golang-polymorphism

golang-polymorphism.go

// https://play.golang.org/p/CpPW7CxYBV

package main

import (
	"fmt"
)

type A struct {
	X string
}

func (a *A) hi() {
	fmt.Println(a.X)
}

type B struct {
	A
	Y string
}

func (b *B) hi() {
	fmt.Println(b.Y)
}

type C struct {
	A
	Y string
}

type Hi interface {
	hi()
}

func say(hi Hi) {
	hi.hi()
}

func main() {
	a := &A{X: "X in a"}
	say(a)
	b := &B{Y: "Y in b"}
	b.X = "X in b"
	say(b)
	c := C{}
	c.X = "X in c"
	say(&c)
}

// X in a
// Y in b
// X in c