Call By Reference using LVOOP

[Eugen Graf]

Is there any possibility to "simulate" Call By Reference using LVOOP? I mean if my class contains only refnums to real objects or something like that. The problem is that some of my classes contains very large members and if I call member VIs, than each member VI will get the whole class but needs e.g. only to read one value.

Thanks, Eugen

[Aristos Queue]

Just because the subVI gets the entire class does NOT mean that the entire class gets copied. If you pass a class into a subVI then unbundle a single element, the class is not copied at the call. If you then use that single element in a read-only way (for example, connecting it to the select terminal of a case structure) the class is still not copied at the call. If you use the element in a write operation (such as wiring it to the Increment primitive), the element is copied, but the class is still not copied at the call. If you then bundle the incremented element back into the class, the class MAY be copied at the call, depending upon whether the particular call itself is already set up for writing (for more details see the large body of documents across the WWW about "inplaceness").

Is that enough reference for you?

[Eugen Graf]

Yes, this info is exactly what I needed. Would you give me please a link, where inplaceness in LabVIEW is describen very well.

Thank you, Eugen

[Aristos Queue]

QUOTE (Eugen Graf @ Jan 23 2009, 10:19 AM)

Yes, this info is exactly what I needed. Would you give me please a link, where inplaceness in LabVIEW is describen very well.

No. Because if I gave you such a link, you'd start caring about it. Stop caring. Really. Let LV make copies when it sees that your code needs copies and stop worrying about it. If you really hit a performance problem, you can dig into the topic further, but until then, let it go. It is almost never of interest to a LabVIEW programmer.

[Eugen Graf]

Ok, I'll belief you on this point.

Thank you for nice support, Eugen

[Grampa_of_Oliva_n_Eden]

QUOTE (Eugen Graf @ Jan 23 2009, 12:20 PM)

Ok, I'll belief you on this point.

Thank you for nice support, Eugen

Hi Eugen,

Although I don't care about inplaceness (cough, cough) if you ever find that you have to care about inplaceness then you may want to chase down all of the links and related links that I did not care to assemble in http://forums.ni.com/ni/tagging/view_tag?tag.text=Inplaceness&tag.message_scope=all' target="_blank">this Tag on the dark-side.

Still not caring about inplaceness,

Ben