[/
 / Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 /
 / Distributed under the Boost Software License, Version 1.0. (See accompanying
 / file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 /]

[section:BufferedHandshakeHandler Buffered handshake handler requirements]

A buffered handshake handler must meet the requirements for a [link
boost_asio.reference.Handler 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`.

[heading Examples]

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));

[endsect]