Forum: Ruby-core [ruby-trunk - Feature #7876][Open] Add method for accessing Class from within Singleton Class

Issue #7876 has been reported by wardrop (Tom Wardrop).

----------------------------------------
Feature #7876: Add method for accessing Class from within Singleton 
Class
https://bugs.ruby-lang.org/issues/7876

Author: wardrop (Tom Wardrop)
Status: Open
Priority: Normal
Assignee:
Category:
Target version:


=begin
I'm quite surprised I haven't run into this sooner, but I seem to have 
just discovered that there's no means by which you can access the outer 
Class object once inside the context of the Singleton Class. Take the 
following example; how would I get a reference to (({Test})) from within 
the singleton?

  class Test
    class << self
      # How do I get a reference to Test from here?
    end
  end

I assume the answer is that there is no reliable way, hence the reason 
for this request. Could we add a method to the singleton class that 
allows access to the "outer" class, e.g.

  class Test
    class << self
      self.outerclass
    end
  end

Thoughts?
=end

Issue #7876 has been updated by ko1 (Koichi Sasada).

Category set to core
Assignee set to matz (Yukihiro Matsumoto)
Target version set to next minor


----------------------------------------
Feature #7876: Add method for accessing Class from within Singleton 
Class
https://bugs.ruby-lang.org/issues/7876#change-36735

Author: wardrop (Tom Wardrop)
Status: Open
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: core
Target version: next minor


=begin
I'm quite surprised I haven't run into this sooner, but I seem to have 
just discovered that there's no means by which you can access the outer 
Class object once inside the context of the Singleton Class. Take the 
following example; how would I get a reference to (({Test})) from within 
the singleton?

  class Test
    class << self
      # How do I get a reference to Test from here?
    end
  end

I assume the answer is that there is no reliable way, hence the reason 
for this request. Could we add a method to the singleton class that 
allows access to the "outer" class, e.g.

  class Test
    class << self
      self.outerclass
    end
  end

Thoughts?
=end

Issue #7876 has been updated by duerst (Martin Dürst).


This should be possible with Module#ancestors. Maybe not totally slick, 
but possible.
----------------------------------------
Feature #7876: Add method for accessing Class from within Singleton 
Class
https://bugs.ruby-lang.org/issues/7876#change-36756

Author: wardrop (Tom Wardrop)
Status: Open
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: core
Target version: next minor


=begin
I'm quite surprised I haven't run into this sooner, but I seem to have 
just discovered that there's no means by which you can access the outer 
Class object once inside the context of the Singleton Class. Take the 
following example; how would I get a reference to (({Test})) from within 
the singleton?

  class Test
    class << self
      # How do I get a reference to Test from here?
    end
  end

I assume the answer is that there is no reliable way, hence the reason 
for this request. Could we add a method to the singleton class that 
allows access to the "outer" class, e.g.

  class Test
    class << self
      self.outerclass
    end
  end

Thoughts?
=end

@duerst can you demonstrate how to do it with Module#ancestors ?