I'm looking for an example of using umfpackControl because I want to pass some control parameters. How should I use it? Currently, I'm using it as follows

        auto &umfc = solver.umfpackControl();
        umfc[UMFPACK_IRSTEP] = 0;

If I call auto params = solver.umfpackControl(); again and print the array, I can see that my change has been made. Is this the right way to use it?