state of ranges

[Neia Neutuladh]

On Tuesday, 12 December 2017 at 18:58:11 UTC, Luís Marques wrote:
> Ok, so the consensus was to make ranges easy to use. Was there 
> any progress on mechanisms to avoid the possible performance 
> penalties, and to make the implementation side more regular?

Have you noticed performance problems or implementation side 
irregularities?

It would be handy for us to make benchmarks (if nobody has done 
it yet?), but my feeling is that it doesn't have a measurable 
impact on performance in the context of a single iterator 
compared to opApply. Probably has a greater impact when you're 
stacking things together, since ranges can use design by 
introspection to do less work.