Re: [boost] BOOST_FOREACH slow?

Subject: Re: [boost] BOOST_FOREACH slow?
From: Eric Niebler (eric_at_[hidden])
Date: 2008-11-17 16:37:39

Mathias Gaunard wrote:
> Eric Niebler wrote:
> 
>> During FOEACH's review, extensive performance tests showed FOREACH was 
>> only about 5% slower than the hand-coded equivalent on average.
> 
> Why not make FOREACH as fast as hand-coded equivalents when it is possible?
> With decltype, typeof, or the MSVC hack it shouldn't be a problem. Also 
> some compilers have native support for foreach-like loops.

I haven't spent a lot of time thinking about it, but I imagine making 
this transparent to users would be hard. BOOST_FOREACH has documented 
customization points that any alternate implementation should respect.

-- 
Eric Niebler
BoostPro Computing
http://www.boostpro.com