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

C++ Deque::clear() Function

The C++ std::deque::clear() function is used to remove all elements from the deque, making its size zero. When this function is invoked, it destroys the objects contained in the deque and deallocates their memory, but the capacity of the deque remains unchanged.

Following is the syntax for std::deque::clear() function.

void clear() noexcept;

It does not accepts any parameter.

This function does not return any thing.

This function never throws excpetion.

The time complexity of this function is Linear i.e. O(n)

Let's look at the following example, where we are going to apply the clear() function on the integers deque.

#include <iostream>
#include <deque>
int main()
{
    std::deque<int> a {1,22,333,4444};
    std::cout << "Size before clear: " << a.size() << std::endl;
    a.clear();
    std::cout << "Size after clear: " << a.size() << std::endl;
    return 0;
}

Output of the above code is as follows −

Size before clear: 4
Size after clear: 0

Consider the another scenario, where we are going to use the clear() function on the string deque.

#include <iostream>
#include <deque>
#include <string>
int main()
{
    std::deque<std::string> a {"TP", "TutorialsPoint", "Tutorix"};
    std::cout << "Size before clear: " << a.size() << std::endl;
    a.clear();
    std::cout << "Size after clear: " << a.size() << std::endl;
    return 0;
}

Following is the output of the above code −

Size before clear: 3
Size after clear: 0

Following is the example, where we are going to apply the clear() function on the empty deque.

#include <iostream>
#include <deque>
int main()
{
    std::deque<int> a;
    a.clear();
    std::cout << "Size of the deque : " << a.size() << std::endl;
    return 0;
}

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

Size of the deque : 0

deque.htm

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