On Mar 2, 2012, at 4:32 AM, katja wrote: > On Wed, Feb 29, 2012 at 9:17 PM, Thomas Grill <g...@grrrr.org> wrote: >> >> Hi Katja, >> maybe i'm chiming in too late, but i would definitely use C++ programming for >> whatever i do in the C-world. >> It's no problem to make the public API (exported functions) C-style then to >> avoid >> various hassles. >> If your library is just a wrapper it might not be worth to live in both >> worlds, but if it's >> a substantial amount of code, i would go for C++ with a C interface. >> gr~~~ >> > > > Thanks for your recommendation, Thomas. Mathieu and IOhannes did > similar suggestions. > > Can anyone point me to an example of a C++ lib with C API, in the > field of dsp? Not sure if I can think of the best way how to do it. > > As I see it now, a C++ class could be instantiated and accessed from C like > so: > > - define an extern "C" wrapper which calls a class constructor and > returns the pointer to the instantiated object. > > - define extern "C" accessor wrappers which take the object pointer as > their first argument, like how you would access data in C structs. > > - via the object pointer, the extern "C" accessor wrappers can call > class member functions to access the class private data in C++ style. > > > How about function call overhead? For constructor and destructor no > problem of course, but accessor wrappers will be called often, in fact > it doubles the number of function calls for external access. >
The C++ ABI compatibility problems are not the only thing that make C++ hard to deploy. On limited platforms like Android, they include limited C++ support, like no exceptions and other stuff. Its still possible to write portable C++, if you track all of these various issues across the platforms you want to support. .hc ---------------------------------------------------------------------------- Terrorism is not an enemy. It cannot be defeated. It's a tactic. It's about as sensible to say we declare war on night attacks and expect we're going to win that war. We're not going to win the war on terrorism. - retired U.S. Army general, William Odom _______________________________________________ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
