Returns true if the priority queue is empty
| 339 | |
| 340 | /// Returns true if the priority queue is empty |
| 341 | bool empty() const { return m_container.empty(); } |
| 342 | |
| 343 | /// Returns a const reference to the i-th element in the underlying container. |
| 344 | value_type const &operator[](size_type i) const { |