Hi all!
I would like to use some objects from a C++ library in my PD object. The point is as far as i know, the PD object must be writen in C and have to have some specific functions. So the point is, if Im implementing my PD object I cannot use the C++ objects I wanted. Another possibility would be to write something in C++ and declare the PD object as extern "C"{} but then I really dont know what would happen, because I never used a PD implementation as a linked object. Would I loose the graphical interface? Should I compile the whole PD in C++?
Any sugestions?

Thank you very much.

Sincerely,
Sergio.

The Pd external object file (as in "object code") needs to have one symbol exported. In C++, if your external is called "foodiddly", you need to have:

extern "C" {
void foodiddly_setup(void);
}

Then you can load your external by creating an object in Pd as usual: [foodiddly]. The rest of the code can be called whatever you like, but must be callable from C (for C++ I think this means it must be a normal function, and not a method).

You might want to look at flext, which is supposed to make writing C++ externals for Pd easier. And of course, read the Pd external howto: http://iem.at/pd/externals-HOWTO/

It's no problem to use C++ libraries, your external just needs to call the right functions in the library, and translate between Pd values and what the library needs.