From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.4
X-Google-Thread: 103376,5af5c381381ac5a7
X-Google-NewGroupId: yes
X-Google-Attributes: gida07f3367d7,domainid0,public,usenet
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news1.google.com!news4.google.com!feeder2.cambriumusenet.nl!feed.tweaknews.nl!192.87.166.28.MISMATCH!tudelft.nl!txtfeed1.tudelft.nl!multikabel.net!newsfeed10.multikabel.net!feed.xsnews.nl!border-1.ams.xsnews.nl!news.netcologne.de!ramfeed1.netcologne.de!newsfeed.arcor.de!newsspool2.arcor-online.net!news.arcor.de.POSTED!not-for-mail
Date: Tue, 08 Jun 2010 13:35:18 +0200
From: Georg Bauhaus <rm.dash-bauhaus@futureapps.de>
User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US;
 rv:1.9.1.9) Gecko/20100317 Thunderbird/3.0.4
MIME-Version: 1.0
Newsgroups: comp.lang.ada
Subject: Re: Ada requires too much typing!
References: <htnk3r02s27@drn.newsguy.com>
 <op.vdvcs3b5z25lew@macpro-eth1.krischik.com> <hujdso025n5@drn.newsguy.com>
 <op.vdyx98iuz25lew@macpro-eth1.krischik.com>
 <876j8vF54kU1@mid.individual.net>
In-Reply-To: <876j8vF54kU1@mid.individual.net>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Message-ID: <4c0e2af7$0$7659$9b4e6d93@newsspool1.arcor-online.net>
Organization: Arcor
NNTP-Posting-Date: 08 Jun 2010 13:35:19 CEST
NNTP-Posting-Host: c386cff6.newsspool1.arcor-online.net
X-Trace: 
 DXC=P71EcJTTE6lUoRk[hk2Walic==]BZ:afn4Fo<]lROoRa<`=YMgDjhgbkkVBCm`oO1jnc\616M64>jLh>_cHTX3jm1\`KR1]mT^h
X-Complaints-To: usenet-abuse@arcor.de
Xref: g2news1.google.com comp.lang.ada:11474
Date: 2010-06-08T13:35:19+02:00
List-Id: <comp.lang.ada>

On 08.06.10 12:10, Niklas Holsti wrote:
> Martin Krischik wrote:
> 
>> just about as painful as using local packages to add static variables
>> to Ada procedures.
> 
> Later Martin Krischik wrote:
> 
>> function f returns Integer
>>
>>   package i is
>>     g : Integer := 0;
>>   end i;
>>
>> begin
>>   i.g := i.g + 1;
>>   return i.g;
>> end f;
> 
> If you mean the latter code to be an example of the former task (add
> static variable), I believe you are mistaken.

I thought, too, that a new variable decl inside the local package
would still be elaborated each time. The initilization of g
confirms when tested.

But then I thought, surprise!, doubted everything I thought
I had learned about Ada. Looking at this:

with Ada.Text_IO;  use Ada.Text_IO;

procedure Sttc is

   type T is range 0 .. 10;

   procedure A is
      package P is  -- local package
         V: T;    -- presumably static?
      end P;
   begin
      if P.V'Valid then
         P.V := P.V + 1;
      else
         P.V := T'First;
      end if;
      Put_Line (T'Image(P.V));
   end A;

begin
   A; A; A;
end Sttc;


$ ./sttc
 0
 1
 2
 3
$

Compiled with or without -gnatVa.  But this seems to be accidental,
V is just a variable that isn't initialized, living on the stack.
Confirmation:

with Ada.Text_IO;  use Ada.Text_IO;

procedure Sttc is

   type T is range 0 .. 10;

   procedure A is
      package P is
         V: T;
      end P;
   begin
      if P.V'Valid then
         P.V := P.V + 1;
      else
         P.V := T'First;
      end if;
      Put_Line (T'Image(P.V));
   end A;

   procedure Ovrwrt_Stk  is
      X : T;
   begin
      X := T'First;
   end Ovrwrt_Stk;

begin
   A; Ovrwrt_Stk; A; Ovrwrt_Stk; A; Ovrwrt_Stk; A;
end Sttc;

$ ./sttc
 0
 1
 1
 1
$

Phew. Back to normal.