从Go中的派生类型调用方法

Question

I have two files, generic_handler.go, which essentially looks like this:

type Handler struct{
    fields map[string]interface{}
}

func (handler *Handler) addField(key string, value interface{}){ some code }

And stat_handler.go:

type StatHandler Handler

When I try to call (from within the stat_handler.go file) the method like this, I get an error:

//inside some function
stathandler.addField("some field", "some value")

It errors out with type StatHandler has no field or method addField. This is the same even if I export addField by making it AddField. Both of these files reside in the same package.

Is there something I am missing?

Answer 1

In Go you'd typically do this through composition:

type StatHandler struct {
    Handler  // Anonymous member of type Handler
}

// ...Later on
var stathandler StatHandler
stathandler.addField("some field", "some value")