Official way to compare two IPv6 addresses in C?

In some C code, I have a pair of IPv6 addresses,

struct in6_addr value1;
struct in6_addr value2;

I want to know if they both refer to the same address. I can't simply use the '==' operator on these structures; nor is there a single value within a structure that I can compare with '==' (unlike with IPv4).

For now I've settled on using memcmp. First like so,

#include <string.h>
memcmp(&in6_addr_a, &in6_addr_b, sizeof(struct in6_addr)) == 0

And then later I created a macro, in6_equal, to make code calling this easier to read,

#include <string.h>
#define in6_equal(in6_addr_a, in6_addr_b) (memcmp(&in6_addr_a, &in6_addr_b, sizeof(struct in6_addr)) == 0)
fail_unless(in6_equal(value1, value2), "IPv6 values not successfully matched");

Is there an official API call that I should be using to do these comparisons, or does everyone roll their own; along the above lines?