Is the other-kind-of-null really necessary in Nullable and Variant?

deadalnix deadalnix at gmail.com
Mon Apr 29 09:12:51 PDT 2013


On Monday, 29 April 2013 at 15:34:30 UTC, Idan Arye wrote:
> On Monday, 29 April 2013 at 12:23:04 UTC, deadalnix wrote:
>> On Sunday, 28 April 2013 at 16:33:19 UTC, Idan Arye wrote:
>>> When you use `std.typecons.Nullable` with a type that already 
>>> accept `null` values, you get two types of nulls - the 
>>> `Nullable`'s null state the the regular type's `null`:
>>>
>>>   Nullable!string a;
>>>   writeln(a.isNull()); //prints "true"
>>>   a = null;
>>>   writeln(a.isNull()); //prints "false"
>>>   a.nullify();
>>>   writeln(a.isNull()); //prints "true"
>>>
>>
>> All types should be non nullable. Problem solved.
>
> *All* types? Even object references and pointers?

Especially object references and pointers.


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