template<class T>
valarray<bool> operator>(const valarray<T>& x,
const valarray<T>& y);
template<class T>
valarray<bool> operator>(const valarray<T> x, const T& y);
template<class T>
valarray<bool> operator>(const T& x, const valarray<T>& y);The first template operator returns an object of class valarray<bool>, each of whose elements I is x[I] > y[I].
The second template operator stores in element I x[I] > y. The third template operator stores in element I x >
y[I].