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From: mheaney@ni.net (Matthew Heaney)
Subject: Re: Array index ?
Date: 1998/01/29
Message-ID: <mheaney-ya023680002901982253280001@news.ni.net>#1/1
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Date: 1998-01-29T00:00:00+00:00
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In article <Pine.OSF.3.95.980129004337.31543A-100000@esus.cs.montana.edu>,
SiliconJesus <softichj@cs.montana.edu> wrote:

>I am trying to write some code that allows me to make an array of records
>and I want the array to have index for a string of 4,so Array(Sock) like a
>warehouse storage type program, I know this should be trivial to me, but
>I've been coding in C++ and Java for a semester and have forgotten some of
>my Ada roots, any help would be appreciated.

Do you mean you want an array whose index subtype is a subtype of String, as in

subtype T_Index is String (1 .. 4);

type T is array (T_Index) of R;

If so, you can't do that, because arrays can only have a discrete subtype
(integer or enumeration type) as the index subtype.  

You probably want a more abstract data structure, such as a dictionary
(sort of like a symbol table - consult you fave compiler book) or a
trie-structure (not a misspell) or a hash table, etc.

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Matthew Heaney
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