英文:
why is this method definition syntax accepted in Go?
问题
代码部分的翻译如下：
package main
import "fmt"
type unimplementedGreeterServer struct {
}
func (unimplementedGreeterServer) SayHello() string {
return "hello"
}
func main() {
s := &unimplementedGreeterServer{}
ret := s.SayHello()
fmt.Println(ret)
}
结果部分的翻译如下：
hello
问题部分的翻译如下：
为什么SayHello方法没有unimplementedGreeterServer指针或unimplementedGreeterServer接收器也能运行？
我认为正确的写法应该是：
func (s unimplementedGreeterServer) SayHello2() string {
return "hello"
}
func (s *unimplementedGreeterServer) SayHello3() string {
return "hello"
}
而不是：
func (unimplementedGreeterServer) SayHello() string {
return "hello"
}
英文:
the code
package main
import "fmt"
type unimplementedGreeterServer struct {
}
func (unimplementedGreeterServer) SayHello() string {
return "hello"
}
func main() {
s := &unimplementedGreeterServer{}
ret := s.SayHello()
fmt.Println(ret)
}
the result
hello
the question :
why the SayHello method has no unimplementedGreeterServer point or unimplementedGreeterServer receiver can run
I think the right will be
func (s unimplementedGreeterServer) SayHello2() string {
return "hello"
}
func (s *unimplementedGreeterServer) SayHello3() string {
return "hello"
}
not
func (unimplementedGreeterServer) SayHello() string {
return "hello"
}
答案1
得分: 3
接收器本身是可选的。如果方法不使用接收器，可以省略它。下面的声明：
func (unimplementedGreeterServer) SayHello() string {
return "hello"
}
只是定义了一个不使用接收器的unimplementedGreeterServer方法。它是为值接收器定义的，因此它适用于unimplementedGreeterServer和*unimplementedGreeterServer。
英文:
The receiver itself is optional. If the method does not use the receiver, you can omit it. The declaration:
func (unimplementedGreeterServer) SayHello() string {
return "hello"
}
simply defines a method for unimplementedGreeterServer that does not use the receiver. It is defined for a value receiver, so it is defined for unimplementedGreeterServer and *unimplementedGreeterServer.
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