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        A range connect handler must meet the requirements for a handler.
        A value h of a range connect handler class should work correctly
        in the expression h(ec, ep), where ec is an lvalue
        of type const error_code and ep is an lvalue of
        the type Protocol::endpoint for the Protocol type
        in the corresponding connect() or async_connect()` function.
      
A free function as a range connect handler:
void connect_handler(
    const boost::system::error_code& ec,
    const boost::asio::ip::tcp::endpoint& endpoint)
{
  ...
}
A range connect handler function object:
struct connect_handler
{
  ...
  template <typename Range>
  void operator()(
      const boost::system::error_code& ec,
      const boost::asio::ip::tcp::endpoint& endpoint)
  {
    ...
  }
  ...
};
A lambda as a range connect handler:
boost::asio::async_connect(...,
    [](const boost::system::error_code& ec,
      const boost::asio::ip::tcp::endpoint& endpoint)
    {
      ...
    });
        A non-static class member function adapted to a range connect handler using
        std::bind():
      
void my_class::connect_handler(
    const boost::system::error_code& ec,
    const boost::asio::ip::tcp::endpoint& endpoint)
{
  ...
}
...
boost::asio::async_connect(...,
    std::bind(&my_class::connect_handler,
      this, std::placeholders::_1,
      std::placeholders::_2));
        A non-static class member function adapted to a range connect handler using
        boost::bind():
      
void my_class::connect_handler(
    const boost::system::error_code& ec,
    const boost::asio::ip::tcp::endpoint& endpoint)
{
  ...
}
...
boost::asio::async_connect(...,
    boost::bind(&my_class::connect_handler,
      this, boost::asio::placeholders::error,
      boost::asio::placeholders::endpoint));