You can do this with type-list interfaces:
https://go2goplay.golang.org/p/wfHnVHOMcyK
This is one of the harder parts of the proposal to understand IMHO, but
perhaps it will become easier with familiarity.
On Tue, 5 Jan 2021, 17:32 Brian Candler, <b.cand...@pobox.com> wrote:
> Question: how to make a generic function which takes a type T where the
> constraint is "*T satisfies a given interface"?
>
> func (m *MyMap[KT, VT]) init() {
> m.data = make(map[KT]VT)
> }
>
> type Initializer interface {
> init()
> }
>
> func mynew[T Initializer]() *T {
> t := new(T)
> t.init()
> return t
> }
>
> /* or:
> func mynew[T Initializer]() *T {
> var t T
> t.init()
> return &t
> }
> */
>
> func main() {
> m := mynew[MyMap[string, int]]()
> }
>
> gives:
>
> type checking failed for main prog.go2:34:13: MyMap[string, int] does not
> satisfy Initializer: wrong method signature
> got func (*MyMap[KT, VT]).init()
> want func (Initializer).init()
>
> Full code: https://go2goplay.golang.org/p/INcenfcInSl
>
>
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