[petsc-dev] CHKERRXX() to propagate errors from C

[Matthew Knepley]

On Wed, Oct 19, 2011 at 8:02 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> On Wed, Oct 19, 2011 at 14:57, Matthew Knepley <knepley at gmail.com> wrote:
>
>>    The properly manage the clean up of partially created objects etc don't
>>> they, which our C approach cannot handle. Not that I'm advocating for using
>>> them or not.
>>
>>
>> Hmm, I do not see how. As far as I know, you need logic to do that once
>> you catch them, which we could also put in.
>>
>
> Destructors for any live automatic (stack) allocated are called when an
> exception is raised. Of course it causes all manner of havoc if any of these
> destructors fail, but having them called means that you can use RAII and
> "simply" have code that can unwind cleanly. That control flow is much harder
> with return codes because you end up with either lots of gotos to unwind
> from each place that can fail or deeply nested control structures.
>

Aren't all those destructors called on return too?

   Matt

-- 
What most experimenters take for granted before they begin their experiments
is infinitely more interesting than any results to which their experiments
lead.
-- Norbert Wiener
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