Can't recreate a range?

[Paul Backus]

On Thursday, 30 April 2020 at 16:21:05 UTC, Steven Schveighoffer 
wrote:
> I would say part of the issue is that you are doing all your 
> work in front and not popFront.
>
[...]
>
> I'd say:
>
> 1. move your work to the popFront function (you then need to 
> call popFront once before returning the range in your factory 
> method).
> 2. change empty to check if the buffer is empty instead of the 
> input.

Doing work in popFront instead of front is usually an 
anti-pattern, since it forces eager evaluation of the next 
element even when that element is never used. You should only do 
this if there's no reasonable way to avoid it.