Go Interfaces Determining underlying type from interface
Example
In go it can sometimes be useful to know which underlying type you have been passed. This can be done with a type switch. This assumes we have two structs:
type Rembrandt struct{}
func (r Rembrandt) Paint() {}
type Picasso struct{}
func (r Picasso) Paint() {}
That implement the Painter interface:
type Painter interface {
Paint()
}
Then we can use this switch to determine the underlying type:
func WhichPainter(painter Painter) {
switch painter.(type) {
case Rembrandt:
fmt.Println("The underlying type is Rembrandt")
case Picasso:
fmt.Println("The underlying type is Picasso")
default:
fmt.Println("Unknown type")
}
}
