sc_port get_interface() method

Hello

1. In IEEE doc @112, I see the following

Because the time at which deferred port binding is completed is implementation defined, it is implementation defined whether get_interface returns a pointer to a channel or a null pointer.

So where I shoudl check whether the port is bounded or not and accordingly take action so that my code works fine with all implementations.

2. For a multiport how to get all interfaces connected to that port. The get_interface returns only the pointer to first channel instance

Thanks

RJ