Ruby object model: A matter of life and death
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The document discusses the Ruby object model, emphasizing that everything in Ruby is an object, including classes and modules. It explores concepts such as instance variables, superclasses, and metaprogramming, highlighting the relationship between objects and their classes. The text also references presentations and resources for further understanding of Ruby's object-oriented features.
Ruby object model: A matter of life and death
- 2. Javier Lafora Working at ASPgems @eLafo elafosobrerailes.blogspot.com
- 3. In ruby everything is an object
- 9. RBasic RClass RObject MyClass flags klass object instance_variables super flags klass constants instance_variables methods
- 13. BasicObject *super *klass Object Module *super *super *klass *klass Musician *super *klass name=() name() Class *super *klass bruce IronMaiden *klass *super @name=”bruce” *klass
- 14. Every instance of RClass will be an instance of Class even Class itself
- 15. Unshamesly taken from Burkey Libbey's presentation “Ruby's Object Model: Metaprogramming and other Magic”
- 16. BasicObject *super *klass Object *super *klass Musician *super *klass name=() name() bruce IronMaiden *klass *super @name=”bruce” *klass
- 17. BasicObject *super *klass Object *super *klass to_s() Musician *super *klass bruce IronMaiden *klass *super @name=”bruce” *klass
- 26. bruce IronMaiden *klass *super #bruce *klass *klass *super flight_plane()
- 30. Class Methods
- 32. Musician Class *super *super *klass *klass #Musician *super *klass awesome_musicians()
- 33. FAIL
- 34. Object *super Module Class *klass *super *klass #Musician *super Musician *klass *super awesome_musicians() *klass IronMaiden Class *super *super *klass *klass
- 38. BasicObject #BasicObject *super *super *klass *klass Object #Object *super *super *klass *klass Class *super Musician #Musician *klass *super *super *klass *klass IronMaiden #IronMaiden *super *super *klass *klass
- 39. “The superclass of the eigenclass of an object is the object's class. The superclass of the eigenclass of a class is the eigenclass of the class's superclass.” Paolo Perrotta
- 43. IronMaiden *super *klass ICSinger *super *klass high_pitch_from_hell() #bruce *klass bruce *super *klass
- 46. Musician *super *klass ICHeavyMetal *super *klass IronMaiden devil_horns() *super *klass #bruce *klass *super ICSinger *super bruce *klass *klass high_pitch_from_hell()
- 50. ICHeavyMetal HeavyMetal *super *klass *klass *iv_tbl *iv_tbl *m_tbl *m_tbl iv_tbl m_tbl devil_horns()
- 54. Object #Object *super *super *klass *klass m_tbl m_tbl Musician #Musician *super *super *klass *klass m_tbl m_tbl ICHeavyMetal HeavyMetal #HeavyMetal *super *super *super *klass *klass *klass *m_tbl *m_tbl *m_tbl IronMaiden #IronMaiden *super *super *klass *klass *m_tbl *m_tbl
- 56. Object #Object Musician #Musician ICHeavyMetal HeavyMetal ICHeavyMetal:: HeavyMetal:: InstanceMethods InstanceMethods HeavyMetal:: ClassMethods ICHeavyMetal:: IronMaiden ClassMethods #IronMaiden
- 67. Metaprogramming with Ruby – Paolo Perrotta http://mwrc2008.confreaks.com/11farley.html http://www.rubyinside.com/a-look-into-rubys-object-model-3940.html http://rhg.rubyforge.org/ http://www.madebydna.com/all/code/2011/06/24/eigenclasses-demystified.html http://www.ruby-doc.org/docs/ProgrammingRuby/html/ext_ruby.html http://www.atalon.cz/rb-om/ruby-object-model/#sc-inheritance-sample
- 68. Thank you
Editor's Notes
- #7: Ruby C's VALUE type is interpreted as an integer, if it's (Fixnum, Symbol, true, false or nil), or a pointer, if it's a large value klass is always a large value
- #8: struct st_table is mostly a ruby hash
- #38: #define META_CLASS_OF_CLASS_CLASS_P(k) (METACLASS_OF(k) == (k)) #define METACLASS_OF(k) RBASIC(k)->klass