Overloading the C++ indexing subscript operator [] in a manner that allows for responses to updates

Question

Consider the task of writing an indexable class which automatically synchronizes its state with some external data-store (e.g. a file). In order to do this the class would n

Answer 1

    #include "stdafx.h"
    #include 

    template
    class MyVector
    {
        T* _Elem; // a pointer to the elements
        int _Size;  // the size
    public:
        // constructor
        MyVector(int _size):_Size(_size), _Elem(new T[_size])
        {
            // Initialize the elemets
            for( int i=0; i< _size; ++i )
                _Elem[i] = 0.0;
        }
        // destructor to cleanup the mess
        ~MyVector(){ delete []_Elem; }
    public:
        // the size of MyVector
        int Size() const
        {
            return _Size;
        }
        // overload subscript operator
        T& operator[]( int i )
        {
            return _Elem[i];
        }
    };


    int _tmain(int argc, _TCHAR* argv[])
    {
        MyVector vec(10);
        vec[0] =10;
        vec[1] =20;
        vec[2] =30;
        vec[3] =40;
        vec[4] =50;

        std::cout<<"Print vector Element "<