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fix #3121

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-03-03 12:59:14 -08:00
parent 2989d9c241
commit b8f076a072
1 changed files with 24 additions and 1 deletions
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25
src/smt/theory_lra.cpp
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@ -3087,6 +3087,28 @@ public:
bool set_lower_bound(lpvar vi, lp::constraint_index ci, rational const& v) { return set_bound(vi, ci, v, true); }
vector<constraint_bound> m_history;
template<typename Ctx, typename T, bool CallDestructors=true>
class history_trail : public trail<Ctx> {
vector<T, CallDestructors> & m_dst;
unsigned m_idx;
vector<T, CallDestructors> & m_hist;
public:
history_trail(vector<T, CallDestructors> & v, unsigned idx, vector<T, CallDestructors> & hist):
m_dst(v),
m_idx(idx),
m_hist(hist) {}
~history_trail() override {
}
void undo(Ctx & ctx) override {
m_dst[m_idx] = m_hist.back();
m_hist.pop_back();
}
};
bool set_bound(lpvar vi, lp::constraint_index ci, rational const& v, bool is_lower) {
if (lp().is_term(vi)) {
@ -3098,7 +3120,8 @@ public:
constraint_bound& b = vec[ti];
if (b.first == UINT_MAX || (is_lower? b.second < v : b.second > v)) {
TRACE("arith", tout << "tighter bound " << vi << "\n";);
ctx().push_trail(vector_value_trail<context, constraint_bound>(vec, ti));
m_history.push_back(vec[ti]);
ctx().push_trail(history_trail<context, constraint_bound>(vec, ti, m_history));
b.first = ci;
b.second = v;
}