Re: [Boost-users] Boost.Foreach performance

From: Thomas Matelich (matelich_at_[hidden])
Date: 2007-08-01 11:10:10

On 7/31/07, Eric Niebler <eric_at_[hidden]> wrote:
>
> Thomas Matelich wrote:
> > So, I'm loving Foreach and as I watch it spread throughout our
> > codebase, of course it runs across the desk of our optimization
> > obsessed team member.  So, I was curious if you could address runtime
> > performance of Foreach.  I would expect it to be essentially
> > equivalent to a hand written for loop with caching of end().  But
> > what's the overhead of the auto_any_t, etc.?
>
> FOREACH is ~5% slower than the equivalent hand-coded loop, but for most
> loops (e.g., that have non-empty loop bodies) the small overhead is lost
> in the noise. What overhead there is is due to an extra test/set of a
> boolean at each loop iteration.
>
> You can find some performance comparisons here: http://tinyurl.com/2loc29
>

Thanks for the info.  /me happily evangelizes Foreach throughout the group.