Binding rvalues to ref parameters redux

[Nick Treleaven]

On Tuesday, 2 April 2019 at 23:40:42 UTC, Nicholas Wilson wrote:
> On Monday, 1 April 2019 at 16:43:15 UTC, bitwise wrote:
>> So finally, I would suggest that rvalues only bind to 'in ref'.
>
> This comes down to an opt in vs opt out, 'in ref' (leaving 
> aside the issues with const) mean that bindings and code must 
> be updated to allow use, whereas rvalues not binding to 'out 
> ref' allows immediate use. I'm for opt out.

BTW `out` can't be used like `ref`, there's no way to pass data 
in to the function. From the docs:

out	parameter is initialized upon function entry with the default 
value for its type