Enum

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Enum

Enums defines a common type for a group of related values. If you are familiar with C, you will know that C enumerations assign related names to a set of integer values. Enums in Gravity are much more flexible and enable you to assign any literal value (Int, Float, String, Bool):

    enum state {
        nothing,                // default to 0
        active,                 // default to 1
        inactive,               // default to 2
        undetermined = 666,
        error                   // 667
    }

    enum math {
        pi = 3.141592,
        e = 2.718281,
        goldratio = 1.618033
    }

    enum company {
        ceo = "Gauss",
        cto = "Eurel",
        cfo = "Nostradamus"
    }

    enum mixed {
        one = "Hello World",
        two = 3.1415,
        three = 666,
        four = true
    }

    func main() {
        var a = state.active;    // a = 1
        var b = math.pi;         // b = 3.1415
        var c = company.ceo;     // c = "Gauss"
        var d = mixed.four;      // d = true
    }

Enum is a static operator, which means that at compile time the real value of the enum item is automatically replaced by Gravity.