+#ifndef alignof
+ /**
+ * Return the alignment in memory of a generic data type.
+ *
+ * \note We need to worry about alignment when allocating memory that
+ * will be used later by unknown objects (e.g., malloc()) or, more
+ * generally, whenever creating generic container types.
+ */
+ #define alignof(type) offsetof(struct { char c; type member; }, member)
+#endif