rb_define_method (cWindow, "size", c_size_get, 0);
rb_define_method (cWindow, "geometry", c_geometry_get, 0);
rb_define_method (cWindow, "border_width", c_border_width_get, 0);
rb_define_method (cWindow, "size", c_size_get, 0);
rb_define_method (cWindow, "geometry", c_geometry_get, 0);
rb_define_method (cWindow, "border_width", c_border_width_get, 0);