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fix generation of symbolic automata with no moves but accepting initial state

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Murphy Berzish 2017-09-18 14:44:05 -04:00
parent 8b506375e4
commit 9b01a5153e
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);