Const ref and rvalues again...

[martin]

On Wednesday, 7 November 2012 at 02:06:09 UTC, Rob T wrote:
> What about the case where we want to pass a source argument 
> either by reference or as a copy depending on the l/r value 
> situation?
>
> eg
> void f( ref a );
> void f( a );
>
> --rt

I don't get what you mean - that's why the 2 overloads are for 
(you forgot the const/in keyword - beware! :))

void f( in ref T a );
void f( in T a );

rvalue binds to the latter overload (argument not copied, but 
moved directly).
lvalue binds to the first overload (reference).
Works with v2.060.