Just a note in case it's not obvious.  Modern C++14, using std::make_shared<T>, 
can be used with Racket.  Mainly due to the make-phantom-bytes call,  Racket's 
GC collects memory at appropriate intervals for my work.  

If anyone needs to access std::shared_ptr<X> stuff in Racket, I find that 
wrapping the shared_ptr in a (return new boost::any(the-thing)) and having a 
general-purpose (register-finalizer) call handles the C++ destruction and 
typing of the boost::any content just fine.

Thanks for a fast and well-thought FFI.




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