Enum

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package main

import (
	"fmt"
)

type Color uint8

const (
	Red = iota
	Green
	Blue
)

func main() {
	fmt.Printf("%04b\n", Red)
	fmt.Printf("%04b\n", Green)
	fmt.Printf("%04b\n", Blue)
}

Flag

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package main

import (
	"fmt"
)

type Color uint8

const (
	Red = 1 << iota
	Green
	Blue
)

func main() {
	var color Color

	color |= Red
	fmt.Printf("%04b\n", color)

	color |= Green
	fmt.Printf("%04b\n", color)

	color &^= Red
	fmt.Printf("%04b\n", color)

	fmt.Printf("%04b\n", Red)
	fmt.Printf("%04b\n", Green)
	fmt.Printf("%04b\n", Blue)
}