new

#include <list>


template <typename T>
class Vector
{
    T *elem;
    int sz;

  public:
    ~Vector() { delete[] elem; }
    Vector(int s);

    T& operator[](int s);
    const T &operator[](int s) const;
    int size();
};

template <typename T>
Vector<T>::Vector(int s) : elem{new T[s]}, sz{s} {}

template <typename T>
const T &Vector<T>::operator[](int s)
const{
    return elem[s];
}

int main() {
    Vector <int> one (20);
    Vector <double> two (20);
}