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-
-@code{(require 'object)}
-@ftindex object
-
-This is the Macroless Object System written by Wade Humeniuk
-(whumeniu@@datap.ca).  Conceptual Tributes: @ref{Yasos}, MacScheme's
-%object, CLOS, Lack of R4RS macros.
-
-@subsection Concepts
-@table @asis
-
-@item OBJECT
-An object is an ordered association-list (by @code{eq?}) of methods
-(procedures).  Methods can be added (@code{make-method!}), deleted
-(@code{unmake-method!}) and retrieved (@code{get-method}).  Objects may
-inherit methods from other objects.  The object binds to the environment
-it was created in, allowing closures to be used to hide private
-procedures and data.
-
-@item GENERIC-METHOD
-A generic-method associates (in terms of @code{eq?}) object's method.
-This allows scheme function style to be used for objects.  The calling
-scheme for using a generic method is @code{(generic-method object param1
-param2 ...)}.
-
-@item METHOD
-A method is a procedure that exists in the object.  To use a method
-get-method must be called to look-up the method.  Generic methods
-implement the get-method functionality.  Methods may be added to an
-object associated with any scheme obj in terms of eq?
-
-@item GENERIC-PREDICATE
-A generic method that returns a boolean value for any scheme obj.
-
-@item PREDICATE
-A object's method asscociated with a generic-predicate. Returns
-@code{#t}.
-@end table
-
-@subsection Procedures
-
-@defun make-object ancestor @dots{}
-Returns an object.  Current object implementation is a tagged vector.
-@var{ancestor}s are optional and must be objects in terms of object?.
-@var{ancestor}s methods are included in the object.  Multiple
-@var{ancestor}s might associate the same generic-method with a method.
-In this case the method of the @var{ancestor} first appearing in the
-list is the one returned by @code{get-method}.
-@end defun
-
-@defun object? obj
-Returns boolean value whether @var{obj} was created by make-object.
-@end defun
-
-@defun make-generic-method exception-procedure
-Returns a procedure which be associated with an object's methods.  If
-@var{exception-procedure} is specified then it is used to process
-non-objects.
-@end defun
-
-@defun make-generic-predicate
-Returns a boolean procedure for any scheme object.
-@end defun
-
-@defun make-method! object generic-method method
-Associates @var{method} to the @var{generic-method} in the object.  The
-@var{method} overrides any previous association with the
-@var{generic-method} within the object.  Using @code{unmake-method!}
-will restore the object's previous association with the
-@var{generic-method}.  @var{method} must be a procedure.
-@end defun
-
-@defun make-predicate! object generic-preciate
-Makes a predicate method associated with the @var{generic-predicate}.
-@end defun
-
-@defun unmake-method! object generic-method
-Removes an object's association with a @var{generic-method} .
-@end defun
-
-@defun get-method object generic-method
-Returns the object's method associated (if any) with the
-@var{generic-method}.  If no associated method exists an error is
-flagged.
-@end defun
-
-@subsection Examples
-
-@example
-(require 'object)
-@ftindex object
-
-(define instantiate (make-generic-method))
-
-(define (make-instance-object . ancestors)
-  (define self (apply make-object
-                      (map (lambda (obj) (instantiate obj)) ancestors)))
-  (make-method! self instantiate (lambda (self) self))
-  self)
-
-(define who (make-generic-method))
-(define imigrate! (make-generic-method))
-(define emigrate! (make-generic-method))
-(define describe (make-generic-method))
-(define name (make-generic-method))
-(define address (make-generic-method))
-(define members (make-generic-method))
-
-(define society
-  (let ()
-    (define self (make-instance-object))
-    (define population '())
-    (make-method! self imigrate!
-                  (lambda (new-person)
-                    (if (not (eq? new-person self))
-                        (set! population (cons new-person population)))))
-    (make-method! self emigrate!
-                  (lambda (person)
-                    (if (not (eq? person self))
-                        (set! population
-                              (comlist:remove-if (lambda (member)
-                                                   (eq? member person))
-                                                 population)))))
-    (make-method! self describe
-                  (lambda (self)
-                    (map (lambda (person) (describe person)) population)))
-    (make-method! self who
-                  (lambda (self) (map (lambda (person) (name person))
-                                      population)))
-    (make-method! self members (lambda (self) population))
-    self))
-
-(define (make-person %name %address)
-  (define self (make-instance-object society))
-  (make-method! self name (lambda (self) %name))
-  (make-method! self address (lambda (self) %address))
-  (make-method! self who (lambda (self) (name self)))
-  (make-method! self instantiate
-                (lambda (self)
-                  (make-person (string-append (name self) "-son-of")
-                               %address)))
-  (make-method! self describe
-                (lambda (self) (list (name self) (address self))))
-  (imigrate! self)
-  self)
-@end example
-
-@subsubsection Inverter Documentation
-Inheritance:
-@lisp
-        <inverter>::(<number> <description>)
-@end lisp
-Generic-methods
-@lisp
-        <inverter>::value      @result{} <number>::value
-        <inverter>::set-value! @result{} <number>::set-value!
-        <inverter>::describe   @result{} <description>::describe
-        <inverter>::help
-        <inverter>::invert
-        <inverter>::inverter?
-@end lisp
-
-@subsubsection Number Documention
-Inheritance
-@lisp
-        <number>::()
-@end lisp
-Slots
-@lisp
-        <number>::<x>
-@end lisp
-Generic Methods
-@lisp
-        <number>::value
-        <number>::set-value!
-@end lisp
-
-@subsubsection Inverter code
-@example
-(require 'object)
-@ftindex object
-
-(define value (make-generic-method (lambda (val) val)))
-(define set-value! (make-generic-method))
-(define invert (make-generic-method
-                (lambda (val)
-                  (if (number? val)
-                      (/ 1 val)
-                      (error "Method not supported:" val)))))
-(define noop (make-generic-method))
-(define inverter? (make-generic-predicate))
-(define describe (make-generic-method))
-(define help (make-generic-method))
-
-(define (make-number x)
-  (define self (make-object))
-  (make-method! self value (lambda (this) x))
-  (make-method! self set-value!
-                (lambda (this new-value) (set! x new-value)))
-  self)
-
-(define (make-description str)
-  (define self (make-object))
-  (make-method! self describe (lambda (this) str))
-  (make-method! self help (lambda (this) "Help not available"))
-  self)
-
-(define (make-inverter)
-  (let* ((self (make-object
-                (make-number 1)
-                (make-description "A number which can be inverted")))
-         (<value> (get-method self value)))
-    (make-method! self invert (lambda (self) (/ 1 (<value> self))))
-    (make-predicate! self inverter?)
-    (unmake-method! self help)
-    (make-method! self help
-                  (lambda (self)
-                    (display "Inverter Methods:") (newline)
-                    (display "  (value inverter) ==> n") (newline)))
-    self))
-
-;;;; Try it out
-
-(define invert! (make-generic-method))
-
-(define x (make-inverter))
-
-(make-method! x invert! (lambda (x) (set-value! x (/ 1 (value x)))))
-
-(value x)                       @result{} 1
-(set-value! x 33)               @result{} undefined
-(invert! x)                     @result{} undefined
-(value x)                       @result{} 1/33
-
-(unmake-method! x invert!)      @result{} undefined
-
-(invert! x)                     @error{}  ERROR: Method not supported: x
-@end example