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When to Use Macros

Name: Anonymous 2013-07-10 8:53

http://www.bookshelf.jp/texi/onlisp/onlisp_9.html#SEC61

(defmacro while (test &body body)

  `(do ()

       ((not ,test))

     ,@body))

There is no way to duplicate the behavior of this macro with a function.

It is true for shitty CL. But it is false for a Lisp that supports fexprs.

Name: Anonymous 2013-07-10 22:19

Haskell doesn't need shitty hacks like macros. Plus you can write it point-free for improved readability:

import Control.Monad

import Control.Monad.Instances

import Data.Function



while :: Monad m => m Bool -> m a -> m ()

while = fix$join.(.(>>=)).(.(.)).(.(.)).(.(join.)).(.(.((flip when.).))).(.(.(.(>>)))).(.(.flip(.))).flip(.)

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When to Use Macros

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Name: Anonymous 2013-07-10 8:53

Name: Anonymous 2013-07-10 22:19