[omniORB] Validity test

[Clarke Brunt]

>The invocation is
>
> MyModule::MyClass::SeqSeqStr_var listv;
>  ...     
> listv=manager->list(query_);
>
> I know that omniORB does not use
> null pointers to represent nil references.
> How could I check the validity of listv?
> Can be _is_nil(CORBA::Object *) applied
> in this case?

Writing a bit 'off the top of my head', I wonder in what sense you mean
'validity'? Don't think you can use _is_nil, since it isn't a CORBA::Object.
If you wanted to test whether the _var contained a non-NULL pointer, then
I've been known to use e.g. if (listv.operator->())... but I've only ever
used this when I have a _var that I've declared, but may or may not have
assigned anything to yet. In your case, you've definitely filled it in (with
the result of the 'list' call). So I think you must just assume that it is
'valid'. If (say) your implementation had tried to return a NULL pointer,
rather than a pointer to a created sequence, then I would have expected to
get an exception propagated back to the client, so no need to test the _var
(catch the exception instead). The sequences may well be of zero length, as
may the strings, but there's nothing 'invalid' about that (if it was what
you intended).