Types, Structs, and Enums

Flint includes primitive numeric and boolean types, user-defined structs, and enums used as tagged unions.

Structs

Structs group fields together:

struct Sensor {
    pin: u8,
    offset: f32,
}

Enums represent one of several variants:

enum Command {
    Read(pin: u8),
    Write(pin: u8, value: bool),
    Reset,
}

This form is especially important for protocol parsing, driver state, and result-oriented programming.

Enums become much more useful together with match:

match cmd {
    Command.Read(pin) => { return ok(pin) }
    Command.Write(pin, value) => { return ok(pin) }
    Command.Reset => { return ok(0) }
}

Flint uses tagged unions as a normal language tool, not as a niche feature.