如何将一个reflect.Type转换为它的ptr类型？

Question

I have one reflect.Type and I need to call MethodByName . If the method is defined on type T , no problem to find it. If it's defined on *T , this mehtod will return invalid value. So I tried to convert T to *T and failed. Here is what I do:

First, I tried to create a new value from the type. Type infomation seems to lost after creation.

t := reflect.TypeOf(src) // src is interface{} type
mt, exists := t.MethodByName(name)
if !exists {
    el := reflect.New(t)
    t = reflect.TypeOf(el)
    mt, exists = t.MethodByName(name)
    fmt.Println(t, mt, exists)
}

Then, I tried to get type directly from src(the interface type), and failed also.

t := reflect.TypeOf(src)
mt, exists := t.MethodByName(name)
if !exists {
    t = reflect.TypeOf(&src) // *interface{} type, not what I want
    mt, exists = t.MethodByName(name)
    fmt.Println(t, mt, exists)
}

Answer 1

reflect.New() returns a value of type reflect.Value() . If you pass this to reflect.TypeOf() , that will be the descriptor of reflect.Value , not your *T .

Simply call Value.Type() from the value returned by reflect.New() :

el := reflect.New(t)
t = el.Type()
mt, exists = t.MethodByName(name)
fmt.Println(t, mt, exists)