Golang常量枚举用法详解

const (
    StatusPending = iota // 0
    StatusRunning        // 1
    StatusCompleted      // 2
    StatusFailed         // 3
)

func StatusToString(status int) string {
    switch status {
    case StatusPending:
        return "Pending"
    case StatusRunning:
        return "Running"
    case StatusCompleted:
        return "Completed"
    case StatusFailed:
        return "Failed"
    default:
        return "Unknown"
    }
}

var statusNames = []string{"Pending", "Running", "Completed", "Failed"}

func StatusToString(status int) string {
    if status = len(statusNames) {
        return "Unknown"
    }
    return statusNames[status]
}

type Status int

const (
    StatusPending Status = iota
    StatusRunning
    StatusCompleted
    StatusFailed
)

func (s Status) String() string {
    names := []string{"Pending", "Running", "Completed", "Failed"}
    if s  StatusFailed {
        return "Unknown"
    }
    return names[s]
}