RE: [lwip-devel] IPv6 design considerations

[Bill Auerbach]

Ivan,

>This requires some refactoring, as all code must be changed as follows:
>  pcb->local_ip   to:    pcb->local_ip.ip4
>
>I hope it is acceptable to make this change throughout?

You can probably use a conditional macro:

#if IPV4
#define local_ip local_ip.ip4
#else // both IPv4 and IPv6
#define local_ip local_ip
#endif

Of course, this must be included *after* the local_ip union declaration.

So for IPV4 the source looks the same and for IPv4/IPv6 the union is used.
In any case, I'm trying to help find a way to not edit all of the references
- it should be possible.  The preprocessor is quite powerful.

Bill