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List:       mono-bugs
Subject:    [Mono-bugs] [Bug 33089][Nor] New - mcs complains when an indexer with different signature is declare
From:       bugzilla-daemon () rocky ! ximian ! com
Date:       2002-10-31 6:57:49
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Changed by mathpup@mylinuxisp.com.

http://bugzilla.ximian.com/show_bug.cgi?id=33089

--- shadow/33089	Thu Oct 31 01:57:49 2002
+++ shadow/33089.tmp.29869	Thu Oct 31 01:57:49 2002
@@ -0,0 +1,86 @@
+Bug#: 33089
+Product: Mono/MCS
+Version: unspecified
+OS: 
+OS Details: SuSE Linux 8.0
+Status: NEW   
+Resolution: 
+Severity: 
+Priority: Normal
+Component: Misc
+AssignedTo: mono-bugs@ximian.com                            
+ReportedBy: mathpup@mylinuxisp.com               
+QAContact: mono-bugs@ximian.com
+TargetMilestone: ---
+URL: 
+Cc: 
+Summary: mcs complains when an indexer with different signature is declared in a \
derived class without "override" +
+Description of Problem:           
+           
+If I create a indexer in a base class with one signature and another indexer in a \
derived            +class, where the deriver class's indexer has a different \
signature, mcs complains that the           +second indexer hides the base indexer \
without using "override" or "new." See program           +below:          
+     
+using System;    
+    
+public class Base    
+{    
+	public virtual int this[ int x ]    
+	{    
+		get { return 5; }    
+		set { ; }    
+	}    
+}    
+    
+    
+public class Derived: Base    
+{    
+	public virtual int this[ int x, int y ]    
+	{    
+		get { return 6; }    
+		set { ; }    
+	}    
+}    
+    
+    
+public class Testing    
+{    
+	public static void Main()    
+	{    
+		Derived d = new Derived();    
+		    
+		Console.WriteLine(d[4]);    
+	}    
+}        
+     
+           
+           
+Steps to reproduce the problem:           
+1.   Compile the program above.      
+2.            
+3.            
+           
+Actual Results:           
+   
+mcs shows an error: " this.cs(16) warning CS0114: `Derived.Item' hides inherited  
+member `Base.this'.  To make the current member override that implementation, add  
+the override keyword, otherwise use the new keyword  
+this.cs(29) error CS0154: indexer can not be used in this context, because it lacks \
a   +`get' accessor"  
+   
+           
+Expected Results:           
+  
+No errors.           
+  
+  
+How often does this happen?            
+           
+Always   
+           
+Additional Information:           
+ 
+Changing "virtual" to "override" in the Derived.this[] indexer results in successful \
 +compilation, but I think that that behavior is incorrect and should actually cause \
an error.

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