The example at 
https://github.com/grpc/grpc/blob/v1.33.1/examples/cpp/helloworld/greeter_async_server.cc

has blatantly obvious memory leaks.  If CallData allocates itself when 
proceed is called, there is no way for it to clean up the new instance when 
the server is shutting down. Also, the CallData that is allocated before 
the loop even begins can't be cleaned up, since no pointer to it is stored. 
I guess the example just doesn't care, as it assumes the process is just 
going to abort. However, trying to make sense of CallData, its states, and 
how we would do it in the real world isn't obvious with the example in this 
state.

Is there one that doesn't blatantly leak?

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