From: David Abrahams (abrahams_at_[hidden])
Date: 2001-04-05 12:04:49
----- Original Message -----
From: "Jeremy Siek" <jsiek_at_[hidden]>
Sent: Thursday, April 05, 2001 12:10 PM
Subject: Re: [boost] complex_adaptor, iterator_adaptor, etc.
> On 5 Apr 2001 nbecker_at_[hidden] wrote:
> nbecke> One problem I've encountered is what to do with:
> nbecke> Reference dereference(type<Reference>, const BaseIterator& i)
> nbecke> For example, if you are adapting a complex container extracting
> nbecke> real part, you can't get a reference to it. I guess the only
> nbecke> would be to return a proxy object that overloads assignment?
> Well, if you could get at a reference to the real part, then you could use
> the projection iterator adaptor. But, as you point out below, you can't.
> So you're stuck with the ugly proxy thing (you'd be stuck with this
> whether or not you used iterator adaptor). You'll need to use the proxy
> object as the Reference type of the iterator adaptor. And you'll be stuck
> with using input_iterator_tag as the iterator_category :(
> (yet another example of the need for my new iterator categories and
Why bother with the proxy if you're just doing input iterators? Do you need
to write through the Reference type?
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