// C++ does encapsulation
class A
{
public:
	A() { index = 0; }                     // constructor
	int	getIndex() { return index; }   // accessor
	void	doIncrement() { index++; }     // manipulator
private:
	int	index;                         // hidden data
};

main()
{
	A a();

	a.doIncrement();
	int i = a.getIndex();
//	a.index = 0;	// ERROR: index isn't visible to non-A code!
}