RE: [boost] Re: Lambda conflicts

From: Hurd, Matthew (hurdm_at_[hidden])
Date: 2003-09-03 08:37:00

> From: Markus Werle
> Subject: [boost] Re: Lambda conflicts
> 
> {
>   namespace l = boost::lambda;
> 
>   [...] l::_1 [...]
> }
> and lookup rules never bite

Yep, that's what I do, but it never looks quite so neat ;-)
 
> > Would be nice to solve the conflicts with boost::bind and 
> > lambda::bind.
> 
> The conflict is due to the existence of ::_1 in the boost library 
> (placeholders.hpp)
> 
> I requested ::_1 to be moved to namespace boost::bind or 
> boost::anything_else some months ago. 
> Peter Dimov rejected this, David Abrahamas rejected the 
> rejection, http://groups.yahoo.com/group/Boost-Users/message/2880
> but then nothing happened. I consider the _1 living in global 
> namespace 
> as a really severe, annoying bug (OK, admittedly I consider 
> most code not living in its own namespace at least as suboptimal)
> 
> > Also there is, at least, a conflict with _1 between spirit 
> and lambda 
> > that has bitten me, perhaps others...
> 
> As long as all those live in their own namespace 
> a simple "using that::_1;" saves you from all pain.
> For me the namespace alias trick is the one to get around 
> any failure, even with broken libraries at hand.

Thanks Markus.  Perhaps ::_1 will vanish one day.  

The bright spot is it smacks of an embarrassment of riches rather than a
paucity. It is nice to have such problems :-)  If only I was more capable
then I could fix them...

> Markus

Regards,

Matt.