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