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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Charles container library usage examples
Date: Sat, 03 Sep 2005 10:45:09 +0100
Organization: Pushface
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Date: 2005-09-03T10:45:09+01:00
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Matthew Heaney <matthewjheaney@earthlink.net> writes:

> David Trudgett <wpower@zeta.org.au.nospamplease>  writes:

>> The first thing I had in mind to do was to create a simple map, for
>> example, to translate the following Common Lisp:
>> 
>> (defvar *side-corners*
>>   '((2 (1 3))
>>     (4 (1 7))
>>     (6 (3 9))
>>     (8 (7 9))))
>
> You can use a map, instantiated with type Integer as the key and an
> instantiation of a list as the element.  Either the hashed map or the
> ordered map would suffice.

I would have used (for example)

  type Axis is (X, Y);
  type Coordinate is range 1 .. 8;
  type Position is array (Axis) of Coordinate;

as the element type (making some assumptions about the problem!). No
need to have a list as the element if the problem doesn't call for it
(though good to be able to if needed, of course).