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Automata with no state are no longer allowed.

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* NEWS, spot/twa/twa.hh: Document the change.
* spot/twa/twagraph.hh, spot/kripke/kripkegraph.hh:
  Add an exception in get_init_state_number().
  get_init_state() now calls get_init_state_number().
* spot/twa/twagraph.cc, spot/twaalgos/simulation.cc,
  spot/twaalgos/powerset.cc, spot/twaalgos/complete.cc,
  spot/twaalgos/sccfilter.cc: Remove now useless tests.
* spot/twaalgos/hoa.cc: Remove now useless comment.
* spot/twaalgos/minimize.cc: Never return an automaton with no state.
This commit is contained in:
Maximilien Colange 2016-11-25 13:42:13 +01:00
parent da6fc955a3
commit b3ee68310f
11 changed files with 24 additions and 38 deletions
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2
spot/twaalgos/sccfilter.cc
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@ -277,8 +277,6 @@ namespace spot
scc_info* given_si, Args&&... args)
{
unsigned in_n = aut->num_states();
if (in_n == 0) // nothing to filter.
return make_twa_graph(aut, twa::prop_set::all());
twa_graph_ptr filtered = make_twa_graph(aut->get_dict());
filtered->copy_ap_of(aut);