Method pop_back

sql/mem_root_array.h:196–202

Removes the last element in the array, effectively reducing the container size by one. This destroys the removed element. */

    container size by one. This destroys the removed element.
   */
  void pop_back()
  {
    DBUG_ASSERT(!empty());
    if (!has_trivial_destructor)
      back().~Element_type();
    m_size-= 1;
  }

  /**
    Resizes the container so that it contains n elements.