Hi,
You would need to manually convert []implementation to []data. See
https://play.golang.org/p/DdC8sEGi75-
On Wednesday, October 31, 2018 at 5:21:29 AM UTC+7, Yuri Shafet wrote:
>
> Hello, everyone.
> Consider following code:
>
> package main
> import "fmt"
>
> type implementation struct {
> d []int}
>
> func (impl *implementation) getData() interface{} {
> return impl.d}
>
> type phase struct{}
>
> type data interface {
> getData() interface{}}
>
> func MakeIntDataPhase() *phase {
> return &phase{}}
>
> func (p *phase) run(population []data) []data {
> return nil}
>
> func main() {
> var population []implementation
> MyPhase := MakeIntDataPhase()
> fmt.Println(MyPhase.run(population))
> }
>
>
> When running following code in playground I got following error:
> prog.go:30:25: cannot use population (type []implementation) as type []data
> in argument to MyPhase.run
>
> If I understand correctly it is because slice of interface type cannot be
> converted by the compiler to concrete type.
>
>
> What is correct way in golang to implement functionality that is presented in
> the example?
>
> When method argument defined using a slice of some interface, how I can pass
> it a slice of a concrete type that implements the interface?
>
>
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