如何将父类型转换为子类型

Question

Given the following types:

type (
    Parent struct {
        name string
        surname string
    }

    Child struct {
        *Parent
        sport String
    }
)

...

func (p *Parent) GetSport() string {
   return ((*Child)(p)).sport // does not work
}

How do I convert *Parent to *Child?

Answer 1

func (p *Parent) Convert() *Child {
   return &Child{p, ""}
}

https://play.golang.org/p/saGvRu_rIk

The problem is there’s no data about sport. So we have to put empty line.