[Paraview-developers] vtkOSPRayRendererNode.cxx: error: ‘isnan’ was not declared

[Haocheng Liu]

On Wed, Oct 26, 2016 at 8:31 AM, David E DeMarle <dave.demarle at kitware.com>
wrote:

> Thanks Jean.
>
> Mind filing a issue report on VTK's gitlab to help me keep track of this?
>
> https://gitlab.kitware.com/vtk/vtk/issues
>
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 21 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-881-4909
>
> On Wed, Oct 26, 2016 at 7:50 AM, Favre Jean <jfavre at cscs.ch> wrote:
>
>> Hello developers
>>
>> I switched to a new machine with a newer compiler.
>>
>> g++ (Ubuntu 5.4.0) does not like
>>
>> vtkOSPRayRendererNode.cxx:124:36: error: ‘isnan’ was not declared in
>> this scope
>>
>> I corrected to the following line to make it compile cleanly:
>>
>> if (std::isnan(ospDepthBuffer[i]))
>>
>> This is both in ParaView master, and 5.2RC2
>>
> Hi all,

I encountered the  same isnan problem when working on CMB projects, and
here is my solution to solve the problem once for all:

```C++
#if defined (__GNUC__) && (__GNUC__ > 4) && (__cplusplus)
#  include <cmath>
using std::isnan;
#else
#  include <math.h>
#endif
```

It works fine on Ubuntu 14.04(with GCC4.8) and Ubuntu 16.04(with GCC
5.4.1). Mac and Windows are also happy with it.

Hope it helps.


>
>>
>
>> -----------------
>> Jean
>>
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-- 
Best regards
Haocheng
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