Michael Marcin wrote:
Erik wrote:
Or is it possible to configure BOOST_FOREACH to be as efficient as my macro?
I don't know but that is a good question.
I considered using BOOST_FOREACH until I checked its generated output... which was worse than std::for_each with a boost::bind which was worse than std::for_each with a hand coded functor which was worse than a hand coded for loop like yours above.
I won't deny that the abstraction penalty of BOOST_FOREACH is not zero, but have either of you actually measured the overhead? I have, and I found BOOST_FOREACH to be about 5% slower than the equivalent hand-coded loop when compiler optimizations are turned on. It's really very small, and that 5% buys you a lot of expressivity. YMMV. -- Eric Niebler Boost Consulting www.boost-consulting.com