When implementing operator[] how should I include bounds checking?

Question

First of all I apologize for the long lead up to such a simplistic question.

I am implementing a class which serves as a very long 1 dimensional index on a space fil

Answer 1

The modulo operator works surprisingly well for array indices -- it also implements negative indices (ie. point[-3] = point[dimensions - 3]). This is easy to work with, so I'd personally recommend the modulo operator as long as it's well-documented.