[Octave-bug-tracker] [bug #66617] structfun assumes output arguments for invoked command

[Fernando]

Follow-up Comment #11, bug #66617 (group octave):

Thanks for the info, @lt1234. The problem with your solution is that the
number of outputs of a function is not always known a priori. E.g. this
function:

function varargout=ff2(x)
varargout={x,2*x};
end

returns two outputs, but nargout(@ff2) returns -1, which means Octave does not
know a priori the number of outputs.

Because of that, your solution throws an error in this case:

s = struct ("a", 1, "b", 4);
[a, b] = structfun (@ff2, s);
error: element number 2 undefined in return list


I updated the patch with some tests which have to do with that case. This is
attached here.

@lt1234, can you confirm if the patch fixes the issue in your case? (for
convinience, I also attach the file, structfun.m, resulting from applying the
patch).

(file #56743, file #56744)

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Additional Item Attachment:

File name: structfun5.diff                Size: 2KiB
    <https://file.savannah.gnu.org/file/structfun5.diff?file_id=56743>

File name: structfun.m                    Size: 6KiB
    <https://file.savannah.gnu.org/file/structfun.m?file_id=56744>


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