Arno Schödl schrieb:

Hello,

I am sure this has come up a few times, but I could not find the answer in the archive.

counting_iterator<int>::difference_type is __int64 by default. I understand the underlying rationale, but I am not sure whether it is the right choice given the existing practice of C/C++. The problem of int minus int overflowing is not restricted to counting_iterator. Still, C/C++ chose to make int minus int -> int, probably for performance reasons. So why shouldn't counting_iterator by default behave the same way? If someone needs something else, she can still override the default.

You are able to override the difference_type by providing your own type. See: boost::counting_iterator<int,boost::use_default,int>::difference_type HTH Kim

Arno

-- Dr. Arno Schoedl · aschoedl@think-cell.com Technical Director

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