eieio: eieio-singleton

 
 12.3 ‘eieio-singleton’
 ======================
 
 This class is defined in the package ‘eieio-base’.
 
  -- Class: eieio-singleton
      Inheriting from the singleton class will guarantee that there will
      only ever be one instance of this class.  Multiple calls to
      ‘make-instance’ will always return the same object.