[Go言語] constとiota面白い ref: http://qiita.com/tenntenn/items/0a3af58b225eeae29088

file0.txt

package main

import "fmt"

const (
    a = iota
    b
    c
)

func main() {
    fmt.Println(a, b, c)
}

file1.txt

package main

import "fmt"

type flag uint
const (
    flag1 flag= iota << 1
    flag2
    flag3
    flag4
    bits = iota - 1
    mask = 1<<bits - 1
)

func main() {
    fmt.Printf("%b, %b, %b, %b, %d, %b", flag1, flag2, flag3, flag4, bits, mask)
}