Working with unknown types in go

types.go

package main

import "fmt"

// Void - a generic type
type Void struct {
  value interface{}
}

func work(universe map[int]interface{}, v Void) {
  value := v.value
  switch t := value.(type) {
  default:
    fmt.Println("Unknow", t)
  case int:
    universe[1] = v
  }
}

func main() {
  myInt := 100
  data := Void{}
  data.value = myInt
  universe := make(map[int]interface{})

  work(universe, data)
  fmt.Println(universe)
}