File : a-filico.ads
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-- --
-- GNAT COMPILER COMPONENTS --
-- --
5 -- 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 $ --
10 -- --
-- 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- --
15 -- 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 --
20 -- 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 --
25 -- 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. --
30 -- --
-- 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). --
-- --
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35
with System.Finalization_Root;
package Ada.Finalization.List_Controller is
pragma Elaborate_Body (List_Controller);
40 package SFR renames System.Finalization_Root;
----------------------------
-- Simple_List_Controller --
----------------------------
45
type Simple_List_Controller is new Ada.Finalization.Limited_Controlled
with record
F : SFR.Finalizable_Ptr;
end record;
50 -- 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.
55
procedure Finalize (Object : in out Simple_List_Controller);
---------------------
-- List_Controller --
60 ---------------------
-- 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
65 -- original List controller:
--
-- +------------+
-- | --|-->--
-- +------------+
70 -- |--<-- | record with ctrl components
-- |------------| +----------+
-- +--|-- L | | |
-- | |------------| | |
-- | |+--------+ | +--------+ |+--------+|
75 -- +->|| prev | F|---<---|-- |----<---||-- ||--<--+
-- ||--------| i| |--------| ||--------|| |
-- || next | r|--->---| --|---->---|| --||--------+
-- |+--------+ s| |--------| ||--------|| | |
-- | t| | ctrl | || || | |
80 -- | | : : |+--------+| | |
-- | | : object : |rec | | |
-- | | : : |controller| | |
-- | | | | | | | v
-- |+--------+ | +--------+ +----------+ | |
85 -- || prev -|-L|--------------------->--------------------+ |
-- ||--------| a| |
-- || next | s|-------------------<-------------------------+
-- |+--------+ t|
-- | |
90 -- +------------+
type List_Controller is new Ada.Finalization.Limited_Controlled
with record
F : SFR.Finalizable_Ptr;
95 First,
Last : aliased SFR.Root_Controlled;
end record;
-- Controls the chains of dynamically allocated controlled
-- objects makes sure that they get finalized upon exit from
100 -- the access type that defined them
procedure Initialize (Object : in out List_Controller);
procedure Finalize (Object : in out List_Controller);
105 end Ada.Finalization.List_Controller;