This example is neat. Generalizing it a bit... it seems that if you have to visit data frequently in other processing, and you need it ordered later, or for performance, throwing in a swap while doing the visits may help optimize later steps.

This of course assumes that the swap won't mess up the processing algorithm.

It also is an optimization, so best left for later stages of development.

Anyway, thanks for showing this example - it gives me another trick to try for a couple projects I'm working on. :)