Correct me if I’m wrong, but gsl::span (or an array_view) conforms (one of) the 
ranges concept, i.e. it *is* a range.

No need to wait for c++20 =)

> 16 мая 2019 г., в 22:23, Mikhail Svetkin <mikhail.svet...@gmail.com> 
> написал(а):
>  
> If we will return a range (C++20 accepted ranges) then we can provide better 
> integration with other world and we will pay for implicit shared only when we 
> need it.

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