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

2011/9/30 Krzysztof Żelechowski

Dave Abrahams wrote:

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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?

That's not what he said. As an aside though, recall that *char foo[0]; *is a valid declaration of a zero-length aray.