Using enum types

[Meta]

On Monday, 4 December 2017 at 22:34:41 UTC, helxi wrote:
> Why can't enums be used as types in this (simplified) example?
>
> enum Positivity
> {
> 	Positive,
> 	Negative
> }
>
> struct Wave
> {
> public:
> 	Positivity slope;
> }
>
> enum Waves
> {
> 	Sin = Wave(Positivity.Positive),
> 	Cos = Wave(Positivity.Negative)
> }
>
> int nth_value(T : Waves)(int n);
>
> int nth_value(T : Waves.Sin)(int n)
> {
> 	return n % 2 ? 1 : -1;
> }
>
> int nth_value(T : Waves.Cos)(int n)
> {
> 	return n % 2 ? -1 : 1;
> }

We Adam said, Waves.Sin and Waves.Cos are values, while Waves 
itself is the type. You want to do the following:

int nth_value(Waves w: Waves.Sin)(int n)
{
     //Etc.
}

At least I *think* that's what you want. I'm on mobile and dpaste 
is down so I have no way to double check the syntax, which I can 
never remember.