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From: David Abrahams (dave_at_[hidden])
Date: 2004-12-02 10:36:03

Arkadiy Vertleyb wrote:
> "David Abrahams" <dave_at_[hidden]> wrote
>>Peder Holt wrote:
>>>given a metafunction is_iterator<> there may be a way around this
> problem:
>>Problem is, it's impossible to write that metafunction.
> Well, it's not possible in general case, but for the purpose of typeof, a
> rough approximation may be enough. We can just assume that, if the type was
> not caught by all the specializations (generated by registration), then it
> *might be* one of the standard iterators. We can use SFINAE, examining
> value_type, distance_type, etc., to increase the probability of that
> assumption.

As long as you don't mind access violations when one of those typedefs
happens to be present, but private.

Dave Abrahams
Boost Consulting

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