OK, thanks. I think your concept of a wheel could be summarised as "use of a ring buffer for modulo arithmetic". (Of course, like you said, a "ring buffer" does

OK, thanks. I think your concept of a wheel could be summarised as "use of a ring buffer for modulo arithmetic". (Of course, like you said, a "ring buffer" doesn't have to be a linked list with start and end links connected - an array that you just index carefully works too.)