You can still use all of your functionality, but how you access is , in my opinion, a little contrived. What I did to use my C++ code was to instantiate the C++ objects in the dllmain. From there I built C wrappers which called my functions. When I had to pass in data structures I had to build C wrappers to handle bundling and unbundling the primitive data types. For me, I was using the functions in the standard template library for sorting that I wanted to continue to use. After i made the committment to use the wrapper functions things went very easy.
One thing I did do was to build vi's that would wrap one or two of the C++ methods. This way I only replicated what looked like standard vi's through my application and I did not have the "Call Library Function Node" directly visible on my 'high level' vi's.
Rob Steele
