Mercurial > molko

diff libmlk-core/mlk/core/util.h @ 629:fee7bd30725c

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rpg: cleanup tileset-loader-file
author David Demelier <markand@malikania.fr>
date Sat, 26 Aug 2023 16:09:35 +0200
parents 509b395171f2
children 3d238b43a9aa
line wrap: on
line diff
--- a/libmlk-core/mlk/core/util.h	Sat Aug 26 15:36:07 2023 +0200
+++ b/libmlk-core/mlk/core/util.h	Sat Aug 26 16:09:35 2023 +0200
@@ -24,6 +24,7 @@
  * \brief libmlk-core utilities
  */
 
+#include <stddef.h>
 #include <stdint.h>
 
 /**
@@ -34,6 +35,12 @@
  */
 #define MLK_UTIL_SIZE(x) (sizeof ((x)) / sizeof ((x)[0]))
 
+/**
+ * Obtain parent container from a member field.
+ */
+#define MLK_CONTAINER_OF(ptr, type, member) \
+	((type*)((char*)(1 ? (ptr) : &((type*)0)->member) - offsetof(type, member)))
+
 #if defined(__cplusplus)
 extern "C" {
 #endif