On Thu, Jun 18, 2020, 11:28 T L <tapir....@gmail.com> wrote:
> How to declare a generic functions which converting a slice with type Ta
> to a slice with type Tb. Like
> func ConvertSlice(type Ta, Tb constraint)(ins []Ta) []Tb {...}
>
> How to constraint a type parameter must be of an interface type?
>
I don't think you can. Why would you need to? Note that there will always
be constraints that you can't express.
> Is it possible to define generic unnamed types?
>
No. It also would be useless. You can't refer to a generic, uninstantiated
type. So a generic type either needs a name to be referred by to
instantiate it, or be instantiated right immediately in its declaration
(and thus wouldn't need to be generic).
If it is impossible, then how to define a generic map type which elements
> must be an unnamed integer slice?
>
type numeric interface {
type int, int8, int16, int32, ...
}
type MyMap(type K comparable, T numeric) map[K][]T
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