From 840268400dc8fda62a14f8a084e8b1ea46619454 Mon Sep 17 00:00:00 2001 From: Bram Moolenaar Date: Sun, 17 Jul 2016 20:37:43 +0200 Subject: patch 7.4.2062 Problem: Using dummy variable to compute struct member offset. Solution: Use offsetof(). --- src/macros.h | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'src/macros.h') diff --git a/src/macros.h b/src/macros.h index ca54cb42e0..ae784d6cc1 100644 --- a/src/macros.h +++ b/src/macros.h @@ -353,3 +353,14 @@ # endif # endif #endif + +/* + * In a hashtab item "hi_key" points to "di_key" in a dictitem. + * This avoids adding a pointer to the hashtab item. + * DI2HIKEY() converts a dictitem pointer to a hashitem key pointer. + * HIKEY2DI() converts a hashitem key pointer to a dictitem pointer. + * HI2DI() converts a hashitem pointer to a dictitem pointer. + */ +# define DI2HIKEY(di) ((di)->di_key) +# define HIKEY2DI(p) ((dictitem_T *)(p - offsetof(dictitem_T, di_key))) +# define HI2DI(hi) HIKEY2DI((hi)->hi_key) -- cgit v1.2.3