指针类型为接收者的方法不会在反射中列出

Question

I was trying to generalize my code by using reflection to call all methods of a type. It's easy and straightforward but there is a problem with that, reflection.TypeOf(T).NumMethods (or other methods) ignores methods which used receiver type as a pointer. For example this small code will print 1 instead of 2:

package main

import (
    "fmt"
    "reflect"
)

type Foo struct {}

func (f Foo) Bar() {}

func (f *Foo) Baz() {}

func main() {
    obj := Foo{}
    fmt.Println(reflect.TypeOf(obj).NumMethod())
}

You can run in playground. It prints 1 because of Bar method. If you delete the pointer (*) from Baz, it will print 2.

My question is how can I list all methods regardless of receiver type.

Thanks

Answer 1

You can just use the pointer of obj to get all Methods:

func main() {
    obj := &Foo{}
    fmt.Println(reflect.TypeOf(obj).NumMethod())
}

playground