Go の Enum

iota で Stringer な Enum はこんな感じだろうか。

package main

import (
    "log"
)

func init() {
    log.SetFlags(log.Lshortfile)
}

type Indexing int

func (i Indexing) String() string {
    switch i {
    case WITH:
        return "WITH"
    case WITHOUT:
        return "WITHOUT"
    case NEVER:
        return "NEVER"
    }
    log.Fatal("can't be here")
    return ""
}

const (
    WITH Indexing = iota
    WITHOUT
    NEVER
)

func main() {
    log.Println(WITH, WITHOUT, NEVER)
}