[Libreoffice-bugs] [Bug 125180] Bad behaviour in BASIC procedure with several optional parameters.

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=125180

--- Comment #10 from Andreas Heinisch <andreas.heinisch at yahoo.de> ---
(In reply to Mike Kaganski from comment #9)
> (In reply to Andreas Heinisch from comment #8)
> > I investigated the error and I think I need some clarifications: 
> > 
> > - in VB the function IsMissing works only with variant datatypes
> > - in LO IsMissing works or should work even with other datatypes?!?
> 
> Why are you asking? You have just fixed tdf#36737 ;-)

The more I work with these optionals/missing parameters, the more I get
confused hahaha, but I found many RefCards, where it states, that it should
work with every datatype, whereas in VB it works only with Variants.

> 
> > In the
> > majority of the cases it works :). I does not work in the case, where the
> > missing parameter is before any non missing parameters, e.g.,
> > SubTwoParameters(,2)
> 
> When you fixed the mentioned bug, in SbiRuntime::StepPARAM there was initial
> part assigning error 448 to missing previous arguments. That looks relevant.
> There should be a difference somewhere that treats actually missing
> parameter differently compared to error 448.

The thing is that the parameter already has a value in StepPARAM, because it
has been converted from Error to Int. In SbiRuntime::StepEMPTY() it gets the
error value
(https://opengrok.libreoffice.org/xref/core/basic/source/runtime/runtime.cxx?r=8e323fca#2744)
and later it will be converted to the specified type, for instance in
https://opengrok.libreoffice.org/xref/core/basic/source/sbx/sbxuint.cxx?r=4fdc90c5#53.

I will search for a fix ...

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