On Monday, March 21, 2022 at 3:29:44 PM UTC+8 Henry wrote:
> Perhaps something like this?
> ```go
> func Convert[T, A any](src []T, converter func(T) A) []A {
> result := make([]A, len(src))
> for index, a := range src {
> result[index] = converter(a)
> }
> return result
> }
> ```
> See https://play.golang.com/p/rq89Wposc-D
>
It might reduce some code (surely not eliminate), but it is very ungraceful.
The current constraint design lacks of two abilities:
1. The ability of specifying a type argument must be an interface type.
2. The ability of specifying a type argument must not be an interface type.
I except an implementation like
func ConvertSlice[From implements(To), To interface](vs []From) []To {
var r = make([]To, len(vs))
for i := range vs {
r[i] = vs[i]
}
return r
}
>
>
> On Sunday, March 20, 2022 at 11:36:27 PM UTC+7 tapi...@gmail.com wrote:
>
>>
>>
>> package main
>>
>> type A interface {
>> Ma()
>> }
>>
>> type B interface {
>> Mb()
>> }
>>
>> type Ta struct { A }
>>
>> type Tb struct { B }
>>
>> func ConvertSliceToA[From A](vs []From) []A {
>> var r = make([]A, len(vs))
>> for i := range vs {
>> r[i] = vs[i]
>> }
>> return r
>> }
>>
>> func ConvertSliceToB[From B](vs []From) []B {
>> var r = make([]B, len(vs))
>> for i := range vs {
>> r[i] = vs[i]
>> }
>> return r
>> }
>>
>> func main() {
>> var x [100]Ta
>> var _ = ConvertSliceToA(x[:])
>>
>> var y [100]Tb
>> var _ = ConvertSliceToB(y[:])
>> }
>>
>
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