Composing in GoLang

composing-in.go

package main

import (
	"fmt"
)

type User struct {
	Name string
}

func (u *User) sayName(speaker string) bool {
	fmt.Printf("Hello %s, my name is %s\n", speaker, u.Name)
	return true
}

type Role interface {
	unlockGate() bool
}

type Admin struct {
	*User
	roleType       string
	SecretPassword string
  entries int32
}

// A method needed by the Role interface. 
func (a *Admin) unlockGate() bool {
  a.entries++
	fmt.Printf("unlocking gate as %s\n", a.Name)
	return true
}

// A function that works on any Role. 
func unlock(r Role) {
	r.unlockGate()
}

func main() {
	
	b := &Admin{&User{"Pancho"}, "administrator", "pa$$word", 0}
	b.sayName("Roberto")

	b.unlockGate()
	unlock(b)

  fmt.Printf("Total entries %d\n", b.entries)

}