Object Oriented Implementation Question

[DailyDose]

So I've inherited a project that uses objects.  And I want to improve upon the design by introducing asynchronous loops.  But before I go about messing with this too much to implement, I was curious if objects work anything like Data Value References and FGVs.  If I update the object in any of the asynchronously running VIs, is it updated everywhere or only in that instance?

[johntrich1971]

The object itself is just an object, like a DBL or I32. However, an object can be implemented so that all of the data contained in the object is by reference (with a DVR, for example). So the answer to your question is maybe, but it depends on how the original developer set them up.

[crossrulz]

LVOOP is By-Value.  You can use a DVR (of the class) to make it By-Reference, but this is generally not recommended.  I think there is an article floating around about this.  I'd have to do some digging to see if I can find it.

[DailyDose]

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@johntrich1971 wrote:

The object itself is just an object, like a DBL or I32. However, an object can be implemented so that all of the data contained in the object is by reference (with a DVR, for example). So the answer to your question is maybe, but it depends on how the original developer set them up.

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So the photo I'm showing is a simple "right-click create class" object.  So what do I do to this class so that it updates in all instances?

[BertMcMahan]

No, objects are, by default, by-value. You can make them by-ref by using DVR's, single-element queues, etc. There's also the GOOP toolkit that automates some of that but I've never used it myself.

[crossrulz]

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@DailyDose wrote:

So the photo I'm showing is a simple "right-click create class" object.  So what do I do to this class so that it updates in all instances?

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You pass around the DVR reference and use the In Place Element Structure to access the object.  The IPES will act as a mutex to keep multiple places from trying to access it at the same time.

[wiebe@CARYA]

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@DailyDose wrote:

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@johntrich1971 wrote:

The object itself is just an object, like a DBL or I32. However, an object can be implemented so that all of the data contained in the object is by reference (with a DVR, for example). So the answer to your question is maybe, but it depends on how the original developer set them up.

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So the photo I'm showing is a simple "right-click create class" object.  So what do I do to this class so that it updates in all instances?

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Turn this off, then you can put the class in a DVR.

I personally avoid DVRs (anything not by wire actually) at almost all costs.

They are hell to debug.