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BLI_utildefines: add pointer offset macro

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Handy since it keeps the type of the original.
This commit is contained in:
Campbell Barton 2015-02-23 13:50:12 +11:00
parent 765b842f95
commit c26fa67bcd
1 changed files with 8 additions and 0 deletions
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8
source/blender/blenlib/BLI_utildefines.h
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@ -481,6 +481,14 @@ extern "C" {
/* reusable ELEM macro */
#define ARRAY_SET_ITEMS(...) { VA_NARGS_CALL_OVERLOAD(_VA_ARRAY_SET_ITEMS, __VA_ARGS__); } (void)0
#if defined(__GNUC__) || defined(__clang__)
#define POINTER_OFFSET(v, ofs) \
((typeof(v))((char *)(v) + ofs))
#else
#define POINTER_OFFSET(v, ofs) \
((void *)((char *)(v) + ofs))
#endif
/* Like offsetof(typeof(), member), for non-gcc compilers */
#define OFFSETOF_STRUCT(_struct, _member) \
((((char *)&((_struct)->_member)) - ((char *)(_struct))) + sizeof((_struct)->_member))