Return a reference providing non‐modifiable access to the element at the specified position in the bsl::deque held by this proctor. The behavior is undefined unless position < size where size is the number of elements in that deque.
Return a reference providing non‐modifiable access to the element at the specified position in the bsl::deque held by this proctor. The behavior is undefined unless position < size where size is the number of elements in that deque.