Data Structures, Algorithms, & Applications in C++
Chapter 5, Exercise 15

The code is given below and in the file arrayListWithSet.h. Test code is included in arrayListWithSet.cpp. 
template<class T>
class arrayListWithSet : public arrayList<T> 
{
   public:
      // constructor and destructor
      arrayListWithSet(int initialCapacity = 10)
           : arrayList<T> (initialCapacity) {}

      void set(int theIndex, const T& theElement);
};

template<class T>
void arrayListWithSet<T>::set(int theIndex, const T& theElement)
{// Set element i to theElement.

   checkIndex(theIndex);
   element[theIndex] = theElement;
}