On Tue, 1 Mar 2022 18:09:14 +0000, Seymour J Metz wrote: >Is nullptr an address of 0, or is it an address guarantied to not be valid? > Ah, pedantry! It depends on whether "invalid" is equivalent to "unequal to a pointer to any object ..." (or whether one implies the other.). The statement below does not constrain the storage representation of NULL (as in type-punning). I believe the behavior of "if ( NULL ) ..." (specified elsewhere) requires that (intt) NULL be zero.
Cases to consider: o a putative pointer to the interior of a multi-byte object o an arbitrary int value cast to (void *) o a pointer to a free()ed object. >�An integer constant expression with the value 0, or such an expression cast >to type void *, is called a null pointer constant. If a null pointer constant >is converted to a pointer type, the resulting pointer, called a null pointer, >is guaranteed to compare unequal to a pointer to any object or function.� -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
