[Octave-bug-tracker] [bug #49793] octave's inputParser only accepts validation functions that return true or false

[Mike Miller]

Follow-up Comment #8, bug #49793 (project octave):

The main point of jwe's idea was that it does depend on fixing nargout so it
works for builtins. I wonder about anonymous functions though.

Amro - a couple points about your suggestion. There is no error ID that can be
caught in Octave yet for the error of too many output arguments (that can be
fixed of course). And this nested approach means that val may be called more
than once on the given argument. It's likely that most validation routines
will be pure functions, but it's possible to have some side effects from
calling the validation function more than once.

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