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??? ??? ???? ??????? ???? ??? ??{}
? ??? ?? Golang ??? ??? ???? Go?? ?????? ???? ???? ???? ??? ??????{}

??? ??? ???? Go?? ?????? ???? ???? ???? ??? ??????{}

Dec 02, 2024 am 01:39 AM

How to Dynamically Call Methods on an interface{} in Go, Regardless of Receiver Type?

??? ??? ???? ??????? ???? ??? ??{}

Go? ??? ??? ????? ????? ??? ??? ???. ??? ??? ??? ?? ??????? ???? ???? ??? ? ??? ?????.{} ?? ??? ??? ???? ????? ???? ????? ?? ???? ?????{}.

?? ??

??? ?????. ??:

type Test struct {
    Start string
}

func (t *Test) Finish() string {
    return t.Start + "finish"
}

func Pass(i interface{}) {
    _, ok := reflect.TypeOf(&i).MethodByName("Finish")
    if ok {
        fmt.Println(reflect.ValueOf(&i).MethodByName("Finish").Call([]reflect.Value{})[0])
    } else {
        fmt.Println("Pass() fail")
    }
}

func main() {
    i := Test{Start: "start"}

    Pass(i)
    _, ok := reflect.TypeOf(&i).MethodByName("Finish")
    if ok {
        fmt.Println(reflect.ValueOf(&i).MethodByName("Finish").Call([]reflect.Value{})[0])
    } else {
        fmt.Println("main() fail")
    }
}

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  • ???? ??? ??(main())? ?? ?? ??? ??? ?????.
  • ???? ?????(Pass())? ???? ???? ? ???? "Pass() ??"? ?????. call.

??

??? ?????? ??? ???? ??? ????? ? ????{}. ????? ???? ???? &i ??? ? ??????? ???? ????.

???

? ??? ????? ??? ?? ????? ???? ???.

  1. ?????{} ???? ???, ??? ???? value:

    • ???? ?? ?? ?? ?? ?? ???? ????.

  2. ?????{} ???? ?????? ? ? ??? ???:

    • ?? ?? ???? ?? ???.

  3. ?????{} ???? ????, ??? ???? ???:

    • ???? ???? ?? ?? ???? ???? ?? ?????. to.

  4. interface{} ???? ????, ??? ???? ???? ??:

    • ??? ??

??

? ??? ???? ???? ???? ???? ???? ??? ??? ? ????.

func CallMethod(i interface{}, methodName string) interface{} {
    // Handle all scenarios
    var ptr, value, finalMethod reflect.Value
    value = reflect.ValueOf(i)
    if value.Type().Kind() == reflect.Ptr {
        ptr = value
        value = ptr.Elem()
    } else {
        ptr = reflect.New(reflect.TypeOf(i))
        temp := ptr.Elem()
        temp.Set(value)
    }

    // Check for method on value and pointer
    method := value.MethodByName(methodName)
    if method.IsValid() {
        finalMethod = method
    }
    method = ptr.MethodByName(methodName)
    if method.IsValid() {
        finalMethod = method
    }

    // Call the method
    if (finalMethod.IsValid()) {
        return finalMethod.Call([]reflect.Value{})[0].Interface()
    }

    // Method not found
    return ""
}

?? ? ??? ???? ??? ?? ? ?????? ???? ???? ???? ??? ? ????.{} ??:

i := Test{Start: "start"}
j := Test{Start: "start2"}

fmt.Println(CallMethod(i, "Finish"))
// Output: startfinish
fmt.Println(CallMethod(&i, "Finish"))
// Output: startfinish
fmt.Println(CallMethod(i, "Another"))
// Output:
fmt.Println(CallMethod(&i, "Another"))
// Output: start2another
fmt.Println(CallMethod(j, "Finish"))
// Output: startfinish
fmt.Println(CallMethod(&j, "Finish"))
// Output: start2finish
fmt.Println(CallMethod(j, "Another"))
// Output:
fmt.Println(CallMethod(&j, "Another"))
// Output: start2another

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