Are there advantages/dis-advantages to implementing simple one-liners as macros? For instance
(define (even? n)
(zero? (% n 2)))
versus the macro definition.
--hsm[/code]
Do you think on something like:
(define-macro (evenm? n) (zero? (% (eval n) 2)))
I think macros should be used only if one cannot use functions. The functions are slightly shorter, faster (in this case 20%) and probably easier to manipulate by meta-code. For example,
In this case, I think function is better choice.
Why easier to manipulate by meta-code? For example, I wrote
(define (evenf? n) (zero? (% n 2)))
(define-macro (evenm? n) (zero? (% (eval n) 2)))
(debug-wrap evenf?)
(debug-wrap evenm?)
(set 'x 44)
(evenf? x)
; Output:
;
; (evenf? (in 44)
; (out true)); t=0, mem=3, sym=0
;
(evenm? x)
; (evenm? (in x)
; (out true)); t=0, mem=3, sym=0
;
(exit)
Macro output is less useful because
I like your rule of "macros should be used only if one cannot use functions". I think that this is where programmers coming from other languages and more C/C++ style '
--hsm