1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT RUN-TIME COMPONENTS                         --
4--                                                                          --
5--                       S Y S T E M . P A C K _ 1 2                        --
6--                                                                          --
7--                                 S p e c                                  --
8--                                                                          --
9--          Copyright (C) 1992-2021, Free Software Foundation, Inc.         --
10--                                                                          --
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 3,  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.                                     --
17--                                                                          --
18-- As a special exception under Section 7 of GPL version 3, you are granted --
19-- additional permissions described in the GCC Runtime Library Exception,   --
20-- version 3.1, as published by the Free Software Foundation.               --
21--                                                                          --
22-- You should have received a copy of the GNU General Public License and    --
23-- a copy of the GCC Runtime Library Exception along with this program;     --
24-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
25-- <http://www.gnu.org/licenses/>.                                          --
26--                                                                          --
27-- GNAT was originally developed  by the GNAT team at  New York University. --
28-- Extensive contributions were provided by Ada Core Technologies Inc.      --
29--                                                                          --
30------------------------------------------------------------------------------
31
32--  Handling of packed arrays with Component_Size = 12
33
34package System.Pack_12 is
35   pragma Preelaborate;
36
37   Bits : constant := 12;
38
39   type Bits_12 is mod 2 ** Bits;
40   for Bits_12'Size use Bits;
41
42   --  In all subprograms below, Rev_SSO is set True if the array has the
43   --  non-default scalar storage order.
44
45   function Get_12
46     (Arr     : System.Address;
47      N       : Natural;
48      Rev_SSO : Boolean) return Bits_12 with Inline;
49   --  Arr is the address of the packed array, N is the zero-based
50   --  subscript. This element is extracted and returned.
51
52   procedure Set_12
53     (Arr     : System.Address;
54      N       : Natural;
55      E       : Bits_12;
56      Rev_SSO : Boolean) with Inline;
57   --  Arr is the address of the packed array, N is the zero-based
58   --  subscript. This element is set to the given value.
59
60   function GetU_12
61     (Arr     : System.Address;
62      N       : Natural;
63      Rev_SSO : Boolean) return Bits_12 with Inline;
64   --  Arr is the address of the packed array, N is the zero-based
65   --  subscript. This element is extracted and returned. This version
66   --  is used when Arr may represent an unaligned address.
67
68   procedure SetU_12
69     (Arr     : System.Address;
70      N       : Natural;
71      E       : Bits_12;
72      Rev_SSO : Boolean) with Inline;
73   --  Arr is the address of the packed array, N is the zero-based
74   --  subscript. This element is set to the given value. This version
75   --  is used when Arr may represent an unaligned address
76
77end System.Pack_12;
78