Yes, it's the second guess, it is my only knowlege about genericity in
Lisp.
I wanted to know how to do in Racket ... :)
thanks for all answers,
Alejandro
2014-04-06 00:21, Daniel Prager escribió:
Hi Roman
I think, Alejandro wanted to add clauses in different places (generic
in one module, added method in another, for example).
Quite possibly, or perhaps not! ;-)
Alejandro gave an example of one declaration mechanism that he'd seen
in CL. Hard to tell whether that's optimal for his context, or if
that's what he's familiar with.
Dan
On Thu, Apr 3, 2014 at 8:43 PM, Roman Klochkov <kalimeh...@mail.ru>
wrote:
Or even simpler
(define (dup a)
(cond
[(string? a) (string-append a a)]
[(integer? a) (list a a)])
:-)
I think, Alejandro wanted to add clauses in different places (generic
in one module, added method in another, for example).
Thu,
I
3 Apr 2014 20:11:36 +1100 от Daniel Prager <daniel.a.pra...@gmail.com>:
Here's an out-of-the-box option, using Racket's pattern matching
[1] with the (? predicate) form:
(define/match (dup a)
[((? string?)) (string-append a a)]
[((? integer?)) (list a a)])
Dan
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Roman Klochkov
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Links:
------
[1]
http://docs.racket-lang.org/reference/match.html#%28form._%28%28lib._racket%2Fmatch..rkt%29._define%2Fmatch%29%29
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