http://forums.ni.com/t5/LabVIEW-Idea-Exchange/Automated-creation-of-polymorphic-VIs/idi-p/2111968
Make sure to Kudo it
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Now to the idea of generics, I think one thing that would be help along these lines, would be to be specific of the "Killer App" that's not even possible without generics in LV.
One of these things that Brian Powell mentioned recently that made all the difference to me, is that we've got a limited number of things that we can focus on, and those can be the things that are not possible at all, or those things that we can do, but want easier.
Sure, life would be grand if we could do everything, but this is a much much harder problem to solve than you might imagine.
And when I say 'solve' I mean, do right, not make possible with a Multitude of bugs and limitations and gotchas (including corrupting your codebase)
So when it comes to having this feature, it would likely take a huge chunk away from making the impossible, possible.
But if you make a case where this is a huge benefit which is completely impossible, things start to get interesting.
So if you've got one of those, or even several, Make Them Known.
http://forums.ni.com/t5/LabVIEW-Idea-Exchange/Provide-a-better-way-to-implement-a-polymorphic-VI/idi-p/920487
http://forums.ni.com/t5/LabVIEW-Idea-Exchange/C-like-Class-templates-for-Labview-classes/idi-p/1714078
Wish I had a better answer, but as an aside, if this is something not going into a product and you'll just use to make your life developing other code possible.....you might want to ping me offline