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   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 -- S Y S T E M . A D D R E S S _ T O _ A C C E S S _ C O N V E R S I O N S  --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2005 Free Software Foundation, Inc.          --
  10 --                                                                          --
  11 -- This specification is derived from the Ada Reference Manual for use with --
  12 -- GNAT. The copyright notice above, and the license provisions that follow --
  13 -- apply solely to the  contents of the part following the private keyword. --
  14 --                                                                          --
  15 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  16 -- terms of the  GNU General Public License as published  by the Free Soft- --
  17 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  18 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  19 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  20 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  21 -- for  more details.  You should have  received  a copy of the GNU General --
  22 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  23 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  24 -- MA 02111-1307, USA.                                                      --
  25 --                                                                          --
  26 -- As a special exception,  if other files  instantiate  generics from this --
  27 -- unit, or you link  this unit with other files  to produce an executable, --
  28 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  29 -- covered  by the  GNU  General  Public  License.  This exception does not --
  30 -- however invalidate  any other reasons why  the executable file  might be --
  31 -- covered by the  GNU Public License.                                      --
  32 --                                                                          --
  33 -- GNAT was originally developed  by the GNAT team at  New York University. --
  34 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  35 --                                                                          --
  36 ------------------------------------------------------------------------------
  37
  38 generic
  39    type Object (<>) is limited private;
  40
  41 package System.Address_To_Access_Conversions is
  42 pragma Preelaborate (Address_To_Access_Conversions);
  43
  44 pragma Elaborate_Body;
  45 --  This pragma Elaborate_Body is there to ensure the requirement of what is
  46 --  at the moment a dummy null body. The reason this null body is there is
  47 --  that we used to have a real body, and it causes bootstrap problems with
  48 --  old compilers if we try to remove the corresponding file.
  49
  50    pragma Compile_Time_Warning
  51      (Object'Unconstrained_Array,
  52       "Object is unconstrained array type" & ASCII.LF &
  53       "To_Pointer results may not have bounds");
  54
  55    --  Capture constrained status, suppressing warnings, since this is
  56    --  an obsolescent feature to use Constrained in this way (RM J.4).
  57
  58    pragma Warnings (Off);
  59    Xyz : Boolean := Object'Constrained;
  60    pragma Warnings (On);
  61
  62    type Object_Pointer is access all Object;
  63    for Object_Pointer'Size use Standard'Address_Size;
  64
  65    function To_Pointer (Value : Address)        return Object_Pointer;
  66    function To_Address (Value : Object_Pointer) return Address;
  67
  68    pragma Import (Intrinsic, To_Pointer);
  69    pragma Import (Intrinsic, To_Address);
  70
  71 end System.Address_To_Access_Conversions;