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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
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Newsgroups: comp.lang.ada
Subject: Re: What would you like in Ada202X?
Date: Thu, 26 Apr 2012 02:50:26 +0200
Organization: Ada @ Home
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Date: 2012-04-26T02:50:26+02:00
List-Id: <comp.lang.ada>

Le Thu, 26 Apr 2012 00:33:11 +0200, Jeffrey Carter  =

<spam.jrcarter.not@spam.not.acm.org> a =C3=A9crit:

> On 04/25/2012 02:30 PM, Yannick Duch=C3=AAne (Hibou57) wrote:
>>
>> And you have to modify and respecify the package each time you want t=
o  =

>> extend
>> it? The child package way is more modular.
>
> Ada emphasizes ease of reading over ease of writing (this is and alway=
s  =

> has been an explicit design goal stated at the beginning of the ARM); =
 =

> programming by extension (and your comment) emphasizes ease of writing=
  =

> over ease of reading. This is why I've always objected to including  =

> programming-by-extension features in Ada.

Child package are not less readable, as all kind of modularity ease  =

understanding, be it either child packages or nested packages. However, =
 =

there is another less mentioned =E2=80=94 while as much important =E2=80=
=94 requirement of  =

Ada, which is project and source management (thus the =E2=80=9Cis separa=
te=E2=80=9D). And  =

child packages ease project management, for the reason I gave. Also, chi=
ld  =

packages allows for optional additions or various alternatives for a giv=
en  =

addition, by means of project configuration: just remove the path to a s=
et  =

of child packages source and specs, to remove it from a project. With  =

nested package, you have to modify the package each time.

Getting ride of child packages (as back to Ada 83), would promise  =

nightmares for many ones.

-- =

=E2=80=9CSyntactic sugar causes cancer of the semi-colons.=E2=80=9D [1]
=E2=80=9CStructured Programming supports the law of the excluded muddle.=
=E2=80=9D [1]
[1]: Epigrams on Programming =E2=80=94 Alan J. =E2=80=94 P. Yale Univers=
ity