The C++ Compiler currelty emits most functions in the *Client class as non-virtual.
This makes it difficult to subclass the generated *Client class and override its functions.
In particular, if a subclass overrides the *_send and *_recv functions, it must also override the function itself.
Otherwise, the *Client version of the function calls the *Client versions of *_send and *_recv.
A workaround is to inherit from the interface class *If, which has virtual functions,
and use them to call *Client class member functions.
But this can be cumbersome in some situations, and still requires additional functions to be overridden.
I propose to add a virtual option to the C++ compiler that emits function declarations as virtual.
I have attached a patched version of t_cpp_generator.cc from Thrift 0.2.0 - I can work out how to turn it into a patch file if needed.
Is this worth merging into the trunk?