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### SSL handshake handler requirements

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`.

##### Examples

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));