What you're saying is that the Cocoa culture doesn't generally use
@try/finally to wrap teardown/cleanup/finalize code, so it's
generally not safe to use exceptions for flow control, unlike Python?
Or even for indicating errors it would seem. Basically if the Cocoa
code base is not designed to be exception-safe, then you better not
ever let an exception escape into Cocoa code. Sounds reasonable.
I would just point out that this doesn't demonstrate a problem with
exceptions per-se, any more than the existence of non-thread-safe code
indicates a problem with using threads. Writing exception-safe code
is similar to writing thread-safe code in that it's a lot easier if
you've considered it throughout the code's lifetime rather than trying
to introduce it late in the codebase's life. Given that exceptions
were only recently added to Objective-C, it's not surprising that most
existing ObjC code isn't exception-safe.
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