Consider the following piece of code
type Dog struct {
}
type Walker interface {
Walks()
}
func (d *Dog) Walks() {
}
func CheckWalker(w Walker) {
}
func main() {
dog := Dog{}
CheckWalker(dog) -> cannot use dog (variable of type Dog) as Walker
value in argument to CheckWalker: Dog does not implement Walker (method
Walks has pointer receiver)compilerInvalidIfaceAssign
<https://pkg.go.dev/golang.org/x/tools/internal/typesinternal?utm_source%3Dgopls#InvalidIfaceAssign>
}
When I run this code I get the error as show in the red above
Now consider this piece of code
type Dog struct {
}
func (d *Dog) Walks() {
}
type Bird struct {
}
func (b *Bird) Flys() {
}
type Flyer interface {
Flys()
}
type Walker interface {
Walks()
}
type Combined interface {
Walker
Flyer
}
type Animal struct {
Dog
Bird
}
func CheckCombined(c Combined) {
}
func Check(w Walker) {
}
func main() {
animal := &Animal{}
CheckCombined(animal)
}
This code runs without any error!
Since Animal struct is compose of Dog and Bird (not pointer to them), why
this code is working where as only pointer to Dog and Bird implement the
necessary methods to satisfy the interface Combined ?
--
You received this message because you are subscribed to the Google Groups
"golang-nuts" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to golang-nuts+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/golang-nuts/80a3498b-b1e9-4a30-a55c-ef93a53e89e4n%40googlegroups.com.
