package main

import (
    "fmt"
    "unsafe"
)

type user struct {
    name  string
    email string
}

func (u user) notify() {
    fmt.Printf("Address in Value Receiver %vn", unsafe.Pointer(&u))
    fmt.Printf(" Sending %s an email at %sn", u.name, u.email)
}

func (u *user) changeEmail(email string) {
    fmt.Printf("Address in Pointer Receiver %vn", unsafe.Pointer(&u))
    u.email = email
}

func main() {
    u := user{
        name:  "mike",
        email: "mike@gmail.com",
    }
    fmt.Printf("Address in Main %vn", unsafe.Pointer(&u))
    u.notify()
    u.changeEmail("john@gmail.com")
    u.notify()
}

Address in Main **0x2081a0020**
Address in Value Receiver 0x2081a0060
Sending mike an email at mike@gmail.com
Address in Pointer Receiver **0x2081cc020**
Address in Value Receiver 0x2081a0080
Sending mike an email at john@gmail.com