Associative arrays

[Brian Schott via Digitalmars-d-learn]

On Tuesday, 10 November 2015 at 01:29:11 UTC, Brian Schott wrote:
> Yes. It's a hack that gives you a modulus without having to do 
> a modulus. It only works on powers of two.

http://graphics.stanford.edu/~seander/bithacks.html#ModulusDivisionEasy