On Friday, 12 February 2016 at 15:12:19 UTC, Steven Schveighoffer
wrote:
On 2/12/16 9:37 AM, Matt Elkins wrote:
[...]
Pass by reference and pass by value means different treatment
inside the function itself, so it can't differ from call to
call. It could potentially differ based on the type being
passed, but I'm unaware of such an optimization, and it
definitely isn't triggered specifically by 'in'. 'in' is
literally replaced with 'scope const' when it is a storage
class.
-Steve
note that 'in' and 'scope'(other than for delegates) parameter
storage class usage should be avoided.
It really should be a warning.
