package main

import (
        "fmt"
)

type Congressman struct {
        Name string
}

func (c Congressman) greet() {
        fmt.Println("Hallo", c.Name)
}

type Enemy struct{}

func (e Enemy) greet() {
        fmt.Println("Go to hell!")
}

// Interface definieren
type Greeter interface {
        greet()
}

// Interface nutzen
func passBy(g1, g2 Greeter) {
        g1.greet()
        g2.greet()
}

func main() {
        // Interface
        c := Congressman{Name: "Frank"}
        e := Enemy{}

        passBy(c, e)
}