Untitled

Flags- and non-flags-variant of an enum
enum Color { Red, Blue, Green }

[Flags]
enum Colors {
    None = 0,
    Red = 1,
    Blue = 2,
    Green = 4
}

// use cases
Color currentColor;
Colors supportedColors;

Colors currentColor; // ugly, since neither "None" nor "Red | Blue" should be valid

enum Colors = Flag set of Color;

var flags = (Color)47; // why not

bool IsColorValid(Color color)
{
    return (color != 0 && (color & (color - 1)) == 0);
}