My two cents

[user1234]

On Saturday, 21 October 2017 at 19:39:31 UTC, Andrei Alexandrescu 
wrote:
> [...]
> Using the topic of the Elvis operator as a running example, a 
> good DIP would contain motivation such as:
>
> * Present evidence of the successful use of ?: in other 
> languages

I'm not sure that people talked much about the elvis operator 
(which was introduced in the topic by M.Nowak). In the first 
message were mentioned the null coalescence operator "??" and the 
safe navigation one "?." . The later was more discussed.