在go中使用函数作为if语句的参数

I'm trying to get the following to work:

func ArticlesHandler(w http.ResponseWriter, r *http.Request) {
  ...
  if(ValidTokenProvided(w,r)){
    ...
  }
  ...
}
func ValidTokenProvided(w http.ResponseWriter, r *http.Request) {
  ...
  return false
}

How can I pass a function as a parameter? or if I can't, what is the best way to achieve this.

ValidTokenProvided was a void method.. Made it bool:

func ValidTokenProvided(w http.ResponseWriter, r *http.Request) bool {
...