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From: lutz@iks-jena.de (Lutz Donnerhacke)
Newsgroups: comp.lang.ada
Subject: Re: Multidimensional array vs. array of array
Date: Mon, 17 Dec 2001 15:56:28 +0000 (UTC)
Organization: IKS GmbH Jena
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* Mark Lundquist wrote:
>"Lutz Donnerhacke" <lutz@iks-jena.de> wrote in message
>> How does a skilled Ada programmer define a return type containing a
>> multidimensional array? Of course, the simple solution works:
>>
>>   type Equations is array (Rows range <>, Columns range <>) of Number;
>>   type Workspace (row : Rows; col : Columns) is record
>>     eqs : Equations (Rows'First .. row, Columns'First .. col);
>>     ... some more stuff ...
>>   end record;
>>   function Init_Workspace return Workspace;
>>
>> But this approach fails miserably on extracting a single row from the
>> result as well as on construction the result in a recursive function.
>
>Would it help you to just define a distinct type to represent a row in
>isolation, but keep your matrix as defined above (i.e. not in terms of
>composition of the row type)?

After returning the Workspace in order to define a unconstrained variables,
it is possible.