接口定义中方法签名中的接口

Question

I want to have something like this:

type MyInterface interface {
    MyMetod(interface{})
}

and to have the type

type MyType struct {}

with method

func (mt *MyType) MyMethod(SomeConcreteType) {
   // body
}

implementing MyInterface.

But it seems that Go can't handle this. I recieve an error that says that it have MyMethod(SomeConcreteType) but it wants MyMethod(interface{}). Why is this so, and what would be a good solution to this problem?

Answer 1

Why is this? It's the language design.

Solution would be to match the interface:

type MyType struct{}

func (mt *MyType) MyMethod(v interface{}) {
    v, ok := v.(SomeConcreteType)
    if !ok {
        panic("!ok")
    }
    v.doStuff()
}