C# 0 The Complete Reference

PART I

C h a p t e r   1 0 :  

I n d e x e r s   a n d   P r o p e r t i e s  

267

PART IPART I

As the output verifies, objects of type 

RangeArray

 can be indexed in ways other than 

starting at zero. Let’s look more closely at how 

RangeArray

 is implemented.

RangeArray

 begins by defining the following private instance variables:

// Private data.

int[] a; // reference to underlying array

int lowerBound; // smallest index

int upperBound; // largest index

The underlying array is referred to by 

a

. This array is allocated by the 

RangeArray

constructor. The index of the lower bound of the array is stored in 

lowerBound

, and the 

index of the upper bound is stored in 

upperBound

.

Next, the auto-implemented, read-only properties