1 files changed, 3 insertions, 0 deletions
diff --git a/src/core/defs.h b/src/core/defs.h
index 5a9ded92..3a714f85 100644
--- a/src/core/defs.h
+++ b/src/core/defs.h
@@ -25,6 +25,9 @@
 #define NNI_ASSERT(x)
 #endif
 
+// Returns the size of an array in elements. (Convenience.)
+#define NNI_NUM_ELEMENTS(x) (sizeof(x) / sizeof((x)[0]))
+
 // These types are common but have names shared with user space.
 typedef struct nng_msg      nni_msg;
 typedef struct nng_sockaddr nni_sockaddr;