[Ves] Virtual destructors in abstract VES classes

[Casey Goodlett]

Aashish,

>
> I wonder why I didn't see these errors. Which flag did you enable? I
> have branch with some fixes. I will update the branch and push and
> merge it to next.
>
>

In XCode GUI I enabled "Nonvirtual Destructor" under the C++ warnings.

Thanks