C++ several ways to clear the queue (queue)

C++ Several methods of clearing the queue (queue) The queue in
C++ does not support the clear operation, but the deque of the deque does support the clear operation.

Method 1
Assign directly with an empty queue object

queue<int> q1;
// process
// ...
q1 = queue<int>();

Method 2:
Traverse out of the queue

while (!Q.empty()) Q.pop();

Method 3
Use swap, which is the most efficient, defines clear and maintains the standard of STL container.

void clear(queue<int>& q) {
    queue<int> empty;
    swap(empty, q);
}

 

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