Mostly about effectivity vs. efficiency in terms of game programming.
So NOW we are talking about meta programming! This excellent site showed me how easy it can be to make static compile-time decisions. I tweaked their IF construct to support some more things, but I'm really glad I found such a site. They list exactly what I need at the moment, simply nice. And it's fun, too! Amazing how many thing seem much easier than before with such an abstraction.