Package: Ada.Finalization.List_Controller

Dependencies

with System.Finalization_Root;

Description

GNAT COMPILER COMPONENTS

A D A . F I N A L I Z A T I O N . L I S T _ C O N T R O L L E R

B o d y

$Revision: 1.7 $

Copyright (C) 1992-1997 Free Software Foundation, Inc.

GNAT is free software; you can redistribute it and/or modify it under terms of the GNU General Public License as published by the Free Soft- ware Foundation; either version 2, or (at your option) any later ver- sion. GNAT is distributed in the hope that it will be useful, but WITH- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License distributed with GNAT; see file COPYING. If not, write to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

As a special exception, if other files instantiate generics from this unit, or you link this unit with other files to produce an executable, this unit does not by itself cause the resulting executable to be covered by the GNU General Public License. This exception does not however invalidate any other reasons why the executable file might be covered by the GNU Public License.

GNAT was originally developed by the GNAT team at New York University. It is now maintained by Ada Core Technologies Inc (http://www.gnat.com).

Header

package Ada.Finalization.List_Controller is

 
pragma Elaborate_Body (List_Controller);

Type Summary

List_Controller derived from Limited_Controlled
Overridden Operations:  Finalize, Initialize
Simple_List_Controller derived from Limited_Controlled
Overridden Operations:  Finalize
Inherited Operations:  Initialize

Other Items:

package SFR renames System.Finalization_Root;
Simple_List_Controller 
type Simple_List_Controller is new Ada.Finalization.Limited_Controlled
  with record
     F : SFR.Finalizable_Ptr;
  end record;
Used by the compiler to carry a list of temporary objects that needs to be finalized after having being used. This list is embedded in a controlled type so that if an exception is raised while those temporaries are still in use, they will be reclaimed by the normal finalization mechanism. 
procedure Finalize (Object : in out Simple_List_Controller);
List_Controller 
type List_Controller is new Ada.Finalization.Limited_Controlled
  with record
     F    :  SFR.Finalizable_Ptr;
     First,
     Last : aliased SFR.Root_Controlled;
  end record;
Management of a bidirectional linked heterogenous list of dynamically Allocated objects. To simplify the management of the linked list, the First and Last elements are statically part of the original List controller:

+------------+ | --|-->-- +------------+ |--<-- | record with ctrl components |------------| +----------+ +--|-- L | | | | |------------| | | | |+--------+ | +--------+ |+--------+| +->|| prev | F|---<---|-- |----<---||-- ||--<--+ ||--------| i| |--------| ||--------|| | || next | r|--->---| --|---->---|| --||--------+ |+--------+ s| |--------| ||--------|| | | | t| | ctrl | || || | | | | : : |+--------+| | | | | : object : |rec | | | | | : : |controller| | | | | | | | | | v |+--------+ | +--------+ +----------+ | | || prev -|-L|--------------------->--------------------+ | ||--------| a| | || next | s|-------------------<-------------------------+ |+--------+ t| | | +------------+

Controls the chains of dynamically allocated controlled objects makes sure that they get finalized upon exit from the access type that defined them 
procedure Initialize (Object : in out List_Controller);
procedure Finalize   (Object : in out List_Controller);
end Ada.Finalization.List_Controller;
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