Helper class to initialize a TAO_ECG_Mcast_Gateway. More...

#include <ECG_Mcast_Gateway.h>

Collaboration diagram for TAO_ECG_Mcast_Gateway::Attributes:

Public Member Functions
	Attributes (void)
Public Attributes
Address_Server_Type	address_server_type
Handler_Type	handler_type
Service_Type	service_type
u_char	ttl_value
ACE_CString	nic
int	ip_multicast_loop
int	non_blocking

Detailed Description

Helper class to initialize a TAO_ECG_Mcast_Gateway.

The TAO_ECG_Mcast_Gateway class has several properties that can be configured at initialization time, with default values. The canonical trick of using a constructor or init() method with multiple arguments does not work because to change the last argument the application developer needs to know all the other defaults.

Instead we define a helper class that initializes all the fields to reasonable defaults. The application only sets the fields that it is interested into, if new fields are added applications do not need to change.

With a little trickery we can even eliminate named temporaries:

TAO_ECG_Mcast_Gateway gw;
gw.init(TAO_ECG_Mcast_Gateway::Attributes().set_foo(x).set_bar(y));

but we are not implementing that one (detecting errors is too hard without exceptions and ACE+TAO are somewhat shy of exceptions at this point.)