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

[Johnson, Hans J]

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<mailto: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<mailto:jchris.fillionr at kitware.com>>
Date: Tue, 16 Aug 2011 13:12:51 -0400
To: Sean McBride <sean at rogue-research.com<mailto:sean at rogue-research.com>>
Cc: Hans Johnson <hans-johnson at uiowa.edu<mailto:hans-johnson at uiowa.edu>>, ITK <insight-developers at itk.org<mailto: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<mailto: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<mailto:sean at rogue-research.com>
Rogue Research                        www.rogue-research.com<http://www.rogue-research.com>
Mac Software Developer              Montréal, Québec, Canada
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