[dkf] has been doing [OO], too - here [http://www.man.ac.uk/~zzcgudf/tcl/oo2.tcl] is his pure-Tcl approach with the following features:
   * requires Tcl 8.5a2 or later ([dict] and many other features too)
   * about 16KB of size
   * prototype-based, but which has a class-based face built on top
   * in an earlier phase, presented at the 2004 Tcl convention (Powerpoint: [http://www.man.ac.uk/~zzcgudf/tcl/tcl2k4_presentation.pps] PDF: [http://www.man.ac.uk/~zzcgudf/tcl/tcl2k4_paper.pdf])

----
Here's the next version, '''oo3.tcl'''[http://www.man.ac.uk/~zzcgudf/tcl/oo3.tcl]

Current methods of the ''Object'' class/object:
   !:   Return the object's persistent state handle
   ?:   Convert a persistent state handle to a callable object
   addRef:   Increment the object's reference count
   as:   Bind object lifetime to the lifetime of a (presumably local) variable
   clone:   Produce a copy of the object, returning the name of the new object
   constructor:   Magic method called from '''new''' command
   delRef:   Decrement the object's reference count and delete if reaches zero
   delegate:   Arrange for a method (or all unknown methods if ''method'' is *) to be executed by another object (or object-like entity like a Tk widget)
   delete:   Delete the object, calling any destructor defined
   derive:   Create a new object through subclassing
   destructor:   Callback for when the object is '''delete'''d
   eq:   Is the argument object equal to this object?
   get:   Read an object field
   get parent:   Return the parent/superclass object, or empty string if no parent exists
   isa:   Test if the object is derived from another one
   linkArray:   Return the name of an array that is linked to the given dictionary-containing field
   linkVar:   Return the name of a variable that is linked to the given field
   methods:   Introspect and create object methods
   property:   Label the field as a property (bound to local variables when executing this object's methods)
   return:   Undo the linking set up with '''as''' and return the object
   set:   Write an object field
   unset:   Destroy an object field
Public helper procedures:
   super:   Call method using superclass's definition
   new:   Create a new object (based on the given "class" object) and call its constructor
The code has a self-test mode too, of course. This currently does some timing tests, and demonstrates the capabilities of the code in relation to error handling, variable linking and delegation.

Provided subclass-like objects are ''Collection'', ''List'', ''UniqueList'', and ''Map'' which together form a basic aggregate type framework.
----
[lv] is some background, alternative to the paper, or the paper or powerpoint or something available?

[DKF]: Not yet. :^)

Look at [Conference Slides] for pointers.









----
[Category Object Orientation]