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)
}