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C++ Queue Operator Not Equal To

The C++std::queue::operator!=() function for a queue is used to compare two queue objects for inequality. It checks if the queue differ in size or in their respective elements. If any element or the size of the queues are not same, it return true otherwise it return false. The time complexity of this function is linear i.e.O(n).

Following is the syntax for std::queue::operator!=() function.

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

• q1 − It indicates the first queue object.
• q2 − It indicates the second queue object.

This function returns true if both queues are not identical otherwise false.

Let's look at the following example, where we are going to initialize the queues of same elements in the same order and observing the output.

#include <iostream>
#include <queue>
int main()
{
    std::queue<int> x;
    std::queue<int> y;
    x.push(11);
    x.push(2);
    y.push(11);
    y.push(2);
    if (x != y) {
        std::cout << "Queues are not equal." << std::endl;
    } else {
        std::cout << "Queues are equal." << std::endl;
    }
    return 0;
}

Output of the above code is as follows −

Queues are equal.

Consider the another scenario, where we are going to use the operator!=() function on the different sized queue.

#include <iostream>
#include <queue>
int main()
{
    std::queue<int> a;
    std::queue<int> b;
    a.push(11);
    b.push(11);
    b.push(2);
    if (a != b) {
        std::cout << "Queues are not equal." << std::endl;
    } else {
        std::cout << "Queues are equal." << std::endl;
    }
    return 0;
}

Following is the output of the above code −

Queues are not equal.

In the following example, we are going to perform the comparison on the empty queue and observing the output.

#include <iostream>
#include <queue>
int main()
{
    std::queue<int> a;
    std::queue<int> b;
    if (a != b) {
        std::cout << "Queues are not equal." << std::endl;
    } else {
        std::cout << "Queues are equal." << std::endl;
    }
    return 0;
}

If we run the above code it will generate the following output −

Queues are equal.

queue.htm

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