Changeset 5104

Timestamp:

09/28/07 19:14:52 (1 year ago)

Author:

vboxsync

Message:

RT_UOFFSETOF

Files:

• trunk/include/iprt/cdefs.h (modified) (2 diffs)

trunk/include/iprt/cdefs.h

@@ -804 +804 @@
-
-/** @def RT_OFFSETOF
-
+, returns a signed result
- *
- * This differs from the usual offsetof() in that it's not relying on builtin
@@ -811 +811 @@
- * with a variable length field.
- *
-
+ signed.
- * @param   type    Structure type.
- * @param   member  Member.
- */
-#define RT_OFFSETOF(type, member)   ( (int)(uintptr_t)&( ((type *)(void *)0)->member) )
+
+/** @def RT_UOFFSETOF
+ * Our own special offsetof() variant, returns an unsigned result.
+ *
+ * This differs from the usual offsetof() in that it's not relying on builtin
+ * compiler stuff and thus can use variables in arrays the structure may
+ * contain. If in this usful to determin the sizes of structures ending
+ * with a variable length field.
+ *
+ * @returns offset into the structure of the specified member. unsigned.
+ * @param   type    Structure type.
+ * @param   member  Member.
+ */
+#define RT_UOFFSETOF(type, member)   ( (uintptr_t)&( ((type *)(void *)0)->member) )
-
-/** @def RT_SIZEOFMEMB