Andreas Pakulat schrieb:
Model indices are not persistent across application runs, but the Qt
views do cache model indices that they retrieve from the model. As I
said above, if you use internalPointer in python you need to make sure
to keep a reference to the object yourself, i.e. in a list or dict.
Thats why I tend to use internalId and keep a dict of id->object in the
model.
Andreas
How can you know when Qt decides to reuse some memory?
Quote from QModelIndex docs:
> Model indexes can become invalid over time so they should be used
> immediately and then discarded. If you need to keep a model index
> over time use a QPersistentModelIndex <qpersistentmodelindex.html>.
...and even QPersistentModelIndex <qpersistentmodelindex.html> will
become invalid if the index
is no longer reachable. Haven't tested, but a guess would be
that QPersistentModelIndex <qpersistentmodelindex.html> may become
invalid, but keeps the pointer
or its internal is guaranteed to still be unique. But as I said, this is
just a
guess (nothing regarding this mentioned in the docs).
Jürgen
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