// Overloading operators for Array class
#include <cstdlib>
#include <iostream>
using namespace std;
// A class to represent an integer array
class Array {
private:
int* ptr;
int size;
public:
Array(int*, int);
// Overloading [] operator to access elements in array style
const int operator[](int) const;
int& operator[](int);
// Utility function to print contents
void print() const;
};
// Implementation of [] operator. This function must return a
// reference as array element can be put on left side
int& Array::operator[](int index)
{
if (index >= size) {
cout << "Array index out of bound, exiting";
exit(0);
}
std::cout << "& Operator[] ptr[" << index << "] " << ptr[index]
<< " address " << &ptr[index] << std::endl;
return ptr[index];
}
const int Array::operator[](int index) const
{
if (index >= size) {
cout << "Array index out of bound, exiting";
exit(0);
}
std::cout << "Operator[]: ptr[" << index << "] " << ptr[index]
<< "address " << &ptr[index] << std::endl;
return ptr[index];
}
// constructor for array class
Array::Array(int* p = NULL, int s = 0)
{
size = s;
ptr = NULL;
if (s != 0) {
ptr = new int[s];
for (int i = 0; i < s; i++) {
ptr[i] = p[i];
}
}
}
void Array::print() const
{
for (int i = 0; i < size; i++)
cout << ptr[i] << " Addr: " << &ptr[i] << std::endl;
cout << endl;
}
// Driver program to test above methods
int main()
{
int a[] = { 1, 2, 4, 5 };
Array arr1(a, 4);
arr1.print();
/* The below line returns a copy */
std::cout << arr1[3] << std::endl;
arr1[2] = 6;
arr1.print();
arr1[8] = 6;
return 0;
}
