While this would make some things much easier for me, it seems this would
be a pretty fundamental change. Constraints are essentially interfaces and
interfaces in Go are defined by behaviors. Structs, on the other hand, are
defined by properties. There is no behavior that all structs have that
every other type couldn't also have. Thus having a struct constraint would
be a one-off exception which for the most part seems anathema to Go. In a
similar vein, there are many times I'd like an interface to require certain
exported properties in addition to behaviors, but this isn't going to
happen.
On Wednesday, March 27, 2024 at 6:28:19 PM UTC-6 Makis Maropoulos wrote:
> Same here @Abraham,
>
> ResponseType interface {
> ~struct{}
> }
>
> Obviously this doesn't work, I would love to see it working though.
> On Wednesday 14 September 2022 at 17:48:19 UTC+3 Abraham wrote:
>
>> I am glad I found this thread because I was just now breaking my head
>> figuring out why my <struct constraint> was not working....
>>
>> On Wednesday, May 18, 2022 at 10:41:29 PM UTC-4 Ian Lance Taylor wrote:
>>
>>> On Wed, May 18, 2022 at 7:36 PM Jeremy Kassis <jka...@gmail.com> wrote:
>>> >
>>> > Where exactly did this land? Seems like an important conversation...
>>>
>>> To date there is no way to write a constraint that requires that a
>>> type argument be a struct type.
>>>
>>>
>>> > ```
>>> > // RPCHandler passes RPCReq and RPCRes as fn args
>>> > func RPCHandler[T RPCReq, S RPCRes](fn func(T, S)) http.HandlerFunc {
>>> > return func(w http.ResponseWriter, r *http.Request) {
>>> > req := T{}
>>> > if err := reqBodyReadAll(w, r, &req); err != nil {
>>> > resWriteErr(w, err)
>>> > return
>>> > }
>>> > res := S{}
>>> > fn(req, res)
>>> > resWriteAll(w, r, res)
>>> > }
>>> > }
>>> > ```
>>>
>>> I would write simply "var req T" and "var res S".
>>>
>>> Ian
>>>
>>
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