int isinf(double n) { if (IsNANorINF(n) && IsINF(n)) { return 1; } else { return 0; } }
inline bool _Stl_is_inf(double x) { return IsNANorINF(x) && IsINF(x); }
inline bool _Stl_is_nan_or_inf(double x) { return IsNANorINF(x); }