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twa_run: better protection against empty cycles

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Fixes #337.

* spot/twaalgos/emptiness.cc, spot/twaalgos/emptiness.hh: Here.
* tests/python/except.py: Test it.
* NEWS: Mention the issue.
This commit is contained in:
Alexandre Duret-Lutz 2018-03-16 17:12:26 +01:00
parent 1c26764b13
commit 028b56d511
4 changed files with 39 additions and 1 deletions
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11
spot/twaalgos/emptiness.hh
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@ -1,5 +1,5 @@
// -*- coding: utf-8 -*-
// Copyright (C) 2011, 2013, 2014, 2015, 2016, 2017 Laboratoire de
// Copyright (C) 2011, 2013, 2014, 2015, 2016, 2017, 2018 Laboratoire de
// Recherche et Developpement de l'Epita (LRDE).
// Copyright (C) 2004, 2005 Laboratoire d'Informatique de Paris 6 (LIP6),
// département Systèmes Répartis Coopératifs (SRC), Université Pierre
@ -402,6 +402,15 @@ namespace spot
twa_run(const twa_run& run);
twa_run& operator=(const twa_run& run);
/// \brief Raise an exception of the cycle is empty.
///
/// It is OK for a twa_run to have an empty cycle while the run is
/// being filled by some procedure. But after that, we expect
/// cycles to be non-empty. Calling this function will raise an
/// std::runtime_error if the cycle is empty, giving \a where
/// (usually the name of the calling function) as context.
void ensure_non_empty_cycle(const char* where) const;
/// \brief Reduce an accepting run.
///
/// Return a run which is still accepting for <code>aut</code>,