C++ Queue Library - queue() Function

Description

The C++ initialize constructor std::queue::queue() constructs a queue object and assigns internal container by a copy of ctnr.

Declaration

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

C++11

explicit queue (const container_type& ctnr);

Parameters

ctnr − Container type which is second parameter of class template.

Return value

Constructor never returns value.

Time complexity

Linear i.e. O(n)

Example

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

#include <iostream>
#include <queue>

using namespace std;

int main(void) {   
   auto it = {1, 2, 3, 4, 5};
   queue<int> q(it);

   cout << "Queue contents are" << 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 −

Queue contents are
1
2
3
4
5