I am learning go lang and i was wondering if there is a way to do something like this:
type Foo struct {
...
}
type Bar struct {
Foo
...
}
func getFoo() Foo {
return Bar{...}
}
In an object oriented language, such code should work without problems, but in go it throws me an error, saying that getFoo() must return an instance of class Foo.
Is there a way to do polymorphism similar to what i've described in Go?
Go is not a typical OO language. Also each language has it own way of doing things. You can use interface and composition to achieve what you desire to, as shown below:
package main
import "fmt"
type Foo interface {
printFoo()
}
type FooImpl struct {
}
type Bar struct {
FooImpl
}
type Bar2 struct {
FooImpl
}
func (f FooImpl)printFoo(){
fmt.Println("Print Foo Impl")
}
func getFoo() Foo {
return Bar{}
}
func main() {
fmt.Println("Hello, playground")
b := getFoo()
b.printFoo()
}