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Merge pull request #1259 from mtrberzi/automata-fix

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Fix generation of symbolic automata with no moves but accepting initial state
This commit is contained in:
Nikolaj Bjorner 2017-09-18 21:22:00 +02:00 committed by GitHub
parent 6ddc549557 9b01a5153e
commit 66bc68f128
1 changed files with 9 additions and 1 deletions
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10
src/math/automata/symbolic_automata_def.h
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@ -451,7 +451,15 @@ typename symbolic_automata<T, M>::automaton_t* symbolic_automata<T, M>::mk_produ
}
}
if (mvs1.empty()) {
return alloc(automaton_t, m);
if (a.is_final_state(a.init()) && b.is_final_state(b.init())) {
// special case: automaton has no moves, but the initial state is final on both sides
// this results in the automaton which accepts the empty sequence and nothing else
final.clear();
final.push_back(0);
return alloc(automaton_t, m, 0, final, mvs1);
} else {
return alloc(automaton_t, m);
}
}
else {
return alloc(automaton_t, m, 0, final, mvs1);