#includeIn this example, the `std::set` container is created with four elements using uniform initialization. The `mySet.clear()` function is called to remove all of the elements of the set. The size of the set is then outputted using `std::cout`, which will result in `0` since all the elements were removed. This function is a member of the Standard Template Library in C++.#include int main() { std::set mySet{1,2,3,4}; mySet.clear(); std::cout << "Size of mySet after clear() operation: " << mySet.size() << std::endl; return 0; } // Output: // Size of mySet after clear() operation: 0