Peng,
The space between the ++ and i is fine. Some find ++i more readable,
that is all.
It is difficult to optimize away the repeated f(n) calls because f()
could have side effects and there is no guarantee it will always return
a constant. If f() always returns a constant, this could potentially be
optimized by interprocedural constant propagation(IPCP)
IPCP work is being done on the ipa branch but I don't think it is safe
to assume whether it will be optimized.
If your f() returns a constant, your best bet is to do:
for (int i =0, j = f(n); i < j; ++i) {
}
Regards,
Ryan Mansfield
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