Re: [boost] Boost.RangeEx: contains?

Subject: Re: [boost] Boost.RangeEx: contains?
From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2009-02-23 12:54:12

Eric Niebler wrote:

> And that's my point exactly. I feel that this:
> 
>   boost::find( rng | filtered(pred) )
> 
> is more obscure than this:
> 
>   boost::find_if( rng, pred );
> 
> Not only that, but I presume their return types are different, too. The 
> first would return filtered iterators, the second the original 
> iterators. Isn't that right?

Indeed.

Which is why I suggested that boost::find return a [it, end[ range, 
rather than just the `it' iterator.

That way you can do

boost::empty(boost::find(rng | filtered(pred)));

instead of

auto rng2 = rng | filtered(pred);
boost::find(rng2) != boost::end(rng2);