从接口去获取指向结构体的指针？

Question

Given an interface, how do I obtain a pointer to the underlying value? 给定一个接口，我如何获得指向基础值的指针？

My naive attempt was to use a type assertion like this: 我天真的尝试是使用这样的类型断言：

var mytypeptr *MyType = myinterface.(*MyType)

But I get: 但是我得到：

interface conversion: MyInterface is MyType, not *MyType

Answer 1

You could start with, using reflect.Indirect() : 您可以使用reflect.Indirect() ：

val := reflect.ValueOf(myinterface)
if val.Kind() == reflect.Ptr {
    val = reflect.Indirect(val)
}