namespace std {
    template <class T>
    class indirect_array {
      public:
        typedef T value_type;

        void operator= (const T&);
        void operator= (const valarray<T>&) const;
        void operator*= (const valarray<T>&) const;
        void operator/= (const valarray<T>&) const;
        void operator%= (const valarray<T>&) const;
        void operator+= (const valarray<T>&) const;
        void operator-= (const valarray<T>&) const;
        void operator^= (const valarray<T>&) const;
        void operator&= (const valarray<T>&) const;
        void operator|= (const valarray<T>&) const;
        void operator<<= (const valarray<T>&) const;
        void operator>>= (const valarray<T>&) const;
        ~indirect_array();
      private:
        indirect_array();
        indirect_array(const indirect_array<T>&);
        indirect_array& operator= (const indirect_array<T>&);
        ...
    };
}