interfaces_code_snippet_05.go

type toaster interface {
	toast()
}

type acmeToaster struct {}

func (a *acmeToaster) toast() { fmt.Println("Commencing toasting of bread...") }

func doToast(t toaster) {
	t.toast()
}

func maybeDoToast(i interface{}) {
	if t, ok := i.(toaster); ok {
		t.toast()
	}
}

func main() {
	t := new(acmeToaster)
	doToast(t) // Prints "Commencing toasting of bread..."
	maybeDoToast(t) // Prints "Commencing toasting of bread..."
}