Go中方法参数的继承替代

Question

I understood that Go has no inheritance and works with composition.

Here is my small example:

type Car struct {
    XMLName xml.Name `xml:"response"`
    // some properties coming from a XML file
}

type Audi struct {
    Car
    // some more properties coming from a XML file
}

func UnmarshalFromXML(url string, car *Car) { /* fill the properties from the XML file */ }

What I actually want:

var audi Audi
UnmarshalFromXML("someURL", &audi)

But this does not work, because there is no inheritance. But I need structs to use the unmarshal functionality for XML files.

So what to do?

Answer 1

You could try using interfaces instead

    type Car interface {
       theCar()
    }

    type CarBase struct {
    }

    func (_ CarBase) theCar() {
    }

    type Audi struct {
      CarBase
    }

    func UnmarshalFromXML(url string, car Car)