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twagraph: improve doc

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Based on report by Michaël Cadilhac.

* spot/graph/graph.hh, spot/twa/twagraph.hh (defrag_state): Clarify
that only unreachable states are meant to be removed.
* spot/twa/twagraph.hh (merge_edges): Typo in comment.  Fixes #454.
* THANKS: Add Michaël.
This commit is contained in:
Alexandre Duret-Lutz 2021-02-18 22:15:58 +01:00
parent 57b508c767
commit 0b048e1c05
3 changed files with 28 additions and 10 deletions
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17
spot/graph/graph.hh
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@ -1289,10 +1289,19 @@ namespace spot
/// \brief Rename and remove states.
///
/// \param newst A vector indicating how each state should be renumbered.
/// Use -1U to erase a state. All other numbers are expected to
/// satisfy newst[i] ≤ i for all i.
/// \param used_states the number of states used (after renumbering)
/// This method is used to remove some states that have been
/// previously detected to be unreachable in order to "defragment"
/// the state vector. When a state is removed, all its outgoing
/// transition are removed as well. Removing reachable states
/// should NOT be attempted, because the incoming edges will be
/// dangling.
///
/// \param newst A vector indicating how each state should be
/// renumbered. Use -1U to erase an unreachable state. All other
/// numbers are expected to satisfy newst[i] ≤ i for all i.
///
/// \param used_states the number of states used (after
/// renumbering)
void defrag_states(std::vector<unsigned>&& newst, unsigned used_states)
{
SPOT_ASSERT(newst.size() >= states_.size());