On 05/05/2015 04:30 PM, Manfred Nowak wrote:
> On Tuesday, 5 May 2015 at 05:26:17 UTC, anonymous wrote:
>
>> because `c is c`
>
> Thanks. One can see this documented in
> http://dlang.org/operatoroverloading.html#equals
>
> But
> 1: how can one override this behavior
There is now way in D other than changing the implementation:
https://github.com/D-Programming-Language/druntime/blob/master/src/object_.d#L141
(There is also object.di there but I think changing the function above
should be sufficient.)
> 2: what is the design reason for this
I am guessing:
- For correctness, an object should be equal to itself
- Preventing memory errors when the left-hand side object is null.
- Reducing boilerplate
> Especially: how can one implement side effects on invoking `==' or `!='?
>
> -manfred
Can you use a member function instead as in c.eq(c)?
Ali
