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Is it appropriate way to keeps the pointers in statically allocated array this way in C++?
void *data[1000];
Is the size of void* various on 32 and 64 bit machines?
It’s almost certainly absolutely not appropriate. Void pointers are pretty damn bad to begin with, and mix them with mutable static data, and you have something quite awful. A primitive unwrapped array of a magic number size on top of that, and I’m very glad that I don’t have that in my code. Of course, if you have to, then you have to, but in the incredible majority of new code, you won’t need anything like this.
Yes, the size of void* varies.