这些功能在golang中有什么区别？

Question

I'm new to Go programming and wondering what's the difference (if any) there between

a.

func DoSomething(a *A) {        
      b = a
}

b.

func DoSomething(a A) {     
    b = &a
}

Answer 1

If you are actually asking what the difference of those b's are, one is a pointer to the object passed as an argument to DoSomething, and the other is a pointer to a copy of the object passed as an argument to DoSomething.

https://play.golang.org/p/ush0hDZsdE

type A struct {
    f string
}

func DoSomethingPtr(a *A) {
    b := a
    b.f = "hi"
}

func DoSomething(a A) {
    b := &a
    b.f = "hey"
}

func main() {
    x := A{"hello"}
    DoSomething(x)
    fmt.Println(x)
    DoSomethingPtr(&x)
    fmt.Println(x)
}