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Re: Multiple implementations of low-level functions
From: |
Keith Wright |
Subject: |
Re: Multiple implementations of low-level functions |
Date: |
Fri, 31 Oct 2003 23:45:09 -0500 |
> From: "Michael J. Barillier" <address@hidden>
>
> I've been hacking on a system for which I would like to have multiple
> implementations of low-level functions, which would be called by
> higher-level code. (e.g. A test version with static data, v. a test
> version with data stored in a database, v. a production version
> running against an Oracle database and communicating with other
> processes.)
> ...
> Anyone care to weigh in on either method, or propose a sexier
> solution?
Why not just have a variable and assign it the value you want?
(set! compute
(case version
((test1) (lambda(n) 42))
((test2) (lambda(n) (+ 1 n)))
(else (lambda(n) (call-oracle "select answer from air"))) ))
--
-- Keith Wright <address@hidden>
Programmer in Chief, Free Computer Shop <http://www.free-comp-shop.com>
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