Re: [Boost-users] iterators must go

Subject: Re: [Boost-users] iterators must go
From: John Dlugosz (JDlugosz_at_[hidden])
Date: 2009-05-15 11:15:31

> Date: Wed, 13 May 2009 02:18:07 -0400
> From: Scott McMurray <me22.ca+boost_at_[hidden]>
> Subject: Re: [Boost-users] iterators must go
> To: boost-users_at_[hidden]
> Message-ID:
> 	<fa28b9250905122318s3460e1dam5d624160d95ced5_at_[hidden]>
> Content-Type: text/plain; charset=UTF-8
> 
> On Sun, May 10, 2009 at 09:24, Neal Becker <ndbecker2_at_[hidden]>
wrote:
> > Interesting presentation:
> >
> > http://www.boostcon.com/site-
> > media/var/sphene/sphwiki/attachment/2009/05/08/iterators-must-go.pdf
> >
> 
> Very persuasive, but it's careful to touch only the examples that look
> nice.  Note, for example, that every range was a whole container.
> 
> The three-iterators part was somewhat handwaved-over as well.  Take
> this bit of current code, for example:
> 
>     auto i = find(c.begin(), c.end(), some_pred());
>     rotate(c.begin(), i, c.end());
> 
> How do you do that nicely with ranges, when he has find returning a
> range?  (Since right now, it implicitly actually returns 2 ranges.)
> 
> And how does insertion work?  Do we still need to keep the iterators
> around for insertion position?
> 
> I'd love to see the finicky bits worked out, though, since I do like
> the idea.
> 
> ~ Scott

Any place you really want a single iterator, a range of one value would
work.  For appending or streaming out, you really want the concept of an
open-ended range.

--John

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