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| From | David Brown <david.brown@hesbynett.no> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: Generic read/write function - casting vs union |
| Date | 2016-09-22 15:10 +0200 |
| Organization | A noiseless patient Spider |
| Message-ID | <ns0l81$2mb$1@dont-email.me> (permalink) |
| References | <ns08ge$o5v$1@dont-email.me> <ns0hps$mc6$1@dont-email.me> <ns0jt5$tfh$1@dont-email.me> |
On 22/09/16 14:46, Noob wrote: > > As you allude to, there is some context between PROLOG and EPILOG. > > PROLOG does several "setup" operations, which must be "torn down" > in the reverse order in EPILOG, with proper error-handling, meaning > we cannot tear down a resource that has not been set up. > > PROLOG: > alloc #1 > if (failure) goto L1; > alloc #2 > if (failure) goto L2; > alloc #3 > if (failure) goto L3; > > EPILOG: > tear_down(#3); > L3: > tear_down(#2); > L2: > tear_down(#1); > L1: > return err; > > Also I'm not a fan of separating PROLOG and EPILOG, because they > are obviously closely related, and it doesn't make sense to call > one without the other. But it's interesting to have other points > of view. > > Regards. > How portable does your code need to be? If you can use gcc extensions, you could consider using "cleanup" functions as a sort of C++ destructor. Then your code becomes: PROLOG: alloc #1 with cleanup function 1 if (failure) return err; alloc #2 with cleanup function 2 if (failure) return err; alloc #3 with cleanup function 3 if (failure) return err; ... EPILOG: return success Your cleanup functions are called in reverse order, and only if your code has got as far as declaring them. Of course, you could also use C++ and RAII :-)
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Generic read/write function - casting vs union Noob <root@127.0.0.1> - 2016-09-22 11:33 +0200
Re: Generic read/write function - casting vs union Richard Heathfield <rjh@cpax.org.uk> - 2016-09-22 11:07 +0100
Re: Generic read/write function - casting vs union Noob <root@127.0.0.1> - 2016-09-22 12:36 +0200
Re: Generic read/write function - casting vs union Richard Heathfield <rjh@cpax.org.uk> - 2016-09-22 14:07 +0100
Re: Generic read/write function - casting vs union Keith Thompson <kst-u@mib.org> - 2016-09-22 11:48 -0700
Re: Generic read/write function - casting vs union raltbos@xs4all.nl (Richard Bos) - 2016-09-23 19:42 +0000
Re: Generic read/write function - casting vs union BartC <bc@freeuk.com> - 2016-09-22 13:11 +0100
Re: Generic read/write function - casting vs union Noob <root@127.0.0.1> - 2016-09-22 14:46 +0200
Re: Generic read/write function - casting vs union David Brown <david.brown@hesbynett.no> - 2016-09-22 15:10 +0200
Re: Generic read/write function - casting vs union Noob <root@127.0.0.1> - 2016-09-22 15:36 +0200
Re: Generic read/write function - casting vs union Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-09-22 19:28 -0700
Re: Generic read/write function - casting vs union David Brown <david.brown@hesbynett.no> - 2016-09-23 09:59 +0200
Re: Generic read/write function - casting vs union Barry Schwarz <schwarzb@dqel.com> - 2016-09-22 20:11 -0700
Re: Generic read/write function - casting vs union Richard Damon <Richard@Damon-Family.org> - 2016-09-23 11:13 -0400
Re: Generic read/write function - casting vs union Tim Rentsch <txr@alumni.caltech.edu> - 2016-09-22 08:35 -0700
Re: Generic read/write function - casting vs union Noob <root@127.0.0.1> - 2016-09-25 23:17 +0200
Re: Generic read/write function - casting vs union Noob <root@127.0.0.1> - 2016-09-26 14:54 +0200
Re: Generic read/write function - casting vs union boon <root@localhost.localdomain> - 2016-09-26 19:47 +0200
Re: Generic read/write function - casting vs union Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-09-26 19:23 +0100
Re: Generic read/write function - casting vs union Tim Rentsch <txr@alumni.caltech.edu> - 2016-09-27 13:10 -0700
Re: Generic read/write function - casting vs union David Thompson <dave.thompson2@verizon.net> - 2016-10-16 18:08 -0400
Re: Generic read/write function - casting vs union Anton Shepelev <anton.txt@gmail.com> - 2016-10-17 23:40 +0300
Re: Generic read/write function - casting vs union albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2016-12-11 15:20 +0100
Re: Generic read/write function - casting vs union supercat@casperkitty.com - 2016-12-11 09:38 -0800
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