Option!T

[Nick Sabalausky via Digitalmars-d]

On 12/10/2013 12:40 PM, JR wrote:
> On Tuesday, 10 December 2013 at 17:28:26 UTC, Andrei Alexandrescu wrote:
>> We have only(x) (http://dlang.org/phobos/std_range.html#.only) to be a
>> collection of exactly one value, but not a type for "a value of type T
>> or nothing at all".
>
> Is this not what Nullable!T is?

Nullable lacks compile-time enforcement that you handle the "does not 
exist" possibility. It turns it into a run-time issue.