From: Kedar Mhaswade <lists@...>
Date: 2013-03-15T08:09:56+09:00
Subject: Re: confusion with singleton method call

Love U Ruby wrote in post #1101669:
> What I know singleton methods can be called by the objects, on which it
> is defined. Now in the below example `C` is also
> an object of `Class` and singleton method `a_class_method` defined on
> the `Class` object `C`. So how does another `Class` object `D` able
> to call `a_class_method`? How does object `individuation` principle
> holds in this example?
>

>
> class C
> end
> #=> nil
> def C.a_class_method
> puts "Singleton method defined on #{self}"
> end
> #=> nil
> C.a_class_method
> #Singleton method defined on C
> #=> nil
> class D < C
> end
> #=> nil
> D.a_class_method
> #Singleton method defined on D
> #=> nil

If you did D.method :a_class_method you'll see:
 #<Method: D(C).a_class_method>

This happens because D's singleton class inherits from C's singleton 
class, which happens because D inherits from C (and as such, D _is_ C).

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