struct task 
{
	task(void (*f)(void)) 
  {
		f_ = f;
	}
	void operator()() 
  {
		(f_)();
	}

protected:
	void (*f_)(void);
};

void setup() 
{
	Serial.begin(115200);

  auto hw = []() -> void 
  {
    Serial.println("Hello world!");
  };
  
	task t(hw);
	t();
}

void loop()
{
}