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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 lambda as a handshake handler:
ssl_stream.async_handshake(...,
    [](const boost::system::error_code& ec)
    {
      ...
    });
        A non-static class member function adapted to a handshake handler using
        std::bind():
      
void my_class::handshake_handler(
    const boost::system::error_code& ec)
{
  ...
}
...
ssl_stream.async_handshake(...,
    std::bind(&my_class::handshake_handler,
      this, std::placeholders::_1));
        A non-static class member function adapted to a handshake handler using
        boost::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));