<3> go 枚举

[code]// 实现枚举例子

type State int

// iota 初始化后会自动递增
const (
    Running State = iota // value --> 0
    Stopped              // value --> 1
    Rebooting            // value --> 2
    Terminated           // value --> 3
)

func (this State) String() string {
    switch this {
    case Running:
        return "Running"
    case Stopped:
        return "Stopped"
    default:
        return "Unknow"
    }
}

func main() {
    state := Stopped
    fmt.Println("state", state)
}
// 输出 state Running
// 没有重载String函数的情况下则输出 state 0