Re: [Boost-users] A forward iterator need not be default-constructible

Subject: Re: [Boost-users] A forward iterator need not be default-constructible
From: Krzysztof Żelechowski (giecrilj_at_[hidden])
Date: 2011-09-30 06:16:08

Dave Abrahams wrote:

> make it copyable, for example.  A wrapper over a plain pointer could
> initialize the pointer to 0.  Now it's a valid past-the-end iterator
> into an array of length zero.  Such an iterator is also comparable with
> other iterators into the same sequence.  That's actually far from
> being minimally singular.
> 

I doubt there may be a sequence of length 0 at NULL.  How would you allocate 
such a sequence?

Chris