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        A buffered handshake handler must meet the requirements for a handler.
        A value h of a buffered handshake handler class should work
        correctly in the expression h(ec, s), where ec
        is an lvalue of type const error_code and s is
        an lvalue of type const size_t.
      
A free function as a buffered handshake handler:
void handshake_handler(
    const boost::system::error_code& ec,
    std::size_t bytes_transferred)
{
  ...
}
A buffered handshake handler function object:
struct handshake_handler
{
  ...
  void operator()(
      const boost::system::error_code& ec,
      std::size_t bytes_transferred)
  {
    ...
  }
  ...
};
        A non-static class member function adapted to a buffered handshake handler
        using boost::bind():
      
void my_class::handshake_handler(
    const boost::system::error_code& ec,
    std::size_t bytes_transferred)
{
  ...
}
...
socket.async_handshake(...,
    boost::bind(&my_class::handshake_handler,
      this, boost::asio::placeholders::error,
      boost::asio::placeholders::bytes_transferred));