    inline T ror(const T& a, const unsigned int n=1) {
      return n?(T)((a>>n)|(a<<((sizeof(T)<<3) - n))):a;
    }
    inline T ror(const T& a, const unsigned int n=1) {
      return n?(T)((a>>n)|(a<<((sizeof(T)<<3) - n))):a;
    }