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| author | jan.nijtmans <nijtmans@users.sourceforge.net> | 2019-06-15 20:41:14 (GMT) |
|---|---|---|
| committer | jan.nijtmans <nijtmans@users.sourceforge.net> | 2019-06-15 20:41:14 (GMT) |
| commit | 3bf66eee9133ac628425b0b83043f65da1f6f8ac (patch) | |
| tree | 19c0a06f718fda6bb89d0718f2e80031ffd5ac56 /generic/tk.h | |
| parent | 408f37c9f38c74cfc41595ebeaedcc830f25d845 (diff) | |
| download | tk-3bf66eee9133ac628425b0b83043f65da1f6f8ac.zip tk-3bf66eee9133ac628425b0b83043f65da1f6f8ac.tar.gz tk-3bf66eee9133ac628425b0b83043f65da1f6f8ac.tar.bz2 | |
Define offsetof() macro for (very rare) platforms which don't have it. Don't punish developers for using offsetof() in extensions, forgetting that ...
Diffstat (limited to 'generic/tk.h')
| -rw-r--r-- | generic/tk.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/generic/tk.h b/generic/tk.h index bf43b41..2a3d602 100644 --- a/generic/tk.h +++ b/generic/tk.h @@ -250,10 +250,10 @@ typedef struct Tk_ObjCustomOption { * Computes number of bytes from beginning of structure to a given field. */ -#ifdef offsetof #define Tk_Offset(type, field) ((int) offsetof(type, field)) -#else -#define Tk_Offset(type, field) ((int) ((char *) &((type *) 0)->field)) +/* Workaround for platforms missing offsetof(), e.g. VC++ 6.0 */ +#ifndef offsetof +# define offsetof(type, field) ((size_t) ((char *) &((type *) 0)->field)) #endif /* |