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BLI_listbase: add utility macro for looping over lists with an index

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Add to the 2.90 branch to avoid problems if fixes from master use it.
This commit is contained in:
Campbell Barton 2020-08-19 13:36:57 +10:00
parent d5b5b228e4
commit 762e4cf221
2 changed files with 9 additions and 0 deletions
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1
.clang-format
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@ -236,6 +236,7 @@ ForEachMacros:
- LISTBASE_CIRCULAR_FORWARD_BEGIN
- LISTBASE_FOREACH
- LISTBASE_FOREACH_BACKWARD
- LISTBASE_FOREACH_INDEX
- LISTBASE_FOREACH_MUTABLE
- LISTBASE_FOREACH_BACKWARD_MUTABLE
- MAN_ITER_AXES_BEGIN

8
source/blender/blenlib/BLI_listbase.h
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@ -186,6 +186,14 @@ struct LinkData *BLI_genericNodeN(void *data);
((var != NULL) ? ((void)(var##_iter_prev = (type)(((Link *)(var))->prev)), 1) : 0); \
var = var##_iter_prev)
/**
* A version of #LISTBASE_FOREACH that takes an index variable (declared outside this macro).
* This avoids possible accidents where using `continue` could miss incrementing the counter.
*/
#define LISTBASE_FOREACH_INDEX(type, var, list, index_var) \
for (type var = (((void)(index_var = 0)), (type)((list)->first)); var != NULL; \
var = (type)(((Link *)(var))->next), index_var++)
#ifdef __cplusplus
}
#endif