Go中的多态性-是否存在？

Question

I am trying to make something real simple on Go: to have an interface with getter and setter methods. And it seems setter methods are not allowed.

Given this code:

package main

import "fmt"

type MyInterfacer interface {
    Get() int
    Set(i int)
}

type MyStruct struct {
    data int
}

func (this MyStruct) Get() int {
    return this.data
}

func (this MyStruct) Set(i int) {
    this.data = i
}

func main() {
    s := MyStruct{123}
    fmt.Println(s.Get())

    s.Set(456)
    fmt.Println(s.Get())

    var mi MyInterfacer = s
    mi.Set(789)
    fmt.Println(mi.Get())
}

Set method does not work, because in func (this MyStruct) Set(i int), this MyStruct is not a pointer, and the changes are lost as soon at the function exits. But making it this *MyStruct would not compile. Is there any workaround?

Answer 1

To answer the question the in the title to post:

Go does not use classes, but provides many of the same features:

* message passing with methods
* automatic message delegation via embedding
* polymorphism via interfaces
* namespacing via exports

From: http://nathany.com/good/

Solving the code you supplied, I will leave to some more learned Gopher