golang接口转换为实现类 (cannot have dynamic type misshing method has pointer receiver)

举例如下：

type TestInterface interface{

    Test()

}

 

type MyTest struct{

   a int

}

func (test *MyTest) Test(){

 fmt.Printf("a is:%d",test.a)

}

func (test *MyTest) AfterTest(){

 fmt.Printf("MyTest is finished.")

}

 

func runATest(ti TestInterface){

  ti.Test()

  mytest,ok:=ti.(MyTest)

   if ok {

      mytest.AfterTest()

   }

}

如上的接口类型转换会报错：cannot have dynamic type  MyTest,misshing method has pointer receiver。

这个原因是因为实现了TestInterface接口的类是*MyTest,而不是MyTest，下面修改一个正确的版本

func runATest(ti TestInterface){

  ti.Test()

  pMyTest,ok:=ti.(*MyTest)

   if ok {

      pMyTest.AfterTest()

   }

}

这样就能顺利通过编译了