C++ / Why Iterators Got It All Wrong

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31.08.2017 09:50, Robert M. Münch пишет:
> On 2017-08-29 13:23:50 +0000, Steven Schveighoffer said:
>
>> ...
>> In Phobos, find gives you a range where the first element is the one
>> you searched for, and the last element is the end of the original
>> range. But what if you wanted all the data *up to* the element
>> instead? What if you just wanted to look at that specific element? So
>> we need several functions that do this, and it's not always clear how
>> to do it correctly, and it's difficult to compose one function from
>> the other.
>
> I'm a big fan of Rebol (yes, it's far from mainstream and a dead-end
> these days but it has a lot of very nice ideas) and it uses the idea of
> a series datatype. Fruther information here:
> http://www.rebol.com/docs/core23/rebolcore-6.html
>
> There you do something like:
>
> 1. Return the first hit and the rest of the series
>
>>> my-series: "abcdefg"
> == "abcdefg"
>>> find my-series "b"
> == "bcdefg"
>
>
> 2. Return only the hit
>
>>> first find my-series "b"
> == #"b"
>
>
> 3. Return everything before the first hit
>
>>> copy/part my-series find my-series "d"
> == "abc"
>
>
> If you ever got used to such a thinking, writing & using more
> non-functional approaches, really hurts.
>
Interesting. How is it comparable with iterators and ranges ideas?