Re: Using enum types

[Meta via Digitalmars-d-learn]

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.