[generics] gRPC bistream quantization

[Denis Cheremisov]

Another question about generics, a HOWTODO one: I am bored to death writing methods what would send one request and get one response from a gRPC bistream. Decided to try a draft 2 against a generic approach to the task.

My final attempt which I still can't compile: https://go2goplay.golang.org/p/z8XUKua3k-J

Where is the mistake?

[andrew....@gmail.com]

Your ReadOne function takes three type parameters: S, Input, and Output. Since S has a constraint, Input and Output also need a constraint (which can just be interface{}).

> func ReadOne(type S Stream(Input, Output), Input interface{}, Output interface{})(...) (...)

I also had to add explicit type arguments to the call to ReadOne since the compiler complains that the type of Output can't be inferred.

> res, err := ReadOne(*dummyStream, int, int)(nil, getStream, 13)

https://go2goplay.golang.org/p/RQEyhRRQb0p

Cheers,

Andrew Ekstedt

[Denis Cheremisov]

Thank you