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------------------------------------------------------------------------------
-- --
-- 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 --
-- --
-- S p e c --
-- --
-- Copyright (C) 1992-2009, 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 3, 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. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
with System.Finalization_Root;
package Ada.Finalization.List_Controller is
pragma Elaborate_Body;
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.
overriding procedure Finalize (Object : in out Simple_List_Controller);
---------------------
-- List_Controller --
---------------------
-- Management of a bidirectional linked heterogeneous 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|
-- | |
-- +------------+
type List_Controller is new Ada.Finalization.Limited_Controlled
with record
F : SFR.Finalizable_Ptr;
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
-- the access type that defined them
overriding procedure Initialize (Object : in out List_Controller);
overriding procedure Finalize (Object : in out List_Controller);
end Ada.Finalization.List_Controller;
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