go-pointer

要点

  • 在访问filed时,pointer to struct会自动解引用

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    type person struct {
        name string
    }
    p := &person{"a"}
    p.name // <=> (*p).name

  • 在调用method时,struct(reciver)会自动转换(取地址,解引用)

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    type Dog struct {
        name string
    }

    func (d Dog) Bite(target string) {
        fmt.Printf("%v bite %v\n", d.name, target)
    }

    func (d *Dog) Drink(target string) {
        fmt.Printf("%v drink %v\n", d.name, target)
    }

    func main() {
        a := Dog{"a"}
        b := &Dog{"b"}
        a.Bite("b")
        b.Bite("a") // <=> (*b).Bite("a")

        a.Drink("water") // <=> (&a).Drink("water")
        b.Drink("beer")  //
    }

  • function参数不会转换

参考

  1. http://stackoverflow.com/questions/20849751/rule-for-go-pointers-references-dereferencing

留言

2015-10-28
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