| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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) 1992-1997, 2004 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. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| with System.Finalization_Root; |
| package Ada.Finalization.List_Controller is |
| pragma Elaborate_Body (List_Controller); |
| |
| 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 -- |
| --------------------- |
| |
| -- 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| |
| -- | | |
| -- +------------+ |
| |
| 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 |
| |
| procedure Initialize (Object : in out List_Controller); |
| procedure Finalize (Object : in out List_Controller); |
| |
| end Ada.Finalization.List_Controller; |