Re: Guile initialization and string evaluation with C++

[Eduardo Acuña]

Thank you very much for your feedback! :D I updated the code ( https://github.com/eduardoacye/GuileCppApplication ).

If you have any other suggestions for making a better C++ interface with GNU Guile, i can do my best to put them in the code.

Eduardo.

On Tue, Apr 1, 2014 at 6:34 AM, Ralf Mattes <address@hidden> wrote:

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