oop - Go中扩展类型的访问方法

Question

以下代码生成“prog.go:17: c.Test undefined (type Child has no field or method Test)”。 ( http://play.golang.org/p/g3InujEX9W )

package main

import "fmt"

type Base struct {
    X int
}

func (b Base) Test() int {
    return b.X
}

type Child Base

func main() {
    c := Child{4}
    fmt.Println(c.Test())
}

我意识到 Test 在技术上是在 Base 上定义的，但是 Child 应该继承那个方法吗？

Answer 1

在 go 中实现继承的方法是使用 struct embedding 和 anonymous struct members。 Here is an adaption of your example .

阅读结构嵌入和 Go 的继承方法等 here

您遇到的行为符合预期并与 golang specification 同步，其中明确指出:

The method set of any type T consists of all methods with receiver type T. The method set of the corresponding pointer type *T is the set of all methods with receiver *T or T (that is, it also contains the method set of T). Further rules apply to structs containing anonymous fields, as described in the section on struct types. Any other type has an empty method set.