Is There an Example of an Iterator Which Wouldn't use ptrdiff_t as its difference_type?

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I see that iterator_traits always defines a difference_type:

I'm just wondering why, wouldn't that be ptrdiff_t for every type? Is there an example of an iterator which doesn't use ptrdiff_t? And if not why isn't difference_type eliminated from iterator_traits and ptrdiff_t used everywhere?


I wrote a rope type that can deal with backing store greater than potential memory (that is, it can deal with 64-bit sequences even in 32-bit code). And so I had to use 64-bit size and difference types regardless of whether it was being compiled in 32 or 64 bit mode.


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