Nothing type/value aka Unit

[Alex]

On Friday, 8 February 2019 at 13:33:23 UTC, Jonathan Levi wrote:
> Here is Sodium's GitHub page: 
> https://github.com/SodiumFRP/sodium

So... you want to return something, and void is not possible?

What about something like this:

´´´
import std.experimental.all;

void main() @nogc
{
     S!(typeof(null)) s;
     auto res1 = s.fun1;
     auto res2 = s.fun2;

     debug
     {
         writeln(res1);
         writeln(res2);
         writeln(unit);
     }
}

struct Unit {}
enum Unit unit = Unit.init;

struct S(T)
{
     T val;

     auto fun1()
     {
         return val;
     }

     auto fun2()
     {
         return tuple();
     }
}
´´´