Method head

be/src/util/internal-queue.h:82–86

Returns the element at the head of the list without dequeuing or nullptr if the queue is empty. This is O(1).

  /// Returns the element at the head of the list without dequeuing or nullptr
  /// if the queue is empty. This is O(1).
  T* head() const {
    std::lock_guard<LockType> lock(lock_);
    if (IsEmptyLocked()) return nullptr;
    return reinterpret_cast<T*>(head_);
  }

  /// Returns the element at the end of the list without dequeuing or nullptr
  /// if the queue is empty. This is O(1).