Re: [boost] tie alternative?

Subject: Re: [boost] tie alternative?
From: Jonas Persson (l.j.persson_at_[hidden])
Date: 2008-10-27 08:58:29

David Abrahams skrev:
> OK, BOOST_FOREACH aside, iterating over a range returned as a pair of
> iterators can be painful and ugly:
> 
>   vertex_iterator pv, ve;
>   tie(pv, ve) = vertices(g); // unpack the pair returned by vertices
>   for (; pv != pe; ++pv)
>   {
>       ...
>   }
> 
> However, we can make it much nicer, e.g.:
> 
>   for (vertex_iterator pv,ve = xxx(pv,vertices(g)); pv != ve; ++pv)
>   {
>       ...
>   }
> 
> My only problem is how to spell xxx.  The attached proof-of-concept uses
> operator%, but I don't feel particularly good about that choice either.
> Ideas?
> 

What is the usecase here?
I'm curious on why it isn't covered by BOOST_FOREACH and if that case 
really is common enough for a special solution like this.

   / Jonas