Comments on: Anaphoric Macros http://www.wisdomandwonder.com/article/134/anaphoric-macros Science and Philosophy Mon, 06 Feb 2012 09:21:05 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Grant http://www.wisdomandwonder.com/article/134/anaphoric-macros/comment-page-1#comment-6830 Grant Sat, 05 Mar 2011 03:13:44 +0000 http://www.wisdomandwonder.com/article/134/anaphoric-macros#comment-6830 ZB: When I wrote this I still didn’t grok hygiene. I updated the post in response. Thank you for posting even after 3 years! :) ZB:

When I wrote this I still didn’t grok hygiene. I updated the post in response. Thank you for posting even after 3 years! :)

]]> By: Grant http://www.wisdomandwonder.com/article/134/anaphoric-macros/comment-page-1#comment-6828 Grant Sat, 05 Mar 2011 02:24:33 +0000 http://www.wisdomandwonder.com/article/134/anaphoric-macros#comment-6828 P: Indeed. Putting this in print through helped me find the point :). P:

Indeed. Putting this in print through helped me find the point :).

]]> By: Zb http://www.wisdomandwonder.com/article/134/anaphoric-macros/comment-page-1#comment-6821 Zb Fri, 04 Mar 2011 18:43:14 +0000 http://www.wisdomandwonder.com/article/134/anaphoric-macros#comment-6821 IF can also be written as a function taking thunks, but that would be silly. If you are concerned about variable capture then why don't you write an anaphoric if macro that takes the variable name to introduce as an argument? (define-syntax aif* (syntax-rules () ((_ it test con . alt) (let ((it test)) (if it con . alt))))) Also this post is 3 years old, why are we commenting on it IF can also be written as a function taking thunks, but that would be silly.

If you are concerned about variable capture then why don’t you write an anaphoric if macro that takes the variable name to introduce as an argument?

(define-syntax aif*
(syntax-rules ()
((_ it test con . alt)
(let ((it test))
(if it con . alt)))))

Also this post is 3 years old, why are we commenting on it

]]> By: P http://www.wisdomandwonder.com/article/134/anaphoric-macros/comment-page-1#comment-6820 P Fri, 04 Mar 2011 18:28:55 +0000 http://www.wisdomandwonder.com/article/134/anaphoric-macros#comment-6820 You're missing the point of macros entirely. They are useful for abstracting syntax. m-aif does so, f-aif doesn't. One is not better than the other - it depends on what you want to write and what you're willing to write. You’re missing the point of macros entirely. They are useful for abstracting syntax. m-aif does so, f-aif doesn’t. One is not better than the other – it depends on what you want to write and what you’re willing to write.

]]>