| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- S Y S T E M . F I N A L I Z A T I O N _ R O O T -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- Copyright (C) 1992-2006, 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, 51 Franklin Street, Fifth Floor, -- |
| -- Boston, MA 02110-1301, 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. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- This unit provides the basic support for controlled (finalizable) types |
| |
| with Ada.Streams; |
| with Unchecked_Conversion; |
| |
| package System.Finalization_Root is |
| pragma Preelaborate; |
| |
| type Root_Controlled; |
| |
| type Finalizable_Ptr is access all Root_Controlled'Class; |
| |
| function To_Finalizable_Ptr is |
| new Unchecked_Conversion (Address, Finalizable_Ptr); |
| |
| function To_Addr is |
| new Unchecked_Conversion (Finalizable_Ptr, Address); |
| |
| type Empty_Root_Controlled is abstract tagged null record; |
| -- Just for the sake of Controlled equality (see Ada.Finalization) |
| |
| type Root_Controlled is new Empty_Root_Controlled with record |
| Prev, Next : Finalizable_Ptr; |
| end record; |
| subtype Finalizable is Root_Controlled'Class; |
| |
| procedure Initialize (Object : in out Root_Controlled); |
| procedure Finalize (Object : in out Root_Controlled); |
| procedure Adjust (Object : in out Root_Controlled); |
| |
| procedure Write |
| (Stream : not null access Ada.Streams.Root_Stream_Type'Class; |
| Item : Root_Controlled); |
| |
| procedure Read |
| (Stream : not null access Ada.Streams.Root_Stream_Type'Class; |
| Item : out Root_Controlled); |
| |
| for Root_Controlled'Read use Read; |
| for Root_Controlled'Write use Write; |
| end System.Finalization_Root; |
