Found https://github.com/golang/go/issues/23796
On Tue, Jan 12, 2021 at 10:05 PM Henry <henry.adisuma...@gmail.com> wrote:
> I remember reading some proposals about it somewhere, either here at
> golang-nuts or at github. The general consensus was no, because interface
> is all about behavior. Struct is for data and interface is for behavior, or
> something like that if I remember it correctly.
>
> In your specific example, since PrintID requires only the ID field, you
> can refactor it into something like this:
> ```
> func Print(str string) {
> fmt.Println(id)
> }
>
> Print(x.ID)
> Print(y.ID)
> ```
> I hope it helps.
>
> Henry
> On Wednesday, January 13, 2021 at 8:34:00 AM UTC+7 Dave Protasowski wrote:
>
>> I'm doing some due-diligence and wondering if there's any old topics
>> about extending interfaces to support field sets.
>>
>> ie.
>> type WithID interface {
>> ID string
>> }
>> type X struct { ID string }
>> type Y struct { ID string }
>> func PrintID(item WithID) {
>> fmt.Println(item.ID)
>> }
>>
>> In the above the PrintID function only accepts structs with a field named
>> `ID` - which X & Y satisfy. This is sort of like duck typing but with
>> fields.
>>
>> I've found
>> https://groups.google.com/g/golang-nuts/c/18gH5TR_3ZE/m/9dyyT4veBgAJ but
>> I don't know the discussion the person was referencing and it seems
>> specific to generics.
>>
>> thanks,
>> dave
>>
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