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#include <iostream>
using namespace std;

const int SIZE = 3;

class MyClass {
  int a[SIZE];
public:
  MyClass() {
    register int i;
    for(i = 0; i <SIZE; i++) 
       a[i] = i;
  }
  int &operator[](int i) {
     return a[i];
  }
};

int main()
{
  MyClass myObject;

  cout << myObject[2];  
  cout << " ";

  myObject[2] = 25;     // [] on left of =

  cout << myObject[2];  // now displays 25

  return 0;
}

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2.	Define operator []
3.	Overload [].
4.	String class: Index characters and '=' operator
5.	Index operator for class

Return a reference from []. : Index « Overload « C++

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