' 2. It does not show up in the ancestry Superclass = Class.new # Define a method that will be in the ancestry of the subclass Superclass.define_singleton_method(:abc) { 123 } # We inherit the abc method from the singleton class of Superclass Subclass = Class.new Superclass Subclass.abc # => 123 Subclass.method(:abc).owner # => # Superclass.singleton_class # => # # But it does not show up in the ancestry Subclass.ancestors # => [Subclass, Superclass, Object, Kernel, BasicObject] Subclass.singleton_class.ancestors # => [Class, Module, Object, Kernel, BasicObject] --bcaec554d5de30bf7704d6345719 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On Wed, Feb 20, 2013 at 3:54 PM, Xavier R. <lists@ruby-forum.com>= ; wrote:

--
Posted via http://= www.ruby-forum.com/.

As far as I know, there are only = two differences:

1. It can't be instantiated

Object.new.singleton_class.new

# ~> -:1:in `new': can't create instance of singleton class= (TypeError)

# ~> from -:1:in `<main>'

<= br>

2. It does not show up in the ance= stry

Superclass =3D Class.new

# Define a method that will be in the ancestry of the subcla= ss

Superclass.define_singleton_method(:abc) { 123 }

<= div># We inherit the abc method from the singleton class of Superclass

Subclass =3D Class.new Superclass

Subclass.abc =A0 =A0 =A0 = =A0 =A0 =A0 =A0 =A0# =3D> 123

Subclass.method(:abc).owner # =3D> #<Class:Superclass>

<= div>Superclass.singleton_class =A0# =3D> #<Class:Superclass>

# But it does not show up in the ancestry

Sub= class.ancestors =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 # =3D> [Subclass, Superc= lass, Object, Kernel, BasicObject]

Subclass.singleton_class.ancestors # =3D> [Class, Module, Object, K= ernel, BasicObject]

--bcaec554d5de30bf7704d6345719--