Comments on: C++ Coder’s Newbie Guide to Lisp-style OO

By: Art

Art — Fri, 17 Apr 2009 00:27:57 +0000

In the code parentheses are placed odd:



(let ((apple (make-instance 'fruit)

      (banana (make-instance 'fruit :color :yellow))))

  (format t "Apples are ~A and bananas are ~A, honey is sweet but not as sweet as you.~%"

            (color apple) (color banana)))

Should be:



(let ((apple (make-instance 'fruit))

      (banana (make-instance 'fruit :color :yellow)))

....

Thanks! Fixed.

By: Kevin’s Link Blog » CLOSer To Lisp

Kevin’s Link Blog » CLOSer To Lisp — Mon, 07 Apr 2008 10:45:03 +0000

[...] Newbie Guide To Lisp OO [...]

By: Brendan Baldwin Dot Com » Blog Archive » links for 2008-04-02

Brendan Baldwin Dot Com » Blog Archive » links for 2008-04-02 — Wed, 02 Apr 2008 15:33:04 +0000

[...] C++ Coder’s Newbie Guide to Lisp-style OO | Mikael Jansson Reference article on Lisp coding style from a traditional OO-style language perspective. (tags: lisp style programming) [...]

By: Mikael Jansson

Mikael Jansson — Wed, 02 Apr 2008 07:32:57 +0000

Giorgos: I’m glad you found it useful!

Thanks for comments and corrections, I’ll update the article with the new info.

By: Giorgos

Giorgos — Wed, 02 Apr 2008 07:23:21 +0000

Great article! Exactly the kind of thing a former C++ user and Lisp newbie like me needed. Thank you for taking the time to write this!

I think I have one or two corrections, though.
According to note 4 in chapter 16 of Practical Common Lisp:

“T the constant value and T the class have no particular relationship except they happen to have the same name. T the value is a direct instance of the class SYMBOL and only indirectly an instance of T the class.”

Also, if I understand correctly, you should call (defvar *obj* (make-object)) instead of (defvar *obj* (make-obj)) in the “Poor Man’s OO” section.