User: Password:
|
|
Subscribe / Log in / New account

C and C++ could have non_nullable pointers, easily

C and C++ could have non_nullable pointers, easily

Posted Sep 9, 2009 6:59 UTC (Wed) by cmccabe (guest, #60281)
In reply to: C and C++ could have non_nullable pointers, easily by nix
Parent article: Null pointers, one month later

I actually don't see what the big deal is with ERR_PTR and friends.

In higher level languages like OCaml, Java, etc., when you encounter an unrecoverable error in a function, you throw an exception. Then the function has no return value-- control just passes directly to the relevant catch() block.

ERR_PTR is the same thing. Normally, the function would return a foo pointer, but an unrecoverable error happened. So you get an error code instead. As a bonus, if you forget to check for the error code, you get a guaranteed crash (well, if some bonehead hasn't allowed the page starting at address 0 to be mapped). I say "bonus" because the alternative is usually a nondeterministic crash.


(Log in to post comments)


Copyright © 2017, Eklektix, Inc.
Comments and public postings are copyrighted by their creators.
Linux is a registered trademark of Linus Torvalds