GO Methods 中指针和引用

package main

import (
    "fmt"
)

type Hub struct {
    width, height int
}

func (r Hub) size() int  {
    return r.width * r.height
}

func (r *Hub) bound() int  {
    return r.width * r.height
}

func (r Hub) setX(x int)  {
    r.width = x
}

func (r *Hub) setY(y int)  {
    r.height = y
}

func main()  {
    hub := Hub{width: 1, height: 2}

    fmt.Println(hub)
    fmt.Println(hub.size())
    fmt.Println(hub.bound())

    hub.setX(10)
    hub.setY(20)

    fmt.Println(hub)
    fmt.Println(hub.size())
    fmt.Println(hub.bound())
}

{1 2}
2
2
{1 20}
20
20