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stddef: add typeof macro

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anna 2021-08-01 17:06:08 +02:00
parent 3aa2c53893
commit abb526f655
Signed by: fef
GPG key ID: EC22E476DC2D3D84
1 changed files with 10 additions and 1 deletions
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11
include/stddef.h
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@ -12,9 +12,18 @@
* @param member: The member inside the struct to the offset of. * @param member: The member inside the struct to the offset of.
* @returns The offset of `member` reelative to `type`, casted to a `size_t`. * @returns The offset of `member` reelative to `type`, casted to a `size_t`.
*/ */
#define offsetof(type, member) ((size_t)&((type *)0)->member) #define offsetof(type, member) __builtin_offsetof(type, member)
#endif /* offsetof */ #endif /* offsetof */
#ifndef typeof
/**
* @brief Get the type `expr` evaluates to (for generic macros).
*
* @param expr Expression to get the type of
*/
#define typeof(expr) __typeof(expr)
#endif
#ifndef NULL #ifndef NULL
/** The `NULL` pointer. */ /** The `NULL` pointer. */
#define NULL ((void *)0) #define NULL ((void *)0)