C++ Queue Library - operator!= Function



Description

The C++ function std::queue::operator!= tests whether two queues are equal or not. Comparison is done by applying corresponding operator to the underlying container.

Declaration

Following is the declaration for std::queue::operator!= function form std::queue header.

C++98

template <class T, class Container>
bool operator!= (const queue<T,Container>& q1, const queue<T,Container>& q2);

Parameters

  • q1 − First queue object.

  • q2 − Second queue object.

Return value

Returns true if both queues are not identical otherwise false.

Exceptions

This member function never throws exception.

Time complexity

Linear i.e. O(n)

Example

The following example shows the usage of std::queue::operator!= 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);
      q2.push(i + 1);
   }

   q1.pop();

   if (q1 != q2)
      cout << "q1 and q2 are not identical." << endl;

   q2.pop();

   if (!(q1 != q2))
      cout << "q1 and q2 are identical." << endl;

   return 0;
}

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

q1 and q2 are not identical.
q1 and q2 are identical.
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