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Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you?

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On 04/02/2012 01:16 PM, Qi wrote:
> Hi all,
> 
> Let me show some code first,
> 
> void someFunction(int param)
> {
>    (void)param; // param is not used in this function. This line is
> // just to silence the compiler warning about unused param.
> }


hi,

this is the way it was often done in C. nowadays you can simply comment
out variable name - it's more compact and readable that way.

there is just one issue with this. when you use some variable only in
debug, but not in release, in the second case you still get warning. for
example:

void doSth(const char *name)
{
  assert(name!=NULL);
  // no other usages of 'name'
}

for this i use other trick, added to a common code part:

template<typename T>
void ignore(const T&) { }

// ...

void doSth(const char *name)
{
  ignore(name);
  assert(name!=NULL);
  // no other usages of 'name'
}

i find it more readable (explicit intentions) than "(void)name".

-- 
pozdrawiam serdecznie / best regards,
bartek szurgot
/* http://www.baszerr.eu */

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Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? Qi <no@no.com> - 2012-04-02 19:16 +0800
  Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? "Fred Zwarts \(KVI\)" <F.Zwarts@KVI.nl> - 2012-04-02 13:39 +0200
    Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? Victor Bazarov <v.bazarov@comcast.invalid> - 2012-04-02 09:49 -0400
      Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? Qi <no@no.com> - 2012-04-02 22:01 +0800
        Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? Victor Bazarov <v.bazarov@comcast.invalid> - 2012-04-02 11:50 -0400
        Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? Paul N <gw7rib@aol.com> - 2012-04-02 12:54 -0700
      Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? Juha Nieminen <nospam@thanks.invalid> - 2012-04-03 05:27 +0000
        Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-04-03 08:02 +0000
          Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? Juha Nieminen <nospam@thanks.invalid> - 2012-04-03 14:19 +0000
    Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? Mike McCarty <mcmccarty@gmail.com> - 2012-04-02 06:43 -0700
  Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? GM <GM@no.spam.it> - 2012-04-02 14:41 +0200
  Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? bartek szurgot <basz@no.spam> - 2012-04-02 16:55 +0200
    Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? Juha Nieminen <nospam@thanks.invalid> - 2012-04-03 05:28 +0000
      Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? Qi <no@no.com> - 2012-04-03 13:54 +0800
        Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? Juha Nieminen <nospam@thanks.invalid> - 2012-04-03 14:09 +0000
          Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? Robert Wessel <robertwessel2@yahoo.com> - 2012-04-03 11:21 -0500
            Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? bartek szurgot <basz@no.spam> - 2012-04-04 17:39 +0200
  Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-04-02 15:13 +0000
  Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? "MikeWhy" <boat042-nospam@yahoo.com> - 2012-04-02 11:37 -0500
    Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? Qi <no@no.com> - 2012-04-03 10:29 +0800
      Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2012-04-03 06:00 +0200
        Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? Qi <no@no.com> - 2012-04-03 13:56 +0800
  Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? goran.pusic@gmail.com - 2012-04-02 04:25 -0700
    Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? scott@slp53.sl.home (Scott Lurndal) - 2012-04-02 22:01 +0000
  Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? Öö Tiib <ootiib@hot.ee> - 2012-04-02 07:37 -0700
  Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? Dombo <dombo@disposable.invalid> - 2012-04-03 19:35 +0200
  Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? Stuart Redmann <DerTopper@web.de> - 2012-04-04 11:56 -0700
  Re: Need your experience: is "(void)param;" to avoid unused variable warnings well known for you? Qi <no@no.no> - 2012-04-05 14:17 +0800

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