Pd++ is a C++ audio synthesis library. It is based on the C code of Pure Data. Pd++ implements Pd objects as C++ classes. It is an open source library with a simplified BSD license. For more information, documentation or download go to:
https://bitbucket.org/resler/pd/wiki/Home
UPDATE: There is now a project that shows how to use Pd++ to create Audio Unit Plug-ins. I created a Single Side-Band Modulation 64-bit AU plug-in. For the project and code go to: