gcc/ada/s-finroo.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                S Y S T E M . F I N A L I Z A T I O N _ R O O T           --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --                                                                          --
  10 --   Copyright (C) 1992-2000 Free Software Foundation, Inc.                 --
  11 --                                                                          --
  12 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  20 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, USA.                                                      --
  22 --                                                                          --
  23 -- As a special exception,  if other files  instantiate  generics from this --
  24 -- unit, or you link  this unit with other files  to produce an executable, --
  25 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  26 -- covered  by the  GNU  General  Public  License.  This exception does not --
  27 -- however invalidate  any other reasons why  the executable file  might be --
  28 -- covered by the  GNU Public License.                                      --
  29 --                                                                          --
  30 -- GNAT was originally developed  by the GNAT team at  New York University. --
  31 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34 with Ada.Streams;
  35 package System.Finalization_Root is
  36 pragma Preelaborate (Finalization_Root);
  37
  38    type Root_Controlled;
  39
  40    type Finalizable_Ptr is access all Root_Controlled'Class;
  41
  42    type Empty_Root_Controlled is abstract tagged null record;
  43    --  Just for the sake of Controlled equality (see Ada.Finalization)
  44
  45    type Root_Controlled is new Empty_Root_Controlled with record
  46       Prev, Next : Finalizable_Ptr;
  47    end record;
  48    subtype Finalizable is Root_Controlled'Class;
  49
  50    procedure Initialize (Object : in out Root_Controlled);
  51    procedure Finalize   (Object : in out Root_Controlled);
  52    procedure Adjust     (Object : in out Root_Controlled);
  53
  54    procedure Write     (Stream : access Ada.Streams.Root_Stream_Type'Class;
  55                         Item : in Root_Controlled);
  56    procedure Read      (Stream : access Ada.Streams.Root_Stream_Type'Class;
  57                         Item : out Root_Controlled);
  58
  59    for Root_Controlled'Read use Read;
  60    for Root_Controlled'Write use Write;
  61 end System.Finalization_Root;