title: Examples of C interfaces to C++ libraries?
body: <p>I'm in the process of writing a C interface to a C++ library, and I'm looking for some high-quality examples (or best practices).</p>
  
  <p>So far this one seems pretty promising: <a href="http://czmq.zeromq.org/manual:czmq">http://czmq.zeromq.org/manual:czmq</a></p>
  
  <p>Any other suggestions?</p>