Implicit Function Template Instantiation (IFTI) Question

jmh530 john.michael.hall at
Mon Apr 27 18:29:06 UTC 2020

On Monday, 27 April 2020 at 17:40:06 UTC, Steven Schveighoffer 
> [snip]

Thanks for that. Very detailed.

In terms of a use case, we just added a center function to mir 
[1]. It can take an alias to a function. I wanted to add a check 
that the arity of the function was 1, but it turned out that I 
couldn't do that for mean [2] because it has a similar structure 
as what I posted and arity relies on isCallable, which depends on 


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