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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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7
spot/kripke/kripkegraph.hh
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@ -177,16 +177,15 @@ namespace spot
graph_t::state get_init_state_number() const
{
// If the kripke has no state, it has no initial state.
if (num_states() == 0)
const_cast<graph_t&>(g_).new_state();
throw std::runtime_error("kripke has no state at all");
return init_number_;
}
virtual const kripke_graph_state* get_init_state() const override
{
if (num_states() == 0)
const_cast<graph_t&>(g_).new_state();
return state_from_number(init_number_);
return state_from_number(get_init_state_number());
}
/// \brief Allow to get an iterator on the state we passed in