I have this code laying around for a long time. I know I used it, but I can't remember what my use-case was. However, it is simple enough. I think it may be worth adding it if someone can think of a use case.

Basically, it allows you to get an integer type based on a templated bit size, i.e. sized_ints<40>::int_least_t will be an integer type with at least 40 bits.