field_promotion.go

field_promotion.go

package main

import "fmt"

type Original struct {
	foo string
	bar string
}

func (o *Original) Foo() string {
	return o.foo
}

func (o *Original) Bar() string {
	return o.bar
}

type Extended struct {
	Original
}

func (o *Extended) Bar() string {
	return "woot"
}

func main() {
	o := Original{foo: "foo", bar: "bar"}
	e := Extended{Original: o}

	fmt.Printf("%+v\n", o) // {foo:foo bar:bar}
	fmt.Printf("%+v\n", e.Bar()) // woot
}