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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_queue_operator_assignment_function.htm below:

C++ Queue::operator=() Function

The C++ std::queue::operator=() function is used to copy elements from one queue to another queue maintaining the proper order. when this function is invoked, it deallocates memory associated with the target queue and then copies the elements from the source queue. This function ensures that both queue are independent after assignment, preventing the modification of one queue affecting the other. The time complexity of this function is linear O(n).

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

operator=( const queue<T,Container>& other )
or
operator=( queue<T,Container>&& other );

• other − It indicates the another queue object of same type.

This function returns this pointer.

Let's look at the following example, where we are going to assign one queue to another queue.

#include <iostream>
#include <queue>
int main()
{
    std::queue<int> x, y;
    x.push(1);
    x.push(22);
    y = x;
    while (!y.empty()) {
        std::cout << y.front() << " ";
        y.pop();
    }
    return 0;
}

Output of the above code is as follows −

1 22

Consider the another scenario, where we are going to assign the empty queue to another queue.

#include <iostream>
#include <queue>
int main()
{
    std::queue<int> queue1, queue2;
    queue2 = queue1;
    std::cout << " Size after assigning:" << queue2.size() << std::endl;
    return 0;
}

Following is the output of the above code −

Size after assigning:0

In the following example, we are going to assign the queue to itself and observing the output.

#include <iostream>
#include <queue>
int main()
{
    std::queue<int> x;
    x.push(1);
    x.push(2);
    x = x;
    std::cout << "Size after assigning: " << x.size() << std::endl;
    return 0;
}

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

Size after assigning: 2

queue.htm

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