C++ Queue Library - pop() Function

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Description

The C++ function std::queue::pop() removes front element of the queue and reduces size of the queue by one.

This member function effectively calls the pop_front member function of the underlying container.

Declaration

Following is the declaration for std::queue::pop() function form std::queue header.

C++98

void pop();

Parameters

None

Return value

None

Time complexity

Constant i.e. O(1)

Example

The following example shows the usage of std::queue::pop() function.

#include <iostream>
#include <queue>

using namespace std;

int main(void) {
   queue<int> q;

   for (int i = 0; i < 5; ++i)
      q.emplace(i + 1);

   cout << "Contents of queue" << endl;
   while (!q.empty()) {
      cout << q.front() << endl;
      q.pop();
   }

   return 0;
}

Let us compile and run the above program, this will produce the following result −

Contents of queue
1
2
3
4
5