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expand on why magic numbers need to be first in the structure

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Michael Graff
2000-05-11 16:18:01 +00:00
parent 9dff010bd0
commit 3ee8ba5e32
1 changed files with 4 additions and 1 deletions
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5
lib/isc/include/isc/magic.h
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@@ -25,7 +25,10 @@ typedef struct {
/* /*
* To use this macro the magic number MUST be the first thing in the * To use this macro the magic number MUST be the first thing in the
* structure, and MUST be of type "unsigned int" * structure, and MUST be of type "unsigned int".
*
* The intent of this is to allow magic numbers to be checked even though
* the object is otherwise opaque.
*/ */
#define ISC_MAGIC_VALID(a,b) (((a) != NULL) \ #define ISC_MAGIC_VALID(a,b) (((a) != NULL) \
&& (((isc__magic_t *)(a))->magic == (b))) && (((isc__magic_t *)(a))->magic == (b)))