[boost] Re: any interest in a foreach looping construct?

From: Russell Hind (rhind_at_[hidden])
Date: 2003-10-10 11:58:57

Glen Knowles wrote:

> I write a lot of those little for loops (one of my "choosen" compilers 
> is HP aC++, no lamda, flaky bind, etc, yuck) and I would definitely use 
> the macro.
> 

I use bcc 5.6.4 and can use bind but not lambda but have just started 
using phoenix for simple constructs e.g.

for_each(a.begin(), a.end(),
         phoenix::arg1 = phoenix::arg1 * -1.0);

I'm unsure about the macro.  I haven't looked at the 
container_traits/sequence_algo mentioned elsewhere in this thread yet.

Its an interesting idea, and I would possibly use it were it accepted 
into boost.

One thing that worries me about the inital example is if you forget to 
declare i as a reference, then it breaks.

Could the type of the local not be auto-declared? so it becomes

BOOST_FOREACH(i, int_list)
{
...
}

That way, the user doesn't have to remember the & or not.

Cheers

Russell