April 2012
1 post
[]T is not []I
It’s bothered me for a while now that in Go I can’t assign a []T to an []I, where T is a concrete type implementing the I interface. But recently I learned of a very good reason. Consider this code:
type Shape interface {
Area() int
}
type Circle interface {
Area() int
Radius() int
}
type Square interface {
Area() int
Width() int
Height() int
}
func main() {
var circles...
