Const ref and rvalues again...

[martin]

On Monday, 22 October 2012 at 09:41:38 UTC, Timon Gehr wrote:
> (But it might be added that C++11 adds a new language feature
> just in order to be able to distinguish const and rvalue
> references in the callee, so even with C++'s semantics, this
> does not seem like a good idea.)

Yeah, and that T&& syntax is mainly used for _mutable_ rvalue 
references in move constructors and assignment operators to move 
(hijack) mutable data from the rvalue to another T instance 
instead of copying that data, knowing that the rvalue's data is 
not going to be accessed anymore anyway. So this is a different 
case and does currently not apply to D afaik since there is no 
way to forward rvalues:

void foo(ref T lvalue) { }
void foo(T rvalue)     { }

In the latter overload for rvalues, you aren't given the original 
rvalue, but a copy of it!

Distinguishing between _const_ rvalue and lvalue references 
though makes no sense imho, and that is my whole point.