Thread: Structs, members, and casting

You can get away with casting, something like:

Code:

u32_t ipAddr = 0xC0a80001;

a_func((struct ip_addr *)&ipAddr);

--
Mats

Of course, that's relying on what the structure contains. If that ever changes in the future, you could end up in trouble.

Some alternatives: in C99 and with GNU C, you can use anonymous, named member (for lack of a better name) initialized structures.

Code:

a_func(&(struct ip_addr){.addr = ipAddr});

That's not standard C89, however.

You could always use a function if you do this in several places -- if you don't care about thread-safeness:

Code:

struct ip_addr *u32_to_ip_addr(u32_t num) {
    static struct ip_addr ip;
    ip.addr = num;
    return &ip;
}

That's what I'd probably do.