如何取消引用动态多级指针？

Question

I was trying to implement a function to print the structure tree of an interface{} with reflection and DFS.

But I find it's hard to get dereference of a multiple level pointer (NumField()can not be used with a pointer). Just like:

func Tree(i interface{}) {
  ......
}

var a = 10
var b = &a
var c = &b

Tree(c)

In my opinion, maybe:

for reflect.ValueOf(i).Kind() == reflect.Ptr {
    t := i.(reflect.Typeof(i))
    i = *t
}

could work, but it doesn't.

Is there any way to resolve this?

Answer 1

Using reflection you can do this:

rt := reflect.ValueOf(i).Type()
for rt.Kind() == reflect.Ptr {
    rt = rt.Elem()
}

// rt is non-pointer type

https://play.golang.com/p/YbT1p4R3_1u