dtv11049 2018-03-29 20:12
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指针类型为接收者的方法不会在反射中列出

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

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2条回答 默认 最新

  • dopii22884 2018-03-29 20:15
    关注

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

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

    playground

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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