Go 常用的接口断言操作 ！

Question

iris框架里面的mvc有段代码：https://github.com/kataras/iris/blob/master/mvc/mvc.go#L291

var (
	_ BeforeActivation = (*ControllerActivator)(nil)
	_ AfterActivation  = (*ControllerActivator)(nil)
)

if before, ok := controller.(interface {
	BeforeActivation(BeforeActivation)
}); ok {
	before.BeforeActivation(c)
}

Answer 1

用来判断一个对象有没有实现某个方法确实挺巧妙的