/**
  * @see Collection::containsCollection() Collection::containsCollection()
  */
 public function containsCollection(Collection $elements_)
 {
     // TODO Implement Arrays::containsValues(..)
     return Arrays::containsValues($this->m_elements, $elements_->arrayValue(), Arrays::UNSORTED);
 }
 /**
  * @see Collection_Mutable::addAll() Collection_Mutable::addAll()
  */
 public function addAll(Collection $elements_)
 {
     foreach ($elements_->arrayValue() as $element) {
         $this->add($element);
     }
 }