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