In your example, you're not overriding the sealed method (since it is sealed
:)). You're defining a new method on the subclass. You can do this in C# too:
class NewSquere : Square {
public new int GetNumberOfSizes() {
return 99;
}
}
As the "new" keyword suggest this method doesn't share the v-table slot with
the base class method - it has its own new slot. Hence no virtual call on
NewSquare instance strongly typed to Shape or Square will call your method.
Tomas
From: [email protected]
[mailto:[email protected]] On Behalf Of Mark Ryall
Sent: Saturday, June 13, 2009 1:37 AM
To: [email protected]
Subject: Re: [Ironruby-core] Sealed method can be overriden
You'll be able to override anything in ruby - you'll find CLR classes harder to
fool.
Try creating a C# method that accepts a Shape and calls the GetNumberOfSizes()
method - I expect you'll find that the NewSquare override is ignored and the
Square method is called instead.
I was surprised to find that a non virtual property in a C# class was able to
be replaced by defining a new one in ruby (this was not the case for a non
virtual method) - see
http://github.com/markryall/orangutan/blob/412913de26b9d545ebf08b2a1367e6675f8625f7/spikes/experiment1.rb
Mark.
On Sat, Jun 13, 2009 at 6:22 PM, Shay Friedman
<[email protected]<mailto:[email protected]>> wrote:
Hi guys,
I'm trying to override a sealed method in IR and I succeed.
For example:
C#:
public class Shape
{
public virtual int GetNumberOfSizes() { return 0; }
}
public class Square : Shape
{
public override sealed int GetNumberOfSizes() { return 4; }
}
IR:
class NewSquare < Square
def get_number_of_sizes
return 99
end
end
puts NewSquare.new.get_number_of_sizes # => 99
Bug or by design?
Thanks,
Shay.
----------------------------
Shay Friedman
http://www.ironshay.com
Follow me: http://twitter.com/ironshay
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