C++ Queue Library - push() Function

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Description

The C++ function std::queue::push() inserts new element at the end of queue by performing move operation. This member function increases size of queue by one.

Declaration

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

C++11

void push (value_type&& val);

Parameters

val − Value to be assigned to newly inserted element.

Return value

None

Time complexity

Constant i.e. O(1)

Example

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

#include <iostream>
#include <queue>

using namespace std;

int main(void) {
   queue<int> q1, q2;

   for (int i = 0; i < 5; ++i)
      q1.push(i + 1);

   while (!q1.empty()) {
      /* push element by performing move operation */
      q2.push(move(q1.front()));
      q1.pop();
   }

   cout << "Contents of queue" << endl;
   while (!q2.empty()) {
      cout << q2.front() << endl;
      q2.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