Non-null objects, the Null Object pattern, and T.init

[Andrei Alexandrescu]

On 1/16/14 6:09 PM, Peter Alexander wrote:
> On Friday, 17 January 2014 at 02:07:08 UTC, deadalnix wrote:
>> Most object don't have a sensible init value. That is just hiding
>> the problem under the carpet.
>
> That's true.
>
> class Widget
> {
>      Widget parent;
>      static Widget init = ???
> }
>
> How do you define init?

Depends on what you want. Could be null or could have itself as a 
parent. The null object pattern is what it is.

Andrei