将界面{}强制转换为类型

Question

Say I have something like this:

type Foo struct{
   Bar string
}

func Exported (v interface{}){
 // cast v to Foo
}

is there a way to cast v to Foo in the Exported func?

I tried a type assertion like so:

func Exported (v interface{}){

  v, ok := v.(Foo)

  if !ok {
    log.Fatal("oh fuk")
  }

  // but v.Bar is not available here tho ??

}

The problem is that if I try to access v.Bar after the assertion, it doesn't compile.

Answer 1

func main() {
    f := Foo{"test"}
    Exported(f)
}

type Foo struct{
    Bar string
}

func Exported (v interface{}){
    t, ok := v.(Foo)
    if !ok {
        log.Fatal("boom")
    }
    fmt.Println(t.Bar)
}