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From: Mario Amado Alves <maa@di.fct.unl.pt>
Subject: Finalization of package instance
Date: 2000/01/18
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How do I define the finalization of an instantiation of a generic package?

For example, generic package Datalink initializes a connection with a
database server; when the package instance dies, the connection must be
closed (cleanly) via the proper procedure call. How does one automatize
this? E.g.

  generic
    Database_Server_Address: String;
  package Datalink is
    ...
  end Datalink;

The body:

  package body Datalink is

    ...

  begin

    Connect(Database_Server_Address);

  finalize -- HERE, I WHICH THIS WAS POSSIBLE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    Disconnect(Database_Server_Address);

  end Datalink;

Then,

  procedure Main is
    package Main_Data_Server is
      new Datalink("some.address.net");
  begin
    ...
  end Main

Now, when Main has complete running the disconnection should have been done
automatically. Is there an idiom to accomplish this in Ada?

Thanks.

| |,| | | |RuaFranciscoTaborda24RcD 2815-249CharnecaCaparica 351+212976751
|M|A|R|I|O|                                                  mob 939354005
|A|M|A|D|O|DepartmentoDeInformaticaFCT/UNL 2825-114 Caparica 351+212958536
|A|L|V|E|S|                                                  fax 212948541
| | | | | |                 maa@di.fct.unl.pt                FCT 212948300



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