[lwip-devel] Proposing change to netif state member

[Bill Auerbach]

It would be nice to override the void type in void *state in struct netif.h.  This is the pointer to be used by the Ethernet hardware port or other user-code and it would be nice to use it with the correct type instead of casting whenever it’s used.  Even currently where an assignment is made to a variable of the correct type, a cast isn’t required in C but it is in C++.  I would like to use for example netif->state->somethingInMyPort;

I’m proposing something like this:

  /** This field can be set by the device driver and could point

   *  to state information for the device. */

#ifdef NETIF_STATE_TYPE

  NETIF_STATE_TYPE state;

#else

  void *state;

#endif

And in cc.h I can use:

#define NETIF_STATE_TYPE struct myPortDescriptor *

Then all my uses of netif->state are of the correct type and I don’t need to cast it.

Bill