Question

(defun (setf xwin-border-width) (width win)
    (setf (xlib:drawable-border-width win) width))

then how to call the above function ? In fact i donot really understand what “(setf xwin-border-width)” means in place of function time ?

Sincerely !

Answer 1

This defines a setf function. You can call it using (setf (xwin-border-width *some-window*) width).

You might find the documentation for setf useful: http://www.lispworks.com/documentation/lw50/CLHS/Body/m_setf_.htm

The Hyperspec also has a section on generalised references: http://www.lispworks.com/documentation/lw50/CLHS/Body/05_a.htm