// safeArray.cpp: index values are checked before access
// Uses overloaded subscript [] operator for both put and get

#include <iostream.h>
#include <process.h>        // for exit()
const int LIMIT = 10;       // array size

class SafeArray
{
    private:
       int arr[LIMIT];
    public:
       int& operator [](int n)  // "int" causes a compile error at (*)
                                // return by reference.
       {
            if( n< 0 || n>=LIMIT )
            { cout << "Index out of bounds"; exit(1); }
            return arr[n];
       }
};

void main()
{
    SafeArray sa;

    for(int j=0; j<LIMIT; j++)
       sa[j] = j*10;            // (*) Lvalure required

    for(int j=0; j<=LIMIT; j++)
       cout << "sa[" << j << "] = " << sa[j] << endl;
}