Re: Macro vs Function

[Herbert Euler]

> From: David Kastrup <address@hidden>
> To: "Herbert Euler" <address@hidden>
> CC: address@hidden
> Subject: Re: Macro vs Function
> Date: Wed, 12 Apr 2006 11:07:48 +0200
>
> The macro is executed at function definition time, the function
> at execution time.

Sorry I don't quite understand this.  Could you please explain it?
Thanks.  But the following two programs seem to be same:

   (defun g ()
     nil)

   ;; macro
   (defmacro m (a)
     (if a
         t
       nil))
   (m (g))

   ;; function
   (defun f (a)
     (if a
         t
       nil))
   (f '(g))

And, these two seem to be same as well:

   ;; macro
   (defmacro m (a)
     (if (eval a)
         t
       nil))
   (m (g))

   ;; function
   (defun f (a)
     (if (eval a)
         t
       nil))
   (f '(g))

Regards,
Guanpeng Xu

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