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From: "Warren W. Gay VE3WWG" <ve3wwg@cogeco.ca>
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Subject: Re: Clause "with and use"
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Date: Mon, 17 Nov 2003 11:42:45 -0500
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Date: 2003-11-17T11:42:45-05:00
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Dmitry A. Kazakov wrote:
> On Fri, 14 Nov 2003 09:51:33 -0500, "Warren W. Gay VE3WWG"
> <ve3wwg@cogeco.ca> wrote:
>>Dmitry A. Kazakov wrote:
>>>On Thu, 13 Nov 2003 12:51:51 -0500, "Warren W. Gay VE3WWG"
>>><ve3wwg@cogeco.ca> wrote:
...
>>I think we have to remember that USE is primarily a language
>>construct for convenience. It is strictly unnecessary for
>>writing a program successfully. It only saves the program
>>writer (and reader) from having to specify (or read) the entire
>>hierarchical name.
> 
> After all Ada itself is just for convenience. We can still use
> hexadecimal machine codes! (:-))

That's silly, but I see the smiley.

> Let me propose a design principle for all standard and semi-standard
> Ada libraries:
> 
> "Any program should remain compilable if all of them are "use"-d."
>  
> Scared? (:-))
> 
>>Misuse that convenience, and you'll experience problems.
>>Conclusion: there is nothing wrong with the language
>>feature, but only the application thereof. ;-)
> 
> There should be something wrong with the language, if the following is
> illegal:
> 
> with Ada.Io_Exceptions;
> package A is
>    End_Error : exception renames Ada.Io_Exceptions.End_Error;
> end A;
> 
> with Ada.Io_Exceptions;
> package B is
>    End_Error : exception renames Ada.Io_Exceptions.End_Error;
> end B;

This is more sillyness. When you USE both packages, you take
a hierarchical name space and flatten it. So what else would
you expect if there were clashes?

-- 
Warren W. Gay VE3WWG
http://home.cogeco.ca/~ve3wwg