/* The following code example is taken from the book * "C++ Templates - The Complete Guide" * by David Vandevoorde and Nicolai M. Josuttis, Addison-Wesley, 2002 * * (C) Copyright David Vandevoorde and Nicolai M. Josuttis 2002. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in all copies. * This software is provided "as is" without express or implied * warranty, and with no claim as to its suitability for any purpose. */// class for objects that represent scalarstemplate <typename T>class A_Scalar {  private:    T const& s;  // value of the scalar  public:    // constructor initializes value    A_Scalar (T const& v)     : s(v) {    }    // for index operations the scalar is the value of each element    T operator[] (size_t) const {        return s;    }    // scalars have zero as size    size_t size() const {        return 0;    };};