Golang不能将类型用作参数中的类型

Question

I am new to Go language and I am trying to get familiar with interfaces and their assignability.

I am trying to pass an argument from a struct into a function which is imported from another package.

main.go package:

package main  

import {
  anotherPackage
}

type I1 interface {
  anotherPackage.I2
}

type T1 struct {
  *anotherPackage.S1
}

type T2 struct {
  variable1 T1
}

type T3 struct {
  variable2 T2
}

func handler() {
  var fromI I
  var input = T3{}

  template := fromI.ExportedFunction(input.T3.variable1)
}

func main() {
  handler()
}

anotherPackage.go package

package anotherPackage

type I2 interface {
  ExportedFunction(S1)
}

type S1 struct {
  Path string
  File string
}

type S2 struct {}

func (s2 *S2) ExportedFunction(s1 S1) {}

I keep getting an error:

cannot use input.T3.variable1 (type T1) as type anotherPackage.S1 in argument to fromI.ExportedFunction

Answer 1

You cannot do that in Go like other Object-oriented language because Go does not support polymorphism. How about using T1 interface as the parameter to ExportedFunction instead of S1. example https://play.golang.org/p/72hgbSwNkaS