如果结构A嵌入在B中，则A上的方法可以访问B的方法吗？

Question

  struct A {}

  func (a *A) BName(id int) string {
     return a.Name
  }

  struct B {
     *A
     Name string
  }

  func main() {
     b := &B{Name: "abc"}
     fmt.Println(b.Name)
  }

the code failure, I want know how to write code to achieve, A.BName can access B struct attribute Name

Answer 1

This is not possible. struct A does not know anything about the types it is embedded into. Think about it, A can be embedded into any other struct, so how could you know ahead of time the type of the struct that A is embedded into.

If you want to do this, you need to place a reference to B, the outer structure into A.

type A struct {
    *B 
}

func (a *A) PrintName() string { return a.B.Name }

type B struct {
    A // no need to use a pointer here
    Name string
}

var b B
b.A.B = &b

fmt.Println(b.PrintName())