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Programming > C Moderated > Non-null pointe...
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Non-null pointers in C/C++?

by angel_tsankov <fn42551@[EMAIL PROTECTED] > May 13, 2008 at 01:06 AM

It's been some time since I started wondering why the C/C++ languages
do not have a non-null pointer (something like a copyable C++
reference)? In my opinion, using non-null pointers instead of the
"traditional" ones (wherever appropriate) would provide the following
benefits:
-allows restrictive programming techniques to be apllied at a lower
cost (e.g. if a pointer passed to a function may not be null, there
would be no need for a null-check before dereferencing it);
-allow for improvements in programming practices (having two types of
pointers will bring to attention the difference between them, namely
the possibility that "traditional" pointers can be null, hopefully
thus making it more obvious that "traditional" pointers should be
checked for null before thay are dereferenced);
-allow for more reliable code (having a "traditional" pointer where a
non-null pointer would do increases the risk of undefined behavior; on
the other hand, using a non-null pointer instead would be safer);
-provide compilers with further semantic information, thus enabling
them to perform more optimizations;
-make source code more concise (as a result of having fewer null-tests
when replacing "traditional" pointers with non-null ones).

What do you think?
-- 
comp.lang.c.moderated - moderation address: clcm@[EMAIL PROTECTED]
 -- you must
have an appropriate newsgroups line in your header for your mail to be
seen,
or the newsgroup name in square brackets in the subject line.  Sorry.
 




 41 Posts in Topic:
Non-null pointers in C/C++?
angel_tsankov <fn42551  2008-05-13 01:06:32 
Re: Non-null pointers in C/C++?
Francis Glassborow <fr  2008-05-15 11:00:31 
Re: Non-null pointers in C/C++?
"Wojtek Lerch"   2008-05-22 16:51:34 
Re: Non-null pointers in C/C++?
gordonb.ll93b@[EMAIL PROT  2008-05-23 15:57:23 
Re: Non-null pointers in C/C++?
"Wojtek Lerch"   2008-05-24 18:15:37 
Re: Non-null pointers in C/C++?
angel_tsankov <fn42551  2008-05-22 16:51:43 
Re: Non-null pointers in C/C++?
jameskuyper@[EMAIL PROTEC  2008-05-23 15:57:09 
Re: Non-null pointers in C/C++?
angel_tsankov <fn42551  2008-05-28 13:35:14 
Re: Non-null pointers in C/C++?
James Kuyper <jameskuy  2008-05-29 10:58:00 
Re: Non-null pointers in C/C++?
James Kuyper <jameskuy  2008-06-01 12:35:06 
Re: Non-null pointers in C/C++?
angel_tsankov <fn42551  2008-06-01 12:35:16 
Re: Non-null pointers in C/C++?
James Kuyper <jameskuy  2008-06-02 11:54:23 
Re: Non-null pointers in C/C++?
angel_tsankov <fn42551  2008-06-10 00:56:47 
Re: Non-null pointers in C/C++?
James Kuyper <jameskuy  2008-06-12 19:25:13 
Re: Non-null pointers in C/C++?
angel_tsankov <fn42551  2008-06-14 03:02:07 
Re: Non-null pointers in C/C++?
angel_tsankov <fn42551  2008-06-18 08:45:23 
Re: Non-null pointers in C/C++?
angel_tsankov <fn42551  2008-06-18 08:45:31 
Re: Non-null pointers in C/C++?
angel_tsankov <fn42551  2008-06-28 19:04:48 
Re: Non-null pointers in C/C++?
gordon@[EMAIL PROTECTED]   2008-07-04 01:45:57 
Re: Non-null pointers in C/C++?
"Angel Tsankov"  2008-07-08 21:18:29 
Re: Non-null pointers in C/C++?
gordonb.4ax5t@[EMAIL PROT  2008-07-10 13:02:14 
Re: Non-null pointers in C/C++?
"Angel Tsankov"  2008-07-12 18:10:36 
Re: Non-null pointers in C/C++?
gordonb.4dbn6@[EMAIL PROT  2008-07-13 10:55:33 
Re: Non-null pointers in C/C++?
"Angel Tsankov"  2008-07-20 15:07:13 
Re: Non-null pointers in C/C++?
James Kuyper <jameskuy  2008-07-21 18:28:00 
Re: Non-null pointers in C/C++?
"Angel Tsankov"  2008-07-23 22:51:02 
Re: Non-null pointers in C/C++?
James Kuyper <jameskuy  2008-07-25 12:15:29 
Re: Non-null pointers in C/C++?
Jasen Betts <jasen@[EM  2008-07-20 15:07:47 
Re: Non-null pointers in C/C++?
"Angel Tsankov"  2008-07-21 18:28:13 
Re: Non-null pointers in C/C++?
Francis Glassborow <fr  2008-07-04 01:46:17 
Re: Non-null pointers in C/C++?
James Kuyper <jameskuy  2008-06-12 19:32:35 
Re: Non-null pointers in C/C++?
Philip Lantz <prl@[EMA  2008-06-14 03:01:41 
Re: Non-null pointers in C/C++?
=?ISO-8859-1?Q?Hans-Bernh  2008-05-15 11:00:41 
Re: Non-null pointers in C/C++?
"Wojtek Lerch"   2008-05-22 16:51:39 
Re: Non-null pointers in C/C++?
angel_tsankov <fn42551  2008-05-22 16:51:46 
Re: Non-null pointers in C/C++?
Jonathan Leffler <jlef  2008-05-24 18:15:49 
Re: Non-null pointers in C/C++?
gordonb.vehsx@[EMAIL PROT  2008-05-15 11:00:54 
Re: Non-null pointers in C/C++?
Eric Sosman <Eric.Sosm  2008-05-22 16:51:21 
Re: Non-null pointers in C/C++?
angel_tsankov <fn42551  2008-05-22 16:51:53 
Re: Non-null pointers in C/C++?
Matthias Buelow <mkb@[  2008-05-23 15:57:49 
Re: Non-null pointers in C/C++?
Roberto Waltman <usene  2008-06-10 00:57:00 

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