go - 在 golang 中将结构上的方法作为回调传递

Question

是否可以在 golang 中将方法作为回调函数传递给结构体？

例如注册消息处理程序:

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)
  }
}

非常感谢!

Answer 1

Golang 有一流的功能，你可以将它们作为参数传递 https://golang.org/doc/codewalk/functions/ 您可能还想看看这个 https://dave.cheney.net/2016/11/13/do-not-fear-first-class-functions