Const ref and rvalues again...

[martin]

On Wednesday, 7 November 2012 at 02:58:57 UTC, Era Scarecrow 
wrote:
> Maybe a very simple change/addition; Like perhaps @ref? 
> (Attribute ref, Alternate ref, auto ref.. All sorta fit for 
> it's meaning).
>
> So...
>
> void func1(ref int x);  //D lvalue-only ref
> void func2(@ref int x); //works like c++'s ref
>
> Seems fairly easy to tell apart, and still leaves const-ness as 
> an option.

Afaik C++ doesn't allow rvalues to be passed to _mutable_ 
references (T&), only to const references, making perfect sense 
imo. I really do not see the point for an additional syntax for 
C++-like const references (const T&) which would also take 
rvalues.
Please give me an example where you want to pass an rvalue to a 
_mutable_ reference parameter. I would simply continue to 
disallow that, since that would mean that changes to the 
referenced rvalue would not be visible for the caller (a 
temporary/literal is changed - how could someone possibly want 
that?).