isnan() and isinf() checks

[Thiago Macieira]

Hasso Tepper wrote:
>The C99 standard says that isinf and isnan are macros,

C99 doesn't apply to KDE code because we're using C++98. So, ignore what 
it says.

However, just like the stdint.h and inttypes.h headers, we can test for 
the feature. If they are detected, we can use it.

-- 
  Thiago Macieira  -  thiago (AT) macieira.info - thiago (AT) kde.org
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