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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Operation can be dispatching in only one type
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Date: Sun, 22 Nov 2009 18:41:02 +0100
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Date: 2009-11-22T18:41:01+01:00
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On Sun, 22 Nov 2009 08:52:05 -0800 (PST), xorque wrote:

> On Nov 22, 4:42�pm, "Dmitry A. Kazakov" <mail...@dmitry-kazakov.de>
> wrote:
>> On Sun, 22 Nov 2009 08:27:59 -0800 (PST), xorque wrote:
>>> Not sure which part of the code you're referring to here.
>>
>> The function Open_Archive returns a new object. In Main you call it and
>> then apply the function Stream to the result. Stream returns an access to
>> the component File of the temporal object created by Open_Archive. Then
>> this object is destroyed and a dangling pointer is assigned to S. When you
>> call Integer'Inpit on S, it accesses a garbage.
> 
> Ah, I see what you mean.
> 
> In the process of trying to save the result of Open_Archive so that I
> can test
> if this problem still occurs, I've run into another problem:
> 
>   A : Archiver.Archiver_t;
>   O : constant Archiver.Archive_t := Archiver.Archive_t
> (Archiver.Open_Archive (A, "file.zip"));
>   S : constant Stream_IO.Stream_Access := Archiver.Stream (O);
> 
> main.adb:9:46: illegal context for call to function with limited
> result
> 
> I have to admit to not understanding that error.

And I don't understand your design. If Archive is a Stream derive then it
from Root_Stream_Type. If it deals with a stream then pass
Root_Stream_Type'Class to the operations that need it.

But never ever return pointers to components without an urgent need.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de