在golang中將struct方法作爲回調函數傳遞

Question

是否可以在struct中將方法傳遞爲golang中的回調函數？

E.g.註冊消息處理程序：

func (mc MQTTClient) MessageHandler(client MQTT.Client, msg MQTT.Message) { 
    fmt.Printf("TOPIC: %s\n", msg.Topic()) 
    fmt.Printf("MSG: %s\n", msg.Payload()) 
} 

func (mc MQTTClient) AddMessageHandler(){ 
    //.. 
    //subscribe to the topic /go-mqtt/sample and request messages to be delivered 
    //at a maximum qos of zero, wait for the receipt to confirm the subscription 

    if token := c.Subscribe("go-mqtt/sample", 0, mc.MessageHandler); token.Wait() && token.Error() != nil { 
        fmt.Println(token.Error()) 
        os.Exit(1) 
    } 
} 

非常感謝！

Answer 1

你寫什麼似乎是正確的。

Answer 2

Golang擁有一流的功能，你可以將它們作爲參數https://golang.org/doc/codewalk/functions/ 你可能也想看看這個https://dave.cheney.net/2016/11/13/do-not-fear-first-class-functions