1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT RUN-TIME COMPONENTS                         --
4--                                                                          --
5--                           A D A . S T R E A M S                          --
6--                                                                          --
7--                                 S p e c                                  --
8--                                                                          --
9--          Copyright (C) 1992-2013, 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 3,  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.                                     --
21--                                                                          --
22-- As a special exception under Section 7 of GPL version 3, you are granted --
23-- additional permissions described in the GCC Runtime Library Exception,   --
24-- version 3.1, as published by the Free Software Foundation.               --
25--                                                                          --
26-- You should have received a copy of the GNU General Public License and    --
27-- a copy of the GCC Runtime Library Exception along with this program;     --
28-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
29-- <http://www.gnu.org/licenses/>.                                          --
30--                                                                          --
31-- GNAT was originally developed  by the GNAT team at  New York University. --
32-- Extensive contributions were provided by Ada Core Technologies Inc.      --
33--                                                                          --
34------------------------------------------------------------------------------
35
36package Ada.Streams is
37   pragma Pure;
38
39   type Root_Stream_Type is abstract tagged limited private;
40   pragma Preelaborable_Initialization (Root_Stream_Type);
41
42   type Stream_Element is mod 2 ** Standard'Storage_Unit;
43
44   type Stream_Element_Offset is range
45     -(2 ** (Standard'Address_Size - 1)) ..
46     +(2 ** (Standard'Address_Size - 1)) - 1;
47
48   subtype Stream_Element_Count is
49      Stream_Element_Offset range 0 .. Stream_Element_Offset'Last;
50
51   type Stream_Element_Array is
52      array (Stream_Element_Offset range <>) of aliased Stream_Element;
53
54   procedure Read
55     (Stream : in out Root_Stream_Type;
56      Item   : out Stream_Element_Array;
57      Last   : out Stream_Element_Offset)
58   is abstract;
59
60   procedure Write
61     (Stream : in out Root_Stream_Type;
62      Item   : Stream_Element_Array)
63   is abstract;
64
65private
66
67   type Root_Stream_Type is abstract tagged limited null record;
68
69   --  Stream attributes for Stream_Element_Array: trivially call the
70   --  corresponding stream primitive for the whole array, instead of doing
71   --  so element by element.
72
73   procedure Read_SEA
74     (S : access Root_Stream_Type'Class;
75      V : out Stream_Element_Array);
76
77   procedure Write_SEA
78     (S : access Root_Stream_Type'Class;
79      V : Stream_Element_Array);
80
81   for Stream_Element_Array'Read use Read_SEA;
82   for Stream_Element_Array'Write use Write_SEA;
83
84end Ada.Streams;
85