From: Ryan Leavengood <mrcode@...>
Date: 2005-04-21T00:36:58+09:00
Subject: Re: [EVALUATION] - E03d - The Ruby Object Model (End Game)

Ilias Lazaridis wrote:
>
> And I know now:
>
> "ri class" documentation is missleading.
>
> and: it is false.

I'm probably going to be shot by the rest of the mailing list members for
continuing this, but I learned from this so hopefully others will as well:

irb(main):001:0> ObjectMetaClass = class<<Object;self;end
=> #<Class:Object>
irb(main):002:0> ObjectMetaClass.superclass
=> Class
irb(main):003:0> ClassMetaClass = class<<Class;self;end
=> #<Class:Class>
irb(main):004:0> ClassMetaClass.superclass
=> #<Class:Module>
irb(main):005:0> ClassMetaClass.superclass.superclass
=> #<Class:Object>
irb(main):006:0> ClassMetaClass.superclass.superclass.superclass
=> Class
irb(main):007:0> ObjectMetaClass.class
=> Class
irb(main):008:0> ClassMetaClass.class
=> Class
irb(main):009:0> ModuleMetaClass = class<<Module;self;end
=> #<Class:Module>
irb(main):010:0> ModuleMetaClass.superclass
=> #<Class:Object>
irb(main):011:0> ModuleMetaClass.superclass.superclass
=> Class
irb(main):012:0> ModuleMetaClass.class
=> Class
irb(main):013:0> StringMetaClass = class<<String;self;end
=> #<Class:String>
irb(main):014:0> StringMetaClass.superclass
=> #<Class:Object>
irb(main):015:0> StringMetaClass.superclass.superclass
=> Class
irb(main):016:0> StringMetaClass.class
=> Class
irb(main):017:0> class Object;def metaclass;class<<self;self;end;end;end
=> nil
irb(main):018:0> Object.metaclass
=> #<Class:Object>
irb(main):019:0> Class.metaclass
=> #<Class:Class>

I feel this proves the diagram shown in "ri Class" is correct. Not that
*I* ever had any doubt.

Ryan