public function getDeclaringFunction()
    {
        if (null === $this->refRoutine) {
            if (is_array($this->routineName) === true) {
                $this->refRoutine = new MoufReflectionMethod($this->routineName[0], $this->routineName[1]);
            }
        }
        
        return $this->refRoutine;
    }