/*
C#: The Complete Reference
by Herbert Schildt
Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
// Add Length property to FailSoftArray.
using System;
class FailSoftArray {
int[] a; // reference to underlying array
int len; // length of array — underlies Length property
public bool errflag; // indicates outcome of last operation
// Construct array given its size.
public FailSoftArray(int size) {
a = new int[size];
len = size;
}
// Read-only Length property.
public int Length {
get {
return len;
}
}
// This is the indexer for FailSoftArray.
public int this[int index] {
// This is the get accessor.
get {
if(ok(index)) {
errflag = false;
return a[index];
} else {
errflag = true;
return 0;
}
}
// This is the set accessor
set {
if(ok(index)) {
a[index] = value;
errflag = false;
}
else errflag = true;
}
}
// Return true if index is within bounds.
private bool ok(int index) {
if(index >= 0 & index < Length) return true;
return false;
}
}
// Demonstrate the improved fail-soft array.
public class ImprovedFSDemo {
public static void Main() {
FailSoftArray fs = new FailSoftArray(5);
int x;
// can read Length
for(int i=0; i < fs.Length; i++)
fs[i] = i*10;
for(int i=0; i < fs.Length; i++) {
x = fs[i];
if(x != -1) Console.Write(x + " ");
}
Console.WriteLine();
// fs.Length = 10; // Error, illegal!
}
}
[/csharp]