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-------------------------------------------------------------------------------
--- --
--- 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) 1992-2009, 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. --
--- --
-------------------------------------------------------------------------------
-
--- This unit provides the basic support for controlled (finalizable) types
-
-with Ada.Streams;
-with Ada.Unchecked_Conversion;
-
-package System.Finalization_Root is
- pragma Preelaborate;
-
- type Root_Controlled is tagged;
-
- type Finalizable_Ptr is access all Root_Controlled'Class;
-
- function To_Finalizable_Ptr is
- new Ada.Unchecked_Conversion (Address, Finalizable_Ptr);
-
- function To_Addr is
- new Ada.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);
-
- -- Stream-oriented attributes for Root_Controlled. These must be empty so
- -- as to not copy the finalization chain pointers. They are declared in
- -- a nested package so that they do not create primitive operations of
- -- Root_Controlled. Otherwise this would add unwanted primitives to (the
- -- full view of) Ada.Finalization.Limited_Controlled, which would cause
- -- trouble in cases where a limited controlled type is used as the
- -- designated type of a remote access-to-classwide type.
-
- package Stream_Attributes is
-
- procedure Write
- (Stream : not null access Ada.Streams.Root_Stream_Type'Class;
- Item : Root_Controlled) is null;
-
- procedure Read
- (Stream : not null access Ada.Streams.Root_Stream_Type'Class;
- Item : out Root_Controlled) is null;
-
- end Stream_Attributes;
-
- for Root_Controlled'Read use Stream_Attributes.Read;
- for Root_Controlled'Write use Stream_Attributes.Write;
-
-end System.Finalization_Root;