As someone who is new to Golang world, I am confused with the following
code.
As sample code shown, type S's "underlying" type is slice (in C++ jargon S
is the derived class of slice), and if I pass a slice as S in function
parameter, it works; but if I pass slice as S in function receiver, Go
doesn't "downcast" it to S.
I do know that S and []int are treated as different types in Go, but as the
append function shows, Go will "upcast" S to slice to use slice.append().
So when should I expect the type casting to work? Or or specific to the
scenario, why it fails if I use slice as the function receiver for S?
> package main
> import (
> "fmt"
> )
> type S []int
>
> func (s S) testUnderlyingTypeAsReciever() {
> fmt.Println("Hello, playground")
> }
> func testUnderlyingTypeAsParam(s S) {
> fmt.Println("Hello, playground")
> }
> func main() {
> d := []int{2}
> s := S{}
> s = append(s, 1) // use append function for slice
> testUnderlyingTypeAsParam(d) // pass
> d.testUnderlyingTypeAsReciever() // fail
> }
--
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.
For more options, visit https://groups.google.com/d/optout.
