Assume the existence of a window class with integer data members width and height. overload the < < operator for the window class-- i. e., write a nonmember ostream-returning function that accepts a reference to an ostream object and a constant reference to a window object and sends the following to the ostream: 'a (width x height) window' (without the quotes and with width and height replaced by the actual width and height of the window. thus for example, if the window had width=80 and height=20, < < would send 'a (80 x 20) window' to the ostream object.) don't forget to have the function return the proper value as well. assume the operator has been declared a friend in the window class.