Indexers don't have to operate on actual arrays

/*
C#: The Complete Reference 
by Herbert Schildt 

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/

// Indexers don't have to operate on actual arrays. 
 
using System; 
 
class PwrOfTwo {  
 
  /* Access a logical array that contains 
     the powers of 2 from 0 to 15. */ 
  public int this[int index] { 
    // Compute and return power of 2. 
    get { 
      if((index >= 0) && (index < 16)) return pwr(index); 
      else return -1; 
    } 
 
    // there is no set accessor 
  } 
 
  int pwr(int p) { 
    int result = 1; 
 
    for(int i=0; i<p; i++) 
      result *= 2; 
     
    return result; 
  } 
}  
  
public class UsePwrOfTwo {  
  public static void Main() {  
    PwrOfTwo pwr = new PwrOfTwo(); 
 
    Console.Write("First 8 powers of 2: "); 
    for(int i=0; i < 8; i++) 
      Console.Write(pwr[i] + " "); 
    Console.WriteLine(); 
 
    Console.Write("Here are some errors: "); 
    Console.Write(pwr[-1] + " " + pwr[17]); 
 
    Console.WriteLine(); 
  } 
}

1.	indexed properties
2.	Indexer with complex logic
3.	Use an indexer to create a fail-soft array
4.	Overload the FailSoftArray indexer
5.	Two dimensional indexer
6.	A two-dimensional fail-soft array
7.	Create a specifiable range array class
8.	Define indexer
9.	Indexer: allow array like index
10.	illustrates the use of an indexer 1
11.	Implements an indexer in a class
12.	Illustrates the use of an indexer
13.	Implements an indexer and demonstrates that an indexer does not have to operate on an array
14.	C# Properties and Indexers
15.	Indexing with an Integer Index
16.	Indexing with an String Index
17.	Indexing with Multiple Parameters
18.	Return class object from indexer

Indexers don't have to operate on actual arrays : Indexer « Class Interface « C# / C Sharp

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