David Abrahams:
Well, one thing that does have an effect on the maximum iteration count with a given depth limitation is the initial "tree height" from where you start:Vesa Karvonen: > It seems to be quite tricky to reach maximal iteration counts using > this technique. I think that others might have more insight into how > to tune the code for maximal iteration counts.What do you mean by "maximal iteration counts?" If you mean, "the maximum possible under a given depth limitation", then clearly there's no such number because you can always do more unrolling... so obviously you don't mean that. ;-)
template<class P, class O, class X>
struct until : mpl::apply_if<mpl::apply1<P,X>,
mpl::identity<X>,
until_up<3,P,O,X> > {};
^
Changing the above number does have an effect on the maximum iteration count.
Another thing that does have an effect on maximal iteration count is the way that the until, until_up and until_down templates are programmed. If you can avoid a single recursion in their code, it can have a big effect (superlinear) on the total maximum iteration count.
-Vesa Karvonen
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