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C++ Queue Equal To Operator

The C++ std::queue::operator==() function is used to check if both the queues are equal by comparing their elements and order. It returns true if both queues contain same elements otherwise it returns false. It is useful for comparing queues efficiently, providing a convenient way to check for equality without iterating through each element. 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 identical otherwise false.

Let's look at the following example, where we are going to initialize the both queue with same elements and applying the operator==() function.

#include <iostream>
#include <queue>
int main()
{
    std::queue<int> a, b;
    a.push(11);
    a.push(222);
    b.push(11);
    b.push(222);
    if (a == b)
        std::cout << "Queues are equal." << std::endl;
    else
        std::cout << "Queues are not 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 initialize the queues of different size and applying the operator==() function.

#include <iostream>
#include <queue>
int main()
{
    std::queue<int> a, b;
    a.push(11);
    a.push(222);
    b.push(1);
    if (a == b) {
        std::cout << "Queues are equal.";
    } else {
        std::cout << "Queues are not equal.";
    }
    return 0;
}

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

Queues are not equal.

In the following example, we are going to apply the operator==() function on the empty queue and observing the output.

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

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

Queues are equal.

Following is the example, where we are going to initialize the queue with same number of elements with different values and applying operator==() function.

#include <iostream>
#include <queue>
int main()
{
    std::queue<int> x, b;
    x.push(11);
    x.push(2);
    b.push(222);
    b.push(33);
    if (x == b) {
        std::cout << "Queues are equal.";
    } else {
        std::cout << "Queues are not equal.";
    }
    return 0;
}

Following is the output of the above code −

Queues are not equal.

queue.htm

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