Binding rvalues to ref parameters redux

[bitwise]

On Monday, 1 April 2019 at 20:17:33 UTC, Timon Gehr wrote:
> On 01.04.19 18:43, bitwise wrote:
>
>> If I had to have my rvalues qualified with const, that would 
>> be fine. To be honest, I don't think I've written any C/C++ 
>> code that casts const away in years, ...
>
> There is no D const in C++.

I meant that if you had a C function that returned a const 
object, you could use D's const in the extern(C) D function 
declaration. If you did that, you could safely cast const away 
from the returned object knowing that it wasn't some immutable 
data in D hiding underneath. Aside from this case, I would 
consider it unnecessary, and in most cases unacceptable, to cast 
const away.

>> ... > As far as using const, I don't really think it's that 
>> bad.
>> 
> Yes, it really is that bad.

Can you provide an example?

    Thanks!