template<class T>
valarray<bool> operator||(const valarray<T>& lhs,
const valarray<T>& rhs);
template<class T>
valarray<bool> operator||(const valarray<T> lhs, const T& rhs);
template<class T>
valarray<bool> operator||(const T& lhs, const valarray<T>& rhs);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].