[Insight-developers] VNL Warning: Is there an equivalent to itkNotUsed?

[Jean-Christophe Fillion-Robin]

I guess doing the following would work ..

  inline T get (unsigned r, unsigned c) const {
    #ifdef NDEBUG
        assert(r == c); assert (r<size()); return diagonal_[r];
    #else
      (void)c;
      (void)r;
    #endif
  }



On Tue, Aug 16, 2011 at 1:25 PM, Johnson, Hans J <hans-johnson at uiowa.edu>wrote:

>   That does not solve the problem.  The declaration in the function
> prototype would need to be if/def'ed
>
>  #ifndef NDEBUG
>   #define vxlNotUsed(x)
> #else
>    #define vxlNotUsed(x) x
> #endif
>
>  void RequireZeroFunction( const int vxlNotUsed(
> possibleNotUsedVariableName) )
> {
>   assert( possibleNotUsedVariableName == 0 );
>   return;
> }
>
>  --
>
>   Hans J. Johnson, Ph.D.
> hans-johnson at uiowa.edu
> Assistant Professor of Psychiatry
> University of Iowa Carver College of Medicine
>  W278 GH, 200 Hawkins Drive
>  Iowa City, Iowa 52242
> Phone:  319-353-8587
>
>   From: Jean-Christophe Fillion-Robin <jchris.fillionr at kitware.com>
> Date: Tue, 16 Aug 2011 13:12:51 -0400
> To: Sean McBride <sean at rogue-research.com>
> Cc: Hans Johnson <hans-johnson at uiowa.edu>, ITK <insight-developers at itk.org
> >
> Subject: Re: [Insight-developers] VNL Warning: Is there an equivalent to
> itkNotUsed?
>
>  What about something like that:
>
> #ifndef NDEBUG
>   assert(...)
> #endif
>
> Jc
>
> On Tue, Aug 16, 2011 at 11:58 AM, Sean McBride <sean at rogue-research.com>wrote:
>
>> On Tue, 16 Aug 2011 15:54:33 +0000, Johnson, Hans J said:
>>
>> >I am trying to silence warnings from ITK for external tools.  I've
>> >noticed this warning that should be quite easy to silence, but I don't
>> >know the "vxl" compliant way to do it.
>> >
>> >Modules/ThirdParty/VNL/src/vxl/core/vnl/vnl_diag_matrix.h
>> >
>> >  //: get element with boundary checks.
>> >  inline T get (unsigned r, unsigned c) const {
>> >    assert(r == c); assert (r<size()); return diagonal_[r];
>> >  }
>> >
>> >/scratch/johnsonhj/src/Slicer/Applications/CLI/DiffusionApplications/
>> >ResampleDTI/ResampleDTI.cxx:1144:   instantiated from here
>> >/scratch/johnsonhj/src/Slicer-git-itkv4/ITKv4/Modules/ThirdParty/VNL/src/
>> >vxl/core/vnl/vnl_diag_matrix.h:106: warning: unused parameter ‘c’ [-
>> >Wunused-parameter]
>> >
>> >Any recommendations on how to silence this?
>>
>>  In my experience, the most portable way to silence that warning is to
>> cast the expression to void, that is:
>>
>> (void)c;
>>
>> This works in C, C++, Objective-C, with gcc, icc, Visual Studio, clang,
>> and CodeWarrior.
>>
>> Some people do this:
>>
>> c = c;
>>
>> But please don't, because clang will warn about an operation that does
>> nothing. :)
>>
>> --
>> ____________________________________________________________
>> Sean McBride, B. Eng                 sean at rogue-research.com
>> Rogue Research                        www.rogue-research.com
>> Mac Software Developer              Montréal, Québec, Canada
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>
>
>
> --
> +1 919 869 8849
>
>
>
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