1 files changed, 6 insertions, 1 deletions

diff --git a/ltable.h b/ltable.h
index a6dc17d9..f377c009 100644
--- a/ltable.h
+++ b/ltable.h
@@ -1,5 +1,5 @@
 /*
-** $Id: ltable.h,v 2.16 2011/08/17 20:26:47 roberto Exp roberto $
+** $Id: ltable.h,v 2.17 2013/04/26 15:39:25 roberto Exp roberto $
 ** Lua tables (hash)
 ** See Copyright Notice in lua.h
 */
@@ -18,6 +18,11 @@
 #define invalidateTMcache(t)    ((t)->flags = 0)
 
 
+/* returns the key, given the value of a table entry */
+#define keyfromval(v) \
+  (gkey(cast(Node *, cast(char *, (v)) - offsetof(Node, i_val))))
+
+
 LUAI_FUNC const TValue *luaH_getint (Table *t, lua_Integer key);
 LUAI_FUNC void luaH_setint (lua_State *L, Table *t, lua_Integer key,
                             TValue *value);