Re: [boost] Range begin/end and Fusion begin/end

Subject: Re: [boost] Range begin/end and Fusion begin/end
From: Jeffrey Hellrung (jhellrung_at_[hidden])
Date: 2010-03-18 13:49:33

Mathias Gaunard wrote:
> In C++0x, begin and end are supposed to be found through ADL, and this 
> might end up considering fusion::begin/fusion::end as possible overloads.
> 
> Unfortunately, this breaks, as fusion::begin and fusion::end produce 
> hard errors when passed something else than a fusion sequence.
> 
> All in all, I find ADL very dangerous. Should it be advocated not to use 
> the names "begin" and "end" for something else than ranges to avoid issues?
> I suppose that for Fusion, it could be possible to use SFINAE to mask 
> the overloads if the arguments aren't fusion sequences.

Hmmm...that's unfortunate that C++0x decided to "usurp" use of 
begin/end, seeing as how it's established practice (isn't it?) that 
those functions could be meaningful outside the context of ranges. 
Seems to me that Boost.Range's lookup via ADL of range_begin and 
range_end makes more sense...

- Jeff