Hi All,
(S(d)).testUnderlyingTypeReciever()
Regards
El miércoles, 8 de noviembre de 2017, 18:44:36 (UTC-3), Haiyu Zhen escribió:
>
> 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
>> }
>
>
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