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| From | Ben Bacarisse <ben.usenet@bsb.me.uk> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: EXIT_SUCCESS |
| Date | 2016-07-27 15:44 +0100 |
| Organization | A noiseless patient Spider |
| Message-ID | <87h9bbf8d7.fsf@bsb.me.uk> (permalink) |
| References | (11 earlier) <579638b1.119218@news.xs4all.nl> <nn5fgh$4t7$1@dont-email.me> <9c263285-548c-4f42-8d54-94ba1c3628ab@googlegroups.com> <nn78qd$h3u$1@dont-email.me> <db999c15-dd8b-4dbe-9f55-936d56ca32c9@googlegroups.com> |
jadill33@gmail.com writes:
> On Tuesday, July 26, 2016 at 5:00:08 AM UTC-4, David Brown wrote:
>> On 25/07/16 23:41, j...@...com wrote:
>> > On Monday, July 25, 2016 at 12:42:00 PM UTC-4, Richard Heathfield wrote:
>> >> On 25/07/16 17:06, Richard Bos wrote:
>> >>> Richard Heathfield <r...@...uk> wrote:
>> >>>
>> <snip>
>> >>
>> >>> but it only works well if the accepted values of a are
>> >>> contiguous (or nearly so, with at most a handful of ugly extra defaults
>> >>> scattered through the array).
>> >>
>> >> That's right. I fitted the solution to the problem. If the problem
>> >> changes, sometimes the solution changes too (for example, to a perfect
>> >> hash or even some kind of dictionary).
>> >
>> > I think I have you covered here.
>> >
>> > \code
>> <snip linear search>
>> > \endcode
>> >
>> > Refactoring it to mimic your example is left as an exercise for the
>> > reader.
>> >
>>
>> If the accepted values don't fit a nice pattern to allow a simple
>> solution such as Richard's, why not just use a switch?
>
> Depends on the scope of the problem. If it's a one time translation in a
> small embedded system, then a single switch is fine. If you have to
> translate lots of enumerated values to strings for human readability, as
> you might find in a packet analyzer or a MIL-1553 traffic bus monitor,
> then raw coding hundreds of these switch statements is not ideal.
<snip>
> Most of the enumerated value to string tranlations that I have are small.
> I just have a lot of them.
Do you know about the X macro trick (it may have a proper name, but
that's what I call it)? You can use it generate code for arbitrary
lists like this. First, you put you enum into a file (list.h in this
case):
X(red, 42)
X(green, 34)
X(blue, 12)
Here, I've allowed for the full generality with arbitrary numbers. Now
you can define the enum like this:
#define X(name, num) name = num,
enum List {
#include "list.h"
};
and, elsewhere, you can generate the function to map values to strings
like this:
const char *enum_to_str(unsigned int e)
{
switch (e) {
#define X(name, num) case name: return #name;
#include "list.h"
}
return "default";
}
Of course, with consecutive values, you can use similar code to make a
table rather than a switch and the X macro list would just need the name
rather than a name and a value.
<snip>
--
Ben.
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EXIT_SUCCESS Real Troll <real.troll@trolls.com> - 2016-07-08 00:00 -0300
Re: EXIT_SUCCESS luser droog <luser.droog@gmail.com> - 2016-07-07 19:54 -0700
Re: EXIT_SUCCESS Ian Collins <ian-news@hotmail.com> - 2016-07-08 15:03 +1200
Re: EXIT_SUCCESS James Kuyper <jameskuyper@verizon.net> - 2016-07-07 23:20 -0400
Re: EXIT_SUCCESS Richard Heathfield <rjh@cpax.org.uk> - 2016-07-08 10:19 +0100
Re: EXIT_SUCCESS Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-08 03:25 -0700
Re: EXIT_SUCCESS Richard Heathfield <rjh@cpax.org.uk> - 2016-07-08 13:49 +0100
Re: EXIT_SUCCESS Keith Thompson <kst-u@mib.org> - 2016-07-08 08:33 -0700
Re: EXIT_SUCCESS Gareth Owen <gwowen@gmail.com> - 2016-07-08 18:03 +0100
Re: EXIT_SUCCESS Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-08 19:11 +0100
Re: EXIT_SUCCESS "Osmium" <r124c4u102@comcast.net> - 2016-07-08 14:25 -0500
Re: EXIT_SUCCESS Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-08 20:34 +0100
Re: EXIT_SUCCESS Ken Brody <kenbrody@spamcop.net> - 2016-07-11 19:10 -0400
Re: EXIT_SUCCESS Robert Wessel <robertwessel2@yahoo.com> - 2016-07-10 01:21 -0500
Re: EXIT_SUCCESS Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2016-07-10 16:09 -0600
Re: EXIT_SUCCESS Keith Thompson <kst-u@mib.org> - 2016-07-10 16:01 -0700
Re: EXIT_SUCCESS "Osmium" <r124c4u102@comcast.net> - 2016-07-10 18:30 -0500
Re: EXIT_SUCCESS Keith Thompson <kst-u@mib.org> - 2016-07-10 17:00 -0700
Re: EXIT_SUCCESS James Kuyper <jameskuyper@verizon.net> - 2016-07-10 22:43 -0400
Re: EXIT_SUCCESS Siri Cruise <chine.bleu@yahoo.com> - 2016-07-10 22:31 -0700
Re: EXIT_SUCCESS raltbos@xs4all.nl (Richard Bos) - 2016-07-11 08:24 +0000
Re: EXIT_SUCCESS Ken Brody <kenbrody@spamcop.net> - 2016-07-11 19:18 -0400
Re: EXIT_SUCCESS gazelle@shell.xmission.com (Kenny McCormack) - 2016-07-11 00:47 +0000
Re: EXIT_SUCCESS gordonb.0aikd@burditt.org (Gordon Burditt) - 2016-07-12 18:52 -0500
Re: EXIT_SUCCESS "James R. Kuyper" <jameskuyper@verizon.net> - 2016-07-12 20:32 -0400
Re: EXIT_SUCCESS Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2016-07-12 20:59 -0600
Re: EXIT_SUCCESS gordonb.a2m2l@burditt.org (Gordon Burditt) - 2016-07-13 02:11 -0500
Re: EXIT_SUCCESS James Kuyper <jameskuyper@verizon.net> - 2016-07-13 11:26 -0400
Re: EXIT_SUCCESS Keith Thompson <kst-u@mib.org> - 2016-07-13 08:48 -0700
Re: EXIT_SUCCESS Tim Rentsch <txr@alumni.caltech.edu> - 2016-07-18 09:54 -0700
Re: EXIT_SUCCESS James Kuyper <jameskuyper@verizon.net> - 2016-07-08 17:46 -0400
Re: EXIT_SUCCESS Keith Thompson <kst-u@mib.org> - 2016-07-09 13:13 -0700
Re: EXIT_SUCCESS jgh@mdfs.net - 2016-07-25 04:42 -0700
Re: EXIT_SUCCESS Richard Heathfield <rjh@cpax.org.uk> - 2016-07-25 13:07 +0100
Re: EXIT_SUCCESS Udyant Wig <udyant.wig@gmail.com> - 2016-07-25 20:05 +0530
Re: EXIT_SUCCESS raltbos@xs4all.nl (Richard Bos) - 2016-07-25 16:06 +0000
Re: EXIT_SUCCESS Richard Heathfield <rjh@cpax.org.uk> - 2016-07-25 17:41 +0100
Re: EXIT_SUCCESS Keith Thompson <kst-u@mib.org> - 2016-07-25 11:04 -0700
Re: EXIT_SUCCESS Richard Heathfield <rjh@cpax.org.uk> - 2016-07-25 19:14 +0100
Re: EXIT_SUCCESS BartC <bc@freeuk.com> - 2016-07-25 22:00 +0100
Re: EXIT_SUCCESS Richard Heathfield <rjh@cpax.org.uk> - 2016-07-25 22:03 +0100
Re: EXIT_SUCCESS BartC <bc@freeuk.com> - 2016-07-25 22:41 +0100
Re: EXIT_SUCCESS jadill33@gmail.com - 2016-07-25 14:50 -0700
Re: EXIT_SUCCESS Keith Thompson <kst-u@mib.org> - 2016-07-25 15:04 -0700
Re: EXIT_SUCCESS David Brown <david.brown@hesbynett.no> - 2016-07-26 10:43 +0200
Re: EXIT_SUCCESS jadill33@gmail.com - 2016-07-25 14:41 -0700
Re: EXIT_SUCCESS David Brown <david.brown@hesbynett.no> - 2016-07-26 10:59 +0200
Re: EXIT_SUCCESS jadill33@gmail.com - 2016-07-27 06:20 -0700
Re: EXIT_SUCCESS Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-27 15:44 +0100
Re: EXIT_SUCCESS Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-27 16:22 +0100
Re: EXIT_SUCCESS Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2016-07-27 11:20 -0600
Re: EXIT_SUCCESS luser droog <luser.droog@gmail.com> - 2016-07-27 15:32 -0700
Re: EXIT_SUCCESS Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-28 14:47 +0100
Re: EXIT_SUCCESS Keith Thompson <kst-u@mib.org> - 2016-07-25 08:46 -0700
Re: EXIT_SUCCESS David Brown <david.brown@hesbynett.no> - 2016-07-26 12:44 +0200
Re: EXIT_SUCCESS Keith Thompson <kst-u@mib.org> - 2016-07-26 08:24 -0700
Re: EXIT_SUCCESS David Brown <david.brown@hesbynett.no> - 2016-07-26 19:26 +0200
Re: EXIT_SUCCESS BartC <bc@freeuk.com> - 2016-07-26 18:03 +0100
Re: EXIT_SUCCESS Ken Brody <kenbrody@spamcop.net> - 2016-07-11 19:15 -0400
Re: EXIT_SUCCESS supercat@casperkitty.com - 2016-07-11 16:46 -0700
Re: EXIT_SUCCESS raltbos@xs4all.nl (Richard Bos) - 2016-07-15 13:51 +0000
Re: EXIT_SUCCESS supercat@casperkitty.com - 2016-07-15 08:07 -0700
Re: EXIT_SUCCESS Ken Brody <kenbrody@spamcop.net> - 2016-07-15 14:33 -0400
Re: EXIT_SUCCESS raltbos@xs4all.nl (Richard Bos) - 2016-07-23 09:07 +0000
Re: EXIT_SUCCESS Randy Howard <rhoward.mx@EverybodyUsesIt.com> - 2016-07-23 16:44 -0500
Re: EXIT_SUCCESS Ken Brody <kenbrody@spamcop.net> - 2016-07-25 10:36 -0400
Re: EXIT_SUCCESS Randy Howard <rhoward.mx@EverybodyUsesIt.com> - 2016-07-25 15:28 -0500
Re: EXIT_SUCCESS Rosario19 <Ros@invalid.invalid> - 2016-07-18 09:45 +0200
Re: EXIT_SUCCESS gordonb.bitq1@burditt.org (Gordon Burditt) - 2016-07-08 17:56 -0500
Re: EXIT_SUCCESS Keith Thompson <kst-u@mib.org> - 2016-07-08 08:35 -0700
Re: EXIT_SUCCESS luser droog <luser.droog@gmail.com> - 2016-07-31 15:03 -0700
Re: EXIT_SUCCESS Real Troll <real.troll@trolls.com> - 2016-07-31 18:09 -0400
Re: EXIT_SUCCESS luser droog <luser.droog@gmail.com> - 2016-07-31 15:36 -0700
Re: EXIT_SUCCESS James Kuyper <jameskuyper@verizon.net> - 2016-08-01 10:09 -0400
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