[MC]: As I go about Learning [XOTcl], I decided to wikify some of my questions
as I find answers to them to help others in the future.  Feel free to add & expand on this page.

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Q: '''What's the equivalent idiom for what [snit] would call ''type variables'' (or static member variables)?'''

A: On the XOTcl mailing list I received helpful answers from [Neophytos Demetriou], [Kristoffer Lawson], and [Gustaf Neumann].  Summarizing here: 

 Class Chapters
 Chapters set current_chapter 12345

 # Then any object or class can use
 Chapters set current_chapter

 # while an instance could do:
 Chapters aChapter
 [aChapter info class] set current_chapter 4567
 puts [[aChapter info class] set current_chapter]

 # We can a printCurrentChapter method (an instproc on the Chapters class) as:
 Chapters instproc printCurrentChapter {} {
     puts [[my info class] set current_chapter]
 }

 # and we call the method
 aChapter printCurrentChapter

Another possibility is to bring the classes variable into the scope of
a method on an object.

 Chapters instproc incrChapter {} {
     [self class] instvar current_chapter
     incr current_chapter
 }

 aChapter incrChapter

Gustaf in particular pointed out that ''XOTcl does not need a special construct, since every class is an object as well, and variables kept in a class are nothing special.  Note that a programmer can decide which kind of class he is refering to:''

   * the class which is the type of the object (via ''my info class'')
   * the current class, which is currently active (via ''self class'')

''The type of variable you are refering to is the first one.''


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[Category Object Orientation]