Re: [boost] BOOST_FOREACH slow?

Subject: Re: [boost] BOOST_FOREACH slow?
From: Peter Bartlett (pete_at_[hidden])
Date: 2008-11-19 12:35:18

Quoting bjorn_at_[hidden]:

> Ok, do anybody know of other compilers/libs that implement loop unrolling
> in std::for_each?

Are you looking for optimizations specifically for std::for_each other  
than those done by the compiler for general for loops?

If so, possibly of interest is the fact that new in GCC 4.3 is the  
(experimental) ability to call parallel versions of certain algorithms  
in <algorithm> and <numeric> via OpenMP:

http://gcc.gnu.org/onlinedocs/libstdc++/manual/parallel_mode.html

This could put some distance between BOOST_FOREACH and std::for_each  
for certain use cases though I haven't experimented myself.

Pete