Go - Paksa antara muka untuk berpuas hati hanya dengan jenis dengan penerima penunjuk pada kaedah?

package main import ( "encoding/json" "fmt" "log" ) type PingParams struct { Name string } type PingResponse struct { Message string } func (p PingParams) Greeting() string { if p.Name != "" { return fmt.Sprintf("Hello, %s", p.Name) } return fmt.Sprintf("Hello, nobody!") } type GoodPing struct { Params PingParams } // SetParams has a pointer receiver. func (m *GoodPing) SetParams(p PingParams) { fmt.Printf("assign %v with pointer receiver, Good!\n", p) m.Params = p } func (m GoodPing) Run() (*PingResponse, error) { return &PingResponse{Message: fmt.Sprintf("%T %s", m, m.Params.Greeting())}, nil } type BadPing struct { Params PingParams } // SetParams has a value receiver. func (m BadPing) SetParams(p PingParams) { fmt.Printf("assign %v with value receiver, Bad!\n", p) m.Params = p } func (m BadPing) Run() (*PingResponse, error) { return &PingResponse{Message: fmt.Sprintf("%T %s", m, m.Params.Greeting())}, nil } type Method[M, RQ, RS any] interface { // Run builds the RPC result. Run() (*RS, error) // SetParams is intended to set the request parameters in the struct implementing the RPC method. // This then allows the request parameters to be easily available to all methods of the Method struct. // The method MUST have a pointer receiver. This is NOT enforced at compile time. SetParams(p RQ) // The following line requires the implementing type is a pointer to M. *M // https://stackoverflow.com/a/72090807 } func HandlerMethod[M, RQ, RS any, T Method[M, RQ, RS]](in json.RawMessage) (*RS, error) { // A real implementation of this would return a func for wiring into a request router var req RQ err := json.Unmarshal(in, &req) if err != nil { return nil, err } var m T = new(M) m.SetParams(req) return m.Run() } func main() { payload := []byte(`{"Name": "Mark"}`) bad, err := HandlerMethod[BadPing, PingParams, PingResponse](payload) if err != nil { log.Fatal(err) } fmt.Println(bad.Message) good, err := HandlerMethod[GoodPing, PingParams, PingResponse](payload) if err != nil { log.Fatal(err) } fmt.Println(good.Message) }

var m T = new(M)