Question

从下面的示例来看，无论如何，Child对象可以调用Parent的方法吗？例如，我希望孩子（boy1和girl1）打电话给父母＆＃34;记住＆＃34;方法;所以父母可以记住孩子想让他们记住的事。

非常感谢

package main

import "fmt"

type child struct {
    Name string 
}

func (p *child) Yell() {
    fmt.Println("Child's yelling")
}

type parent struct {
    Name string 
    Children []child
    Memory []string
}

func (p *parent) Yell() {
    fmt.Println("Parent's yelling")
}

func (p *parent) Remember(line string) {
    p.Memory = append(p.Memory, line)
}

func main() {
    p := parent{}
    p.Name = "Jon"
    boy1 := child{}
    boy1.Name = "Jon's boy"
    girl1 := child{}
    girl1.Name = "Jon's girl"
    p.Children = append(p.Children, boy1)
    p.Children = append(p.Children, girl1)
    fmt.Println(p)

    p.Yell()
    for i:=0;i<len(p.Children);i++ {
        p.Children[i].Yell()
    }
}

感谢@Jim，这是解决方案。指针总是令人困惑。

package main

import "fmt"

type child struct {
    Name string
    prnt *parent
}

func (p *child) Yell() {
    fmt.Println("Child's yelling")
}

type parent struct {
    Name     string
    Children []child
    Memory   []string
}

func (p *parent) Yell() {
    fmt.Println("Parent's yelling")
}

func (p *parent) Remember(line string) {
    p.Memory = append(p.Memory, line)
}

func main() {
    p := parent{}
    p.Name = "Jon"
    boy1 := child{}
    boy1.Name = "Jon's boy"
    boy1.prnt = &p
    girl1 := child{}
    girl1.Name = "Jon's girl"
    girl1.prnt = &p

    p.Children = append(p.Children, boy1)
    p.Children = append(p.Children, girl1)
    fmt.Println(p)

    p.Yell()
    for i := 0; i < len(p.Children); i++ {
        p.Children[i].Yell()
        p.Children[i].prnt.Remember("test:" + p.Children[i].Name)
    }

    fmt.Println(p.Memory)
}

Answer 1

您可以在子结构中添加指向父级的指针

type child struct {
    Name string
    parent *parent
}

func (p *child) Yell() {
    fmt.Println("Child's yelling")
    p.parent.Remember(p.Name + " called")
    p.parent.Yell()
}

Answer 2

我只是Golang的首发。

似乎Golang约定是CamelCase的类名，当继承时，基类（“Parent”）不应该指定变量名。 p.Parent将自动生效，即如下：

type Child struct {
    *Parent   // put at top
    Name string
}

func (p *Child) Yell() {
    fmt.Println("Child's yelling")
    p.Parent.Remember(p.Name + " called")
    p.Parent.Yell()
}

参考：

http://arch-stable.blogspot.hk/2012/05/golang-call-inherited-constructor.html
https://medium.com/@simplyianm/why-gos-structs-are-superior-to-class-based-inheritance-b661ba897c67

其他一些示例使用非指针Parent继承，如：

type Child struct {
    Parent   // put at top
    Name string
}

不确定哪一个更官方更方便

Golang，打电话给父母＆＃39;方法

2 个答案: