Re: Error codes vs. exceptions

From	Ian Collins <ian-news@hotmail.com>
Newsgroups	comp.programming, comp.lang.c++
Subject	Re: Error codes vs. exceptions
Date	2012-06-01 09:08 +1200
Message-ID	<a2q4u5F8ecU1@mid.individual.net> (permalink)
References	<4f571f71-55ca-4922-b81b-31f954cac855@kw17g2000pbb.googlegroups.com> <4fc4760a$0$6567$9b4e6d93@newsspool4.arcor-online.net> <a91cf1eb-f546-4ac6-b287-c908a30197f1@x6g2000pbh.googlegroups.com>

Cross-posted to 2 groups.

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On 06/ 1/12 08:52 AM, mike3 wrote:
> On May 29, 1:08 am, Marcel Müller<news.5.ma...@spamgourmet.com>
> wrote:
> <snip>
>>> Would that be OK or excessive use of exceptions? And if we
>>> are to mix error codes and exceptions, does this mean we should have
>>> the lists of codes and exceptions correspond + a translator to
>>> translate between the two?
>>
>> Converting an error code into an exception might be a good idea. But the
>> other way around is most likely not.
>>
>> And another rule of thumb: the number of exceptions thrown during the
>> processing of a complete request should be finite. I.e. it must not
>> scale with the amount of data processed.
>>
>> Marcel
>
> So does this mean we should have an exception class defined for every
> error code, so we can do that "conversion"?

That really depends what you intend to do when you catch one.  I tend to 
use an exception type for a family of error codes and include the actual 
code in there.  Most of my simple applications just catch the base 
exception (std::runtime_error), send the result of what() to cerr and exit.

If the application can recover from a specific type of exception, I'll 
catch those a perform whatever recovery or reporting is required.

-- 
Ian Collins

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Error codes vs. exceptions mike3 <mike4ty4@yahoo.com> - 2012-05-28 21:15 -0700
  Re: Error codes vs. exceptions BGB <cr88192@hotmail.com> - 2012-05-29 00:10 -0500
    Re: Error codes vs. exceptions mike3 <mike4ty4@yahoo.com> - 2012-05-28 22:41 -0700
      Re: Error codes vs. exceptions BGB <cr88192@hotmail.com> - 2012-05-29 01:34 -0500
    Re: Error codes vs. exceptions Adam Skutt <askutt@gmail.com> - 2012-05-29 07:16 -0700
      Re: Error codes vs. exceptions BGB <cr88192@hotmail.com> - 2012-05-29 09:45 -0500
  Re: Error codes vs. exceptions Marcel Müller <news.5.maazl@spamgourmet.com> - 2012-05-29 09:08 +0200
    Re: Error codes vs. exceptions mike3 <mike4ty4@yahoo.com> - 2012-05-31 13:52 -0700
      Re: Error codes vs. exceptions Ian Collins <ian-news@hotmail.com> - 2012-06-01 09:08 +1200
        Re: Error codes vs. exceptions mike3 <mike4ty4@yahoo.com> - 2012-05-31 22:32 -0700
  Re: Error codes vs. exceptions "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> - 2012-05-29 09:37 +0200
  Re: Error codes vs. exceptions "io_x" <a@b.c.invalid> - 2012-05-29 10:00 +0200
  Re: Error codes vs. exceptions Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-05-29 12:24 +0000
  Re: Error codes vs. exceptions Nobody <nobody@nowhere.com> - 2012-05-30 15:23 +0100
    Re: Error codes vs. exceptions BGB <cr88192@hotmail.com> - 2012-05-30 09:40 -0500
      Re: Error codes vs. exceptions Adam Skutt <askutt@gmail.com> - 2012-05-30 08:04 -0700
        Re: Error codes vs. exceptions BGB <cr88192@hotmail.com> - 2012-05-30 12:01 -0500
  Re: Error codes vs. exceptions Jeff Flinn <TriumphSprint2000@hotmail.com> - 2012-05-30 14:18 -0400
    Re: Error codes vs. exceptions Patricia Shanahan <pats@acm.org> - 2012-05-30 13:00 -0700
    Re: Error codes vs. exceptions Adam Skutt <askutt@gmail.com> - 2012-05-30 21:25 -0700
  Re: Error codes vs. exceptions Pavel <pauldontspamtolk@removeyourself.dontspam.yahoo> - 2012-05-30 22:44 -0400
    Re: Error codes vs. exceptions Nobody <nobody@nowhere.com> - 2012-05-31 05:04 +0100
    Re: Error codes vs. exceptions Pavel <pauldontspamtolk@removeyourself.dontspam.yahoo> - 2012-06-01 21:44 -0400
  Re: Error codes vs. exceptions "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2012-06-02 08:39 +0200
    Re: Error codes vs. exceptions BGB <cr88192@hotmail.com> - 2012-06-02 16:31 -0500
    Re: Error codes vs. exceptions mike3 <mike4ty4@yahoo.com> - 2012-06-02 15:49 -0700
      Re: Error codes vs. exceptions Ian Collins <ian-news@hotmail.com> - 2012-06-03 11:17 +1200
      Re: Error codes vs. exceptions Rui Maciel <rui.maciel@gmail.com> - 2012-06-03 16:38 +0100
    Re: Error codes vs. exceptions Pavel <pauldontspamtolk@removeyourself.dontspam.yahoo> - 2012-06-03 20:26 -0400
  Re: Error codes vs. exceptions gremnebulin <peterdjones@yahoo.com> - 2012-06-20 12:05 -0700

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