Is there a nice syntax to achieve optional named parameters?

[Kagamin]

On Friday, 18 January 2019 at 09:39:31 UTC, John Burton wrote:
> It likely is a bad idea for a small struct like this but if it 
> was much bigger would it makes sense to write this as :-
>
> 	this(const ref Config config)
>
> Which is what you might do in C++ or does D handle this 
> differently?

For big Config struct it probably doesn't matter, but ref 
parameters don't accept rvalues.