103 lines
5.4 KiB
Ada
103 lines
5.4 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- 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 --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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with System.Finalization_Root;
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package Ada.Finalization.List_Controller is
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pragma Elaborate_Body;
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package SFR renames System.Finalization_Root;
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----------------------------
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-- Simple_List_Controller --
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----------------------------
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type Simple_List_Controller is new Ada.Finalization.Limited_Controlled
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with record
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F : SFR.Finalizable_Ptr;
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end record;
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-- Used by the compiler to carry a list of temporary objects that
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-- needs to be finalized after having being used. This list is
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-- embedded in a controlled type so that if an exception is raised
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-- while those temporaries are still in use, they will be reclaimed
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-- by the normal finalization mechanism.
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overriding procedure Finalize (Object : in out Simple_List_Controller);
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---------------------
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-- List_Controller --
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---------------------
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-- Management of a bidirectional linked heterogeneous list of
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-- dynamically Allocated objects. To simplify the management of the
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-- linked list, the First and Last elements are statically part of the
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-- original List controller:
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--
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-- +------------+
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-- | --|-->--
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-- +------------+
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-- |--<-- | record with ctrl components
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-- |------------| +----------+
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-- +--|-- L | | |
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-- | |------------| | |
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-- | |+--------+ | +--------+ |+--------+|
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-- +->|| prev | F|---<---|-- |----<---||-- ||--<--+
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-- ||--------| i| |--------| ||--------|| |
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-- || next | r|--->---| --|---->---|| --||--------+
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-- |+--------+ s| |--------| ||--------|| | |
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-- | t| | ctrl | || || | |
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-- | | : : |+--------+| | |
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-- | | : object : |rec | | |
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-- | | : : |controller| | |
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-- | | | | | | | v
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-- |+--------+ | +--------+ +----------+ | |
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-- || prev -|-L|--------------------->--------------------+ |
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-- ||--------| a| |
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-- || next | s|-------------------<-------------------------+
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-- |+--------+ t|
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-- | |
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-- +------------+
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type List_Controller is new Ada.Finalization.Limited_Controlled
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with record
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F : SFR.Finalizable_Ptr;
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First,
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Last : aliased SFR.Root_Controlled;
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end record;
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-- Controls the chains of dynamically allocated controlled
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-- objects makes sure that they get finalized upon exit from
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-- the access type that defined them
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overriding procedure Initialize (Object : in out List_Controller);
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overriding procedure Finalize (Object : in out List_Controller);
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end Ada.Finalization.List_Controller;
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