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NNTP-Posting-Date: Mon, 13 Dec 2010 09:09:32 -0600
From: Brian Drummond <brian_drummond@btconnect.com>
Newsgroups: comp.lang.ada
Subject: Re: Properties
Date: Mon, 13 Dec 2010 15:10:42 +0000
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Date: 2010-12-13T15:10:42+00:00
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On Fri, 3 Dec 2010 15:14:09 -0600, "Randy Brukardt" <randy@rrsoftware.com>
wrote:

>"Shark8" <onewingedshark@gmail.com> wrote in message 
>news:75475874-cd6c-4e75-8a2f-7675ecf0864a@f20g2000vbc.googlegroups.com...
>...
>>It is somewhat irritating that you cannot initialize element to
>>GUI_Base'Class directly.
...
>>instantiation error at a-convec.ads:321
>>"unconstrained element type in array declaration actual for
>>"Element_Type" must be a definite subtype"
>
>Right, but you are using the wrong container for this. Try the indefinite 
>containers (designed specifically for this purpose):
>
>Package GUI_Vector is New Ada.Containers.Indefinite_Vectors
>   ( Element_Type => GUI_Base'Class, Index_Type => Positive );
>
>This will work fine.

Excellent! 
But perhaps the error message could be improved to suggest this, e.g.

>>"unconstrained element type in array declaration actual for
>>"Element_Type" must be a definite subtype, or container must be indefinite"

- Brian