BornAgain

BA_CORE_API_ inline bool isnan(double x)
{
#ifdef _MSC_VER
        return _isnan(x);
#else
        return std::isnan(x);
#endif
    }

BA_CORE_API_ inline bool isinf(double x)
{
#ifdef _MSC_VER
        return !_finite(x);
#else
        return std::isinf(x);
#endif
    }

I'd expect the need for this be gone with C++11 ... who could test, please?