From slices to perfect imitators: opByValue

[Sönke Ludwig via Digitalmars-d]

Am 08.05.2014 18:10, schrieb Timon Gehr:
> On 05/08/2014 06:02 PM, monarch_dodra wrote:
>>
>> If you have const data referencing mutable data, then yes, you can cast
>> away all the const you want, but at that point, it kind of makes the
>> whole "const" thing moot.
>
> This is not guaranteed to work. I guess the only related thing that is
> safe to do is casting away const, but then not modifying the memory.

For what practical reason would that be the case? I know that the spec 
states "undefined behavior", but AFAICS, there is neither an existing, 
nor a theoretical reason, why this should fail:

int* i = new int;
const(int)* j = i;
int* k = cast(int*)j;
*k = 0;

Anyway this is going pretty much off topic...