Re: unused variables...

From:

"Jim Langston" <tazmaster@rocketmail.com>

Newsgroups:

comp.lang.c++

Date:

Thu, 5 Jul 2007 04:53:19 -0700

Message-ID:

<4Z4ji.870$5l4.206@newsfe06.lga>

"werasm" <werasm@gmail.com> wrote in message
news:1183633410.071189.324130@m36g2000hse.googlegroups.com...

Zeppe wrote:

werasm wrote:

Hi all,

I'm looking for a nice clean (portable) way to get rid of unused
variable warnings without fiddling with compiler settings (on a per
case basis). I've come up with this:

template <class T>
inline void valueUsed( const T& ){}

Do you mean removing the variable name from the function declaration?

No. I have a utility called action at scope end that basically calls a
functor at scope end. I usually bind it to a reference that goes out
of scope at the end of a function (as it is not copyable). It works
well, but has the problem that it riddles my build with "unused
variable" errors unnecessarily. This is what I came up with to make
the problem go away - like:

typedef const Action& ActionAtScopeEnd;
//...
ActionAtScopeEnd action( mkAction( functor( receiver,
&Receiver::function ) ) );
valueUsed( action );

//Scope ends - action happens automatically and compiler happy that
value was used.

Hmm.. couldn't you just:
ActionAtScopeEnd action( mkAction( functor( receiver,
&Receiver::function ) ) ); action;

action by itself without assignment, etc... is basically a non op, but it
should get rid of your unused variable warning.