From: bill@cafe.net (Kaz Kylheku)
Subject: Re: Which language pays most 17457 -- C++ vs. Java?
Date: 1997/12/24
Date: 1997-12-24T00:00:00+00:00 [thread overview]
Message-ID: <67rjb3$pfb$1@brie.direct.ca> (raw)
In-Reply-To: 34A14C27.57C0@min.net
In article <34A14C27.57C0@min.net>, John Porter <jdporter@min.net> wrote:
>Lawrence Kirby wrote:
>>
>> Aren't the standard library identifiers with external linkage reserved
>> even in a freestandinhg environment?
>
>With the possible exception of environments for embedded development,
>the identifiers defined in the standard or any other library are not
>reserved words. If I don't include string.h, I am free to use the
>id 'memcpy' for my own purposes. Even if I do link with a library which
False. Although 'memcpy' is not a reserved keyword by any means,
it is a reserved 'external name'. External names defined by the C library are
reserved as external names regardless of what header you include.
(An external name is an identifier with external linkage).
Not only are those names reserved, but certain external name SPACES are
reserved! A strictly conforming program may not define any external
name that begins with 'mem' followed by any combination of letters,
digits or underscores. This is true even though the library doesn't
currently define anything else in that category other than 'memcpy'
or 'memmove'. However, 'mem' itself is not reserved because it's
not followed by any letters, digits or underscores. Similarly,
identifiers beginning with 'to' and 'is' are reserved for future
extensions to <ctype.h>, and identifiers starting 'str' are reserved
for future extensions to <string.h>.
I have set up my Vim 5.0 editor to colorize any occurence of an identifier
that belongs to the forbidden name spaces. :)
>defines memcpy, my definition overrides it. I'm not sure how you can
>construe this to mean that 'memcpy' is in any way "reserved".
You are sadly mistaken. In fact your overriding definition must have static
linkage, otherwise your program invokes undefined behavior. Moreover, if you
write such a static function, you must not include the <string.h> header in
the same translation unit, else undefined behavior results.
There is no such thing as ``overriding'' in C. Each external name must
have exactly one definition if it is used anywhere in the program.
Additionally, an external name that is declared but never referenced, is
permitted to be without an external definition.
Overriding of library functions (via ``weak symbols'' or some other such
resolution mechanism) is possible as a system-specific extension.
How I can construe all this is by interpreting the fine words written
in a document entitled _American National Standard for Programming
Languages---C_, ANSI/ISO 9899:1990.
next prev parent reply other threads:[~1997-12-24 0:00 UTC|newest]
Thread overview: 245+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <199712121931.LAA25389@sirius.infonex.com>
1997-12-12 0:00 ` Which language pays most 17457 -- C++ vs. Java? Roedy Green
1997-12-17 0:00 ` Wes Groleau
1997-12-16 0:00 ` steve
1997-12-18 0:00 ` Alicia Carla Longstreet
1997-12-17 0:00 ` steve
1997-12-19 0:00 ` Larry Elmore
1997-12-19 0:00 ` James Giles
[not found] ` <01bd0c0b$53cc1860$26db45cf@juddesk>
1997-12-17 0:00 ` steve
1997-12-18 0:00 ` Peter Seebach
1997-12-17 0:00 ` steve
1997-12-19 0:00 ` Kaz Kylheku
1997-12-17 0:00 ` steve
1997-12-22 0:00 ` Lawrence Kirby
1997-12-21 0:00 ` steve
1997-12-28 0:00 ` Lawrence Kirby
1997-12-18 0:00 ` James Giles
1997-12-17 0:00 ` steve
1997-12-19 0:00 ` James Giles
1997-12-18 0:00 ` steve
1997-12-19 0:00 ` James Giles
1997-12-18 0:00 ` steve
1997-12-19 0:00 ` James Giles
1997-12-22 0:00 ` Lawrence Kirby
1997-12-21 0:00 ` James Giles
1997-12-21 0:00 ` steve
1997-12-30 0:00 ` Chris Gray
1997-12-28 0:00 ` Lawrence Kirby
1997-12-28 0:00 ` John Winters
1997-12-30 0:00 ` paulr
1997-12-31 0:00 ` Which language pays most " arnie sherman
1997-12-30 0:00 ` Dann Corbit
1997-12-31 0:00 ` John Slaman
[not found] ` <01bd198f$4050d960$68c8b5cc@dhite.unicomp.net>
1998-01-06 0:00 ` Jedi
1998-01-10 0:00 ` Highlander Consulting
1998-01-11 0:00 ` Patricia Shanahan
1998-01-11 0:00 ` Barrabazz
1998-01-11 0:00 ` Patricia Shanahan
1998-01-12 0:00 ` Ron Peterson
1998-01-14 0:00 ` anonymous
1998-01-19 0:00 ` Joe Gwinn
[not found] ` <01bd2526$66b70fa0$d6d945cf@juddesk>
1998-01-23 0:00 ` dnns
1998-01-23 0:00 ` Philosophers Nick Roberts
1998-01-23 0:00 ` Spam--> was:Re: Philosophers Dann Corbit
1998-01-24 0:00 ` Nick Roberts
1998-01-26 0:00 ` Doug Miller
1998-01-24 0:00 ` Philosophers Mike Whiten
1998-01-24 0:00 ` Philosophers The Goobers
1998-01-25 0:00 ` Philosophers Arnold Trembley
1998-01-25 0:00 ` Philosophers The Goobers
1998-01-26 0:00 ` :-) Philosophers Giovanni Drogo [drogo@rn.bastiani.it]
1998-01-29 0:00 ` Philosophers Steve Dekorte
1998-01-29 0:00 ` Philosophers The Goobers
1998-01-24 0:00 ` Philosophers John G.
[not found] ` <Pine.LNX.3.95. <34cd2808.10685219@newsroom.tassie.net.au>
1998-01-28 0:00 ` Philosophers docdwarf
[not found] ` <01bd2c40$b62837a0$7261b693@HP5079Q>
1998-01-28 0:00 ` Philosophers The Goobers
1998-02-01 0:00 ` Philosophers Scott Adams
[not found] ` <01bd2cc0$f0042b70$7261b693@HP5079Q>
1998-02-04 0:00 ` Philosophers The Goobers
1998-02-10 0:00 ` Back to the topic of CS students. (was Re: Philosophers) cyanide
1998-02-10 0:00 ` Nick Roberts
1998-01-30 0:00 ` Philosophers jim
1998-01-30 0:00 ` Philosophers Samuel Mize
1998-01-30 0:00 ` Philosophers docdwarf
1998-01-30 0:00 ` Philosophers suzie
1998-01-30 0:00 ` Philosophers docdwarf
1998-01-31 0:00 ` Philosophers Martin Richardson
1998-01-31 0:00 ` Philosophers Jeff York
1998-02-01 0:00 ` Philosophers Martin Richardson
1998-02-02 0:00 ` Philosophers Eddie Armstrong
1998-02-03 0:00 ` Philosophers Nyk Tarr
1998-02-02 0:00 ` Philosophers Jeff York
1998-02-02 0:00 ` Philosophers Pat O'Connell
1998-02-02 0:00 ` Philosophers Robert Garskof
1998-02-02 0:00 ` Philosophers Dave Tholen
1998-02-10 0:00 ` Philosophers cyanide
1998-02-09 0:00 ` Philosophers The Goobers
1998-02-18 0:00 ` Philosophers Mad Hamish
1999-07-29 0:00 ` Philosophers firewind
1998-01-24 0:00 ` Philosophers John G.
1998-02-10 0:00 ` Drifting further off topic cyanide
1998-01-25 0:00 ` Philosophers Jens Schweikhardt
1998-01-28 0:00 ` Philosophers Mad Hamish
1998-01-27 0:00 ` Philosophers Kurt Wall
1998-01-27 0:00 ` Which language pays most -- C++ vs. Java? Robert Garskof
1998-01-28 0:00 ` Steve Dekorte
1998-01-28 0:00 ` Barrabazz
1998-01-28 0:00 ` dogmat
1998-01-29 0:00 ` Tim Oxler
1998-01-29 0:00 ` Tim Oxler
1998-01-29 0:00 ` Joe Gwinn
1998-01-29 0:00 ` Wayne L. Beavers
1998-01-29 0:00 ` Frank A. Adrian
1998-02-03 0:00 ` GLE
1998-02-03 0:00 ` Harold Stevens ** PLEASE SEE SIG **
1998-02-03 0:00 ` The Goobers
1998-01-29 0:00 ` coryb
1998-01-30 0:00 ` Robert S. White
1998-01-30 0:00 ` Patricia Shanahan
1998-01-31 0:00 ` Paul Van Bellinghen
1998-02-01 0:00 ` Nick Roberts
1998-02-09 0:00 ` cyanide
1998-02-10 0:00 ` Bill Lynch
1998-02-10 0:00 ` Michael Rot13 Klein
1998-02-10 0:00 ` Jeff Knaggs
1998-02-10 0:00 ` dogmat
1998-02-09 0:00 ` cyanide
1998-02-10 0:00 ` dogmat
1999-07-29 0:00 ` Edwin Purvee
[not found] ` <01bd2c3c$6726d520$8101b8c7@MIS-RKW95.spartan.com>
1998-02-10 0:00 ` Steve Dekorte
1998-02-10 0:00 ` Bill Lynch
1998-02-11 0:00 ` dogmat
1998-01-29 0:00 ` Joe Gwinn
1998-01-31 0:00 ` Larry Wiggins
1999-07-29 0:00 ` Ben Pfaff
1999-07-29 0:00 ` Kaz Kylheku
[not found] ` <6alu5l$onm$1@owl.slip <01bd2c3c$6726d520$8101b8c7@MIS-RKW95.spartan.com>
1998-02-02 0:00 ` Kaz Kylheku
1998-02-02 0:00 ` Michael C. Kasten
1998-02-02 0:00 ` This thread has drifted miles from its subject line Wes Groleau
[not found] ` <6alu5l$ <34D6243C.2A53@gc057.fw.hac.com>
1998-02-05 0:00 ` Paul Osborn
[not found] ` <6alu5l$onm$1@owl.slip <34E0D798.E29D6CA0@cableol.co.uk>
1998-02-11 0:00 ` Which language pays most -- C++ vs. Java? Kaz Kylheku
[not found] ` <gwinn-1901981219520001@dh5055142. <01bd284c$4b0b4fe0$c0f682c1@xhv46.dial.pipex.com>
1998-01-24 0:00 ` Philosophers Kaz Kylheku
[not found] ` <gwinn-1901981219520001@dh5055142. <34CE059C.634DE881@snet.com>
1998-01-27 0:00 ` Which language pays most -- C++ vs. Java? Kaz Kylheku
1998-01-28 0:00 ` Robert Garskof
[not found] ` <gwinn-1901981219520001@dh5055142. <34C9F3D0.6B5A@erols.com>
1998-01-28 0:00 ` Philosophers Warren B. Focke
1998-01-29 0:00 ` Philosophers The Goobers
1998-02-05 0:00 ` Philosophers Warren B. Focke
1998-02-05 0:00 ` Philosophers The Goobers
1998-02-06 0:00 ` Philosophers dogmat
1998-02-06 0:00 ` Philosophers docdwarf
1998-02-06 0:00 ` Philosophers dogmat
1998-02-06 0:00 ` Philosophers docdwarf
1998-02-06 0:00 ` Philosophers Harold Stevens ** PLEASE SEE SIG **
1998-02-10 0:00 ` Film "Contact" Nick Roberts
1998-02-09 0:00 ` Which language pays most -- C++ vs. Java? cyanide
1998-01-11 0:00 ` Kaz Kylheku
1998-01-11 0:00 ` Carsten Arnholm
1998-01-15 0:00 ` Highlander Consulting
1998-01-16 0:00 ` Charles F Hankel
1999-08-09 0:00 ` Paul Groves
1999-08-09 0:00 ` Kaz Kylheku
1998-01-02 0:00 ` Philip Hunt
1997-12-31 0:00 ` Which language pays most 17457 " Guillermo Schwarz
1997-12-31 0:00 ` Billy Chambless
1998-01-03 0:00 ` Berna L Massingill
1998-01-04 0:00 ` Lawrence Kirby
1997-12-19 0:00 ` Peter Seebach
1997-12-19 0:00 ` James Giles
1997-12-18 0:00 ` steve
1997-12-23 0:00 ` Guillermo Schwarz
1997-12-18 0:00 ` John Seitz
1997-12-18 0:00 ` Robert Robbins
1997-12-19 0:00 ` Mark Wilden
1997-12-19 0:00 ` Ian Upright
1997-12-19 0:00 ` William Murray
1997-12-19 0:00 ` steve
1997-12-20 0:00 ` Robert Munck
1997-12-19 0:00 ` Chip Ling
1997-12-17 0:00 ` James Giles
[not found] ` <349793cb.33600861@news.wxs.nl>
[not found] ` <34923264.75B5@netup.cl>
[not found] ` <670qio$8a$1@sparcserver.lrz-muenchen.de>
[not found] ` <3494B7DA.5463@ici.net>
[not found] ` <34958D16.190C@gsg.eds.com>
[not found] ` <679807$8gm@ws1.emirates.net.ae>
[not found] ` <e9k976.8h3.ln@localhost>
1997-12-18 0:00 ` Klaus-Georg Adams
[not found] ` <67bjnv$j35$1@brie.direct.ca>
[not found] ` <349B0417.D4DB6A30@its.cl>
1997-12-20 0:00 ` Kaz Kylheku
1997-12-20 0:00 ` William J. Leary Jr.
1997-12-20 0:00 ` Kurt Watzka
1997-12-20 0:00 ` William J. Leary Jr.
1997-12-21 0:00 ` Peter Seebach
1997-12-21 0:00 ` Peter Seebach
1997-12-21 0:00 ` William J. Leary Jr.
1997-12-22 0:00 ` Peter Seebach
1997-12-22 0:00 ` Lawrence Kirby
1997-12-22 0:00 ` Kurt Watzka
1997-12-28 0:00 ` Lawrence Kirby
1997-12-22 0:00 ` Kaz Kylheku
1997-12-24 0:00 ` John Porter
1997-12-24 0:00 ` Kaz Kylheku [this message]
1997-12-27 0:00 ` Which language pays most? Smalltalk, not C++ nor Java Guillermo Schwarz
1997-12-27 0:00 ` Joshua Waxman
1997-12-27 0:00 ` Patricia Shanahan
1997-12-27 0:00 ` Robert Dewar
1997-12-29 0:00 ` John Porter
1997-12-29 0:00 ` Kaz Kylheku
1997-12-29 0:00 ` Robert Dewar
[not found] ` <01bd14b4$dc6f6a80$6428b4cf@carla.ici.net>
1997-12-29 0:00 ` Robert Dewar
1997-12-30 0:00 ` Billy Chambless
1997-12-31 0:00 ` David Thornley
1997-12-31 0:00 ` Keith G. Murphy
1998-01-01 0:00 ` Robert Dewar
1998-01-01 0:00 ` Patricia Shanahan
1998-01-02 0:00 ` Robert Dewar
1998-01-02 0:00 ` Peter Seebach
1998-01-02 0:00 ` firewind
1998-01-02 0:00 ` Ian Piumarta
1998-01-03 0:00 ` Richard Kenner
1998-01-02 0:00 ` Robert Dewar
1998-01-02 0:00 ` Shelly Mujtaba
1998-01-02 0:00 ` Guillermo Schwarz
1998-01-03 0:00 ` Jacqueline U. Robertson
1998-01-03 0:00 ` Dean Roddey
1998-01-03 0:00 ` Jacqueline U. Robertson
1998-01-03 0:00 ` Dean Roddey
1998-01-05 0:00 ` Guillermo Schwarz
1998-01-05 0:00 ` Kaz Kylheku
1998-01-03 0:00 ` Lawrence Kirby
1997-12-29 0:00 ` Lawrence Kirby
1997-12-29 0:00 ` Patricia Shanahan
[not found] ` <01bd147e$11496760$6a28b4cf@carla.ici.net>
1997-12-29 0:00 ` Billy Chambless
1997-12-30 0:00 ` Jeffrey Templon
1997-12-30 0:00 ` Patricia Shanahan
1997-12-30 0:00 ` Charles R Martin
1998-01-03 0:00 ` Lawrence Kirby
1998-01-28 0:00 ` SmallTalk Execute files Thaminda Erangane Perera
1998-01-28 0:00 ` Dann Corbit
1998-01-29 0:00 ` Griff Lewis
1997-12-28 0:00 ` Which language pays most? Smalltalk, not C++ nor Java Kurt Watzka
1997-12-29 0:00 ` Guillermo Schwarz
1997-12-29 0:00 ` Kaz Kylheku
1997-12-30 0:00 ` Billy Chambless
1997-12-30 0:00 ` Lawrence Kirby
1997-12-30 0:00 ` Patricia Shanahan
1998-01-03 0:00 ` Lawrence Kirby
1998-01-03 0:00 ` Patricia Shanahan
1997-12-30 0:00 ` Kaz Kylheku
1997-12-30 0:00 ` Joshua Waxman
1997-12-30 0:00 ` firewind
1997-12-30 0:00 ` Joshua Waxman
1997-12-31 0:00 ` Robert Dewar
1997-12-31 0:00 ` Brock
1997-12-31 0:00 ` Joshua Waxman
1997-12-31 0:00 ` Dann Corbit
1998-01-01 0:00 ` firewind
1997-12-30 0:00 ` Kaz Kylheku
1997-12-30 0:00 ` Joshua Waxman
1997-12-30 0:00 ` Robert Dewar
1997-12-30 0:00 ` Dann Corbit
1997-12-31 0:00 ` John Porter
1997-12-31 0:00 ` Jon S Anthony
1998-01-02 0:00 ` Robert Dewar
1997-12-31 0:00 ` David Thornley
1997-12-31 0:00 ` Robert Dewar
1997-12-30 0:00 ` Robert Dewar
1997-12-30 0:00 ` Kaz Kylheku
1997-12-29 0:00 ` Kaz Kylheku
1997-12-29 0:00 ` Kaz Kylheku
1998-01-02 0:00 ` Tor Iver Wilhelmsen
1997-12-25 0:00 ` Which language pays most 17457 -- C++ vs. Java? Kurt Watzka
1997-12-19 0:00 ` Quowong P Liu
1997-12-19 0:00 ` William J. Leary Jr.
1997-12-24 0:00 ` Richard D Riehle
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