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Move accept handler requirements

A move accept handler must meet the requirements for a handler. A value h of a move accept 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 the nested type Protocol::socket for the type Protocol of the socket class template.

Examples

A free function as a move accept handler:

void accept_handler(
    const boost::system::error_code& ec, boost::asio::ip::tcp::socket s)
{
  ...
}

A move accept handler function object:

struct accept_handler
{
  ...
  void operator()(
      const boost::system::error_code& ec, boost::asio::ip::tcp::socket s)
  {
    ...
  }
  ...
};

A lambda as a move accept handler:

acceptor.async_accept(...,
    [](const boost::system::error_code& ec, boost::asio::ip::tcp::socket s)
    {
      ...
    });

A non-static class member function adapted to a move accept handler using std::bind():

void my_class::accept_handler(
    const boost::system::error_code& ec, boost::asio::ip::tcp::socket socket)
{
  ...
}
...
boost::asio::async_accept(...,
    std::bind(&my_class::accept_handler,
      this, std::placeholders::_1,
      std::placeholders::_2));

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