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queue: strengthen type checks

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Rewrite some of the macros in a way that:

  a) makes them more likely to trigger compile-time errors if used
     inappropriately, and

  b) makes C++ compilers happy
This commit is contained in:
Ben Noordhuis 2013-11-01 12:41:09 +01:00
parent 3c172ea74c
commit 0520464870
1 changed files with 6 additions and 6 deletions
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12
src/queue.h
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@ -19,20 +19,20 @@
typedef void *QUEUE[2];
/* Private macros. */
#define QUEUE_NEXT(q) ((*(q))[0])
#define QUEUE_PREV(q) ((*(q))[1])
#define QUEUE_PREV_NEXT(q) (QUEUE_NEXT((QUEUE *) QUEUE_PREV(q)))
#define QUEUE_NEXT_PREV(q) (QUEUE_PREV((QUEUE *) QUEUE_NEXT(q)))
#define QUEUE_NEXT(q) (*(QUEUE **) &((*(q))[0]))
#define QUEUE_PREV(q) (*(QUEUE **) &((*(q))[1]))
#define QUEUE_PREV_NEXT(q) (QUEUE_NEXT(QUEUE_PREV(q)))
#define QUEUE_NEXT_PREV(q) (QUEUE_PREV(QUEUE_NEXT(q)))
/* Public macros. */
#define QUEUE_DATA(ptr, type, field) \
((type *) ((char *) (ptr) - ((char *) &((type *) 0)->field)))
#define QUEUE_FOREACH(q, h) \
for ((q) = (QUEUE *) (*(h))[0]; (q) != (h); (q) = (QUEUE *) (*(q))[0])
for ((q) = QUEUE_NEXT(h); (q) != (h); (q) = QUEUE_NEXT(q))
#define QUEUE_EMPTY(q) \
(QUEUE_NEXT(q) == (q))
((const QUEUE *) (q) == (const QUEUE *) QUEUE_NEXT(q))
#define QUEUE_HEAD(q) \
(QUEUE_NEXT(q))