introduce container_.of.h

see title Signed-off-by: Denis Pronin <Pronin.D@raidix.com>
dpronin · Jul 30, 2023 · eb6ef3c · eb6ef3c
1 parent 68c7b1b
commit eb6ef3c
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Showing 2 changed files with 28 additions and 9 deletions.
diff --git a/container_of.h b/container_of.h
@@ -0,0 +1,26 @@
+#ifndef _CONTAINER_OF_H
+#define _CONTAINER_OF_H
+
+#ifdef __cplusplus
+
+#include <cstdlib>
+#include <cstddef>
+
+extern "C" {
+
+#define container_of(ptr, type, member)  ({         \
+    auto const *__mptr = static_cast<__typeof__( ((type *)0)->member ) const*>(ptr);    \
+    (type *)( (char *)__mptr - offsetof(type,member) );})
+}
+
+#else // __cplusplus
+
+#include <stdlib.h>
+#include <stddef.h>
+
+#define container_of(ptr, type, member)  ({			\
+	const __typeof__( ((type *)0)->member ) *__mptr = (ptr);	\
+	(type *)( (char *)__mptr - offsetof(type,member) );})
+#endif
+
+#endif // _CONTAINER_OF_H
diff --git a/flist.h b/flist.h
@@ -4,17 +4,10 @@
 #include <stdlib.h>
 #include <stddef.h>
 
-#ifdef __cplusplus
+#include "container_of.h"
 
+#ifdef __cplusplus
 extern "C" {
-
-#define container_of(ptr, type, member)  ({         \
-    auto const *__mptr = static_cast<__typeof__( ((type *)0)->member ) const*>(ptr);    \
-    (type *)( (char *)__mptr - offsetof(type,member) );})
-#else
-#define container_of(ptr, type, member)  ({			\
-	const __typeof__( ((type *)0)->member ) *__mptr = (ptr);	\
-	(type *)( (char *)__mptr - offsetof(type,member) );})
 #endif
 
 /*