Whats the proper way to write a Range next function
JG
someone at simewhere.com
Wed Jun 15 17:30:31 UTC 2022
On Wednesday, 15 June 2022 at 13:52:24 UTC, Christian Köstlin
wrote:
> the naive version would look like
>
> ```d
> auto next(Range)(Range r) {
> r.popFront;
> return r.front;
> }
> ```
>
> But looking at a mature library e.g.
> https://github.com/submada/btl/blob/9cc599fd8495215d346ccd62d6e9f1f7ac140937/source/btl/vector/package.d#L229 is looks like there should be tons of annotations/attributes on it.
>
> Kind regards,
> Christian
I not sure of your use case. But you need to check if the range
is empty before and after calling popFront (and decide what to if
it is). Also unless you want the original range passed in mutated
you should call save (assuming you have a forward range) before
calling your next or you need to modify next so it calls save.
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