------------------------------------------------------------------------------ -- -- -- 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;