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The C# Language
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/* This is another indexer for FailSoftArray This index takes a double argument It then rounds that argument to the nearest integer index */ public int this[double idx] { // This is the get accessor get { int index; // Round to nearest int if( (idx - (int) idx) < 05) index = (int) idx; else index = (int) idx + 1; if(ok(index)) { ErrFlag = false; return a[index]; } else { ErrFlag = true; return 0; } } // This is the set accessor set { int index; // Round to nearest int if( (idx - (int) idx) < 05) index = (int) idx; else index = (int) idx + 1; 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 fail-soft array class FSDemo { static void Main() { FailSoftArray fs = new FailSoftArray(5); // Put some values in fs for(int i=0; i < fsLength; i++) fs[i] = i; // Now index with ints and doubles ConsoleWriteLine("fs[1]: " + fs[1]);
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10:
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Indexers and Properties
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ConsoleWriteLine("fs[2]: " + fs[2]); ConsoleWriteLine("fs[11]: " + fs[11]); ConsoleWriteLine("fs[16]: " + fs[16]); } }
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PART I
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This program produces the following output:
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fs[1]: 1 fs[2]: 2 fs[11]: 1 fs[16]: 2
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As the output shows, the double indexes are rounded to their nearest integer value Specifically, 11 is rounded to 1, and 16 is rounded to 2 Although overloading an indexer as shown in this program is valid, it is not common Most often, an indexer is overloaded to enable an object of a class to be used as an index, with the index computed in some special way
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Indexers Do Not Require an Underlying Array
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It is important to understand that there is no requirement that an indexer actually operate on an array It simply must provide functionality that appears array-like to the user of the indexer For example, the following program has an indexer that acts like a read-only array that contains the powers of 2 from 0 to 15 Notice, however, that no actual array exists Instead, the indexer simply computes the proper value for a given index
// 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; } }
Part I:
The C# Language
class UsePwrOfTwo { static void Main() { PwrOfTwo pwr = new PwrOfTwo(); ConsoleWrite("First 8 powers of 2: "); for(int i=0; i < 8; i++) ConsoleWrite(pwr[i] + " "); ConsoleWriteLine(); ConsoleWrite("Here are some errors: "); ConsoleWrite(pwr[-1] + " " + pwr[17]); ConsoleWriteLine(); } }
The output from the program is shown here:
First 8 powers of 2: 1 2 4 8 16 32 64 128 Here are some errors: -1 -1
Notice that the indexer for PwrOfTwo includes a get accessor, but no set accessor As explained, this means that the indexer is read-only Thus, a PwrOfTwo object can be used on the right side of an assignment statement, but not on the left For example, attempting to add this statement to the preceding program won t work:
pwr[0] = 11; // won't compile
This statement will cause a compilation error because no set accessor is defined for the indexer There are two important restrictions to using indexers First, because an indexer does not define a storage location, a value produced by an indexer cannot be passed as a ref or out parameter to a method Second, an indexer must be an instance member of its class; it cannot be declared static
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