C++11 Functional parameter vs Haxe

main.cpp

#include <iostream>
#include <string>
#include <functional>

class Sayer {
  public:
    void say(std::function<void(std::string)> func, std::string data) {
      func(data);
    }
};

int main() {
  Sayer s;
  s.say( [](std::string text) { std::cout << text << std::endl; }, 
         "Hallo Welt");
}

Main.hx

package app;

class Sayer {
  public function new() {}
  public function say(func: String->Void, text:String) {
    func(text);
  }
}

class Main {
  static function main() {
    var s = new Sayer();
    s.say(function(a:String) { return Sys.println(a); }, "Hallo Welt");
  }
}