#ifdef PLATFORM_WIN32
inline bool IsNaN(double d)        { return _isnan(d); }
#elif PLATFORM_OSX11
inline bool IsNaN(double d)        { return std::isnan(d); }
#else
inline bool IsNaN(double d)        { return isnan(d); }
#endif

inline bool IsNaN(double d)        { return d != d; }