12. Ideally RegionAllocator would be AlignedAllocator!(16,
RegionAllocator!(FreeListAllocator!(LibcAllocator))).
That's maybe composition power pushed a bit far, but that's a good
analysis of what dsimcha provides.
This composition, with an alias to make it more friendly, has some
kind of beauty...
I even found a beautiful bug trying this out.
http://d.puremagic.com/issues/show_bug.cgi?id=6630
But especially with classes any thing like that is completely unusable.
You can't pass parameters to the individual constructors and loose track
of function hiding. The long-time direction might use such things behind
the facade.
