Nullable instantiator anyone?

[bearophile via Digitalmars-d-learn]

Nordlöw:

> I'm missing an instantiator function for std.typecons:Nullable. 
> Is this is intentional? If not, is this
>
> Nullable!T nullable(T)(T a)
> {
>     return typeof(return)(a);
> }
>
> sufficient for our needs?

It could be sufficient, but note that in Phobos there are two 
different versions of Nullable, one of them doesn't require extra 
memory, it uses one value as the "null" value.

Bye,
bearophile