gcc/ada/a-stream.ads

   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) 1992-2014, 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
  36 package 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 -(2 ** 63) .. +(2 ** 63) - 1;
  45
  46    subtype Stream_Element_Count is
  47       Stream_Element_Offset range 0 .. Stream_Element_Offset'Last;
  48
  49    type Stream_Element_Array is
  50       array (Stream_Element_Offset range <>) of aliased Stream_Element;
  51
  52    procedure Read
  53      (Stream : in out Root_Stream_Type;
  54       Item   : out Stream_Element_Array;
  55       Last   : out Stream_Element_Offset)
  56    is abstract;
  57
  58    procedure Write
  59      (Stream : in out Root_Stream_Type;
  60       Item   : Stream_Element_Array)
  61    is abstract;
  62
  63 private
  64
  65    type Root_Stream_Type is abstract tagged limited null record;
  66
  67    --  Stream attributes for Stream_Element_Array: trivially call the
  68    --  corresponding stream primitive for the whole array, instead of doing
  69    --  so element by element.
  70
  71    procedure Read_SEA
  72      (S : access Root_Stream_Type'Class;
  73       V : out Stream_Element_Array);
  74
  75    procedure Write_SEA
  76      (S : access Root_Stream_Type'Class;
  77       V : Stream_Element_Array);
  78
  79    for Stream_Element_Array'Read use Read_SEA;
  80    for Stream_Element_Array'Write use Write_SEA;
  81
  82 end Ada.Streams;