[Class] of all classes in [TclOO]. All classes are instances of this class (which is consequently an instance of itself!)

===
‣ [oo::object]
  ‣ [oo::class]
===

http://www.tcl.tk/man/tcl8.6/TclCmd/class.htm

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[AMG]: Is there a compelling reason why [[oo::class new]] is hidden?

[DKF]: Because everyone treats classes as named entities with long lifetimes. Expose it if you want.

[AMG]: How do I do this?  Sorry, I'm a total [TclOO] newb. :^)

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[AMG]: Can I define a destructor for a class?  Automatically deleting all subclasses, instances, and "mixees" is good, but I'm working on a project that needs some additional cleanup when a class is destroyed.

[DKF]: Yes. The simplest technique is to make your class an instance of a subclass of `oo::class` and attach the destructor to that.

======
oo::class create class-with-destructor {
    superclass oo::class
    destructor {
        puts "bye!"
    }
}

class-with-destructor create MyClass {
    # ...
}
======

But if you've already got your class instance, do not despair! You can either inject the destructor through a mixin or by modifying the class instance's superclass (both with [oo::objdefine]):

======
# Technique 1
oo::objdefine MyClass mixin class-with-destructor
# Technique 2
oo::objdefine MyClass class class-with-destructor
======

If you're changing objects' classes, remember that classes cannot be changed to non-classes or ''vice versa'', and both [oo::object] and `oo::class` cannot have their class changed (they're special, for the sake of sanity).

[AMG]: Wait a second, according to [http://www.tcl.tk/man/tcl8.6/TclCmd/define.htm#M8], "the destructor is called when objects of the class are deleted".  I want a destructor for when the class itself is deleted.

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See also:

   * [Semantics of the oo::class command]

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