返回返回类型匹配接口的回调时出错

Question

错误示例@play.golang.org：http ://play.golang.org/p/GRoqRHnTj6

即使接口完全为空，以下代码也会返回“prog.go:16: cannot use NewMyGame (type func() MyGame) as type func() Playable in return argument”。也请找到下面附带的代码，不幸的是我完全被难住了，任何帮助将不胜感激。

package main

// Define an arbitrary game type

type MyGame struct{}

// Create a constructor function for arbitrary game type

func NewMyGame() MyGame {

    return MyGame{}

}

// Define an interface defining game types

type Playable interface{}

// In my app it will return a list of constructors matching interface

func Playables() func() Playable {

    return NewMyGame

}

func main() {}

Answer 1

就像错误所说的那样，cannot use NewMyGame (type func() MyGame) as type func() Playable一个简单的解决方法是func Playables() func() Playable {    return func() (Playable) {        return NewMyGame()    }}