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avoid a crash in maximize_term when the term var has not been used

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Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2018-06-29 13:33:31 -07:00
parent d80f6e3222
commit f2e878047d
1 changed files with 6 additions and 1 deletions
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7
src/util/lp/lar_solver.cpp
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@ -504,7 +504,8 @@ lar_term lar_solver::get_term_to_maximize(unsigned ext_j) const {
r. add_monomial(one_of_type<mpq>(), local_j);
return r;
}
if (!is_term(ext_j) || adjust_term_index(ext_j) >= m_terms.size())
return lar_term(); // return an empty term
return get_term(ext_j);
}
@ -513,6 +514,10 @@ lp_status lar_solver::maximize_term(unsigned ext_j,
bool was_feasible = m_mpq_lar_core_solver.m_r_solver.calc_current_x_is_feasible_include_non_basis();
impq prev_value;
lar_term term = get_term_to_maximize(ext_j);
if (term.is_empty()) {
return lp_status::UNBOUNDED;
}
auto backup = m_mpq_lar_core_solver.m_r_x;
if (was_feasible) {
prev_value = term.apply(m_mpq_lar_core_solver.m_r_x);