Re: Andrei's "iterators must go" presentation
Dragan Milenkovic wrote:
Andrei Alexandrescu wrote:
Mathias Gaunard wrote:
"Iterators can't implement it!", slide 52, about range adaptor Stride.
Iterators have trouble implementing strides because they don't
intrinsically know their limits. That's why an iterator could
implement a stride by essentially defining a mechanism to figure out
whether it's safe to take a step. Such a mechanism makes the iterator
essentially a range underneath.
So maybe some iterators are ranges underneath, but in order to kill'em
I guess all or most of iterators should have to be ranges underneath.
OTOH, all ranges are iterators underneath. Two levels of abstraction
seems the right thing to do.
I'd rather have one than two, but that's just me.
I have to ask why is it wrong to make an iterator know its limits?
It may be ugly, but IMHO it doesn't violate the concept of iterator
or make it wrong. Right?
If it knows its limits it better supports an interface that reflects
that knowledge. This means... make them ranges.
Andrei
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