-#define structeq(a, b) \
- (memcmp((a), (b), sizeof(*(a)) + 0 * sizeof((a) == (b))) == 0)
+#define STRUCTEQ_DEF(sname, padbytes, ...) \
+static inline bool CPPMAGIC_GLUE2(sname, _eq)(const struct sname *_a, \
+ const struct sname *_b) \
+{ \
+ BUILD_ASSERT(((padbytes) < 0 && \
+ CPPMAGIC_JOIN(+, CPPMAGIC_MAP(STRUCTEQ_MEMBER_SIZE_, \
+ __VA_ARGS__)) \
+ - (padbytes) >= sizeof(*_a)) \
+ || CPPMAGIC_JOIN(+, CPPMAGIC_MAP(STRUCTEQ_MEMBER_SIZE_, \
+ __VA_ARGS__)) \
+ + (padbytes) == sizeof(*_a)); \
+ if (CPPMAGIC_JOIN(+, CPPMAGIC_MAP(STRUCTEQ_MEMBER_SIZE_, __VA_ARGS__)) \
+ == sizeof(*_a)) \
+ return memcmp(_a, _b, sizeof(*_a)) == 0; \
+ else \
+ return CPPMAGIC_JOIN(&&, \
+ CPPMAGIC_MAP(STRUCTEQ_MEMBER_CMP_, \
+ __VA_ARGS__)); \
+}
+
+/* Helpers */
+#define STRUCTEQ_MEMBER_SIZE_(m) sizeof((_a)->m)
+#define STRUCTEQ_MEMBER_CMP_(m) memcmp(&_a->m, &_b->m, sizeof(_a->m)) == 0
+