On Tue, Apr 01, 2014 at 06:35:59PM +0800, Nala Ginrut wrote: > On Thu, 2014-03-27 at 21:03 -0700, Eduardo Acuña wrote:
Slightly reordered .... > > Sorry I can't help you on this. IMO, you don't understand why you can't > cast it as a function pointer. Maybe it's different from C? Yes, somehow C++ happens to be different from C ;-) > > My program calls scm_boot_guile from the member function init() of the > > GuileApplication class. There is no problem passing the argc and argv > > to scm_boot_guile, however i want to pass the member function > > guileMain as the third argument of scm_boot_guile like a void function > > pointer (i can't cast the member function as a function pointer). The > > current way i'm avoiding this problem is passing as the third argument > > a function outside of the GuileApplication class, and passing the > > address of the instance of the GuileApplication as the fourth argument > > for dereferencing the object and calling the guileMain member function > > from there, so i had to make this non-member function a friend of > > GuileApplication. This method works but it doesn't seem to be a clean > > way of doing things. I'd do this slightly different: instead of using a non-member function (which needs to be declared a friend) I'd rather give my object a static function - static functions _can_ be used as C callbacks (since they don't expect a hidden instance as the first parameter). You'd still need to pass down an instance of your GuileApplication class so it can be handed to scm_boot_guile as the data parameter. This is asdmittedly only slightly better than your solution. HTH Ralf Mattes
