().insert(var->get_decl());
wfml = m.mk_or(var, fml);
ctx.assert_expr(wfml);
m_weights.push_back(w);
@ -150,6 +154,7 @@ namespace smt {
strm << "cost <= " << c;
m_min_cost = c;
m_min_cost_atom = m.mk_fresh_const(strm.str().c_str(), m.mk_bool_sort());
s.mc().insert(m_min_cost_atom->get_decl());
return m_min_cost_atom;
}
@ -203,7 +208,7 @@ namespace smt {
m_min_cost_atom = 0;
}
virtual theory * mk_fresh(context * new_ctx) { return alloc(theory_weighted_maxsat, new_ctx->get_manager()); }
virtual theory * mk_fresh(context * new_ctx) { return 0; }
virtual bool internalize_atom(app * atom, bool gate_ctx) { return false; }
virtual bool internalize_term(app * term) { return false; }
virtual void new_eq_eh(theory_var v1, theory_var v2) { }
@ -363,7 +368,7 @@ namespace opt {
wth->reset();
}
else {
wth = alloc(smt::theory_weighted_maxsat, m);
wth = alloc(smt::theory_weighted_maxsat, m, s);
s.get_context().register_plugin(wth);
}
return *wth;