Nothing type/value aka Unit
JN
666total at wp.pl
Fri Feb 8 14:41:16 UTC 2019
On Friday, 8 February 2019 at 13:32:22 UTC, Jonathan Levi wrote:
> In D what would be the most appropriate type for a value that
> specifically does not carry a value?
>
> I am working on porting Sodium, a simple FRP library, to D (or
> making one like it). In FRP, events (aka event occurrences)
> must contain 1 and only 1 value. So when there is no
> appropriate value, they make its value what they call a Unit.
>
> For the java version of Sodium they define the unit like `enum
> Unit { UNIT }`. In Haskell when this thing is needed `()` is
> used (an empty tuple).
>
> Is there a more appropriate way to do this in D? Perhaps in
> Phobos?
>
> What makes more sense then `enum Unit { unit }` to me is
> `struct Unit {}; enum Unit unit;`.
how about Nullable!Event?
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