1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- S Y S T E M . F I N A L I Z A T I O N _ R O O T --
9 -- Copyright (C) 1992-2006, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
34 -- This unit provides the basic support for controlled (finalizable) types
37 with Unchecked_Conversion;
39 package System.Finalization_Root is
44 type Finalizable_Ptr is access all Root_Controlled'Class;
46 function To_Finalizable_Ptr is
47 new Unchecked_Conversion (Address, Finalizable_Ptr);
50 new Unchecked_Conversion (Finalizable_Ptr, Address);
52 type Empty_Root_Controlled is abstract tagged null record;
53 -- Just for the sake of Controlled equality (see Ada.Finalization)
55 type Root_Controlled is new Empty_Root_Controlled with record
56 Prev, Next : Finalizable_Ptr;
58 subtype Finalizable is Root_Controlled'Class;
60 procedure Initialize (Object : in out Root_Controlled);
61 procedure Finalize (Object : in out Root_Controlled);
62 procedure Adjust (Object : in out Root_Controlled);
65 (Stream : not null access Ada.Streams.Root_Stream_Type'Class;
66 Item : Root_Controlled);
69 (Stream : not null access Ada.Streams.Root_Stream_Type'Class;
70 Item : out Root_Controlled);
72 for Root_Controlled'Read use Read;
73 for Root_Controlled'Write use Write;
74 end System.Finalization_Root;