gcc/ada/libgnat/a-coinho.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT LIBRARY COMPONENTS                          --
   4 --                                                                          --
   5 --    A D A . C O N T A I N E R S . I N D E F I N I T E _ H O L D E R S     --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2011-2018, 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
  32 private with Ada.Finalization;
  33 private with Ada.Streams;
  34
  35 generic
  36    type Element_Type (<>) is private;
  37    with function "=" (Left, Right : Element_Type) return Boolean is <>;
  38
  39 package Ada.Containers.Indefinite_Holders is
  40    pragma Annotate (CodePeer, Skip_Analysis);
  41    pragma Preelaborate (Indefinite_Holders);
  42    pragma Remote_Types (Indefinite_Holders);
  43
  44    type Holder is tagged private;
  45    pragma Preelaborable_Initialization (Holder);
  46
  47    Empty_Holder : constant Holder;
  48
  49    function "=" (Left, Right : Holder) return Boolean;
  50
  51    function To_Holder (New_Item : Element_Type) return Holder;
  52
  53    function Is_Empty (Container : Holder) return Boolean;
  54
  55    procedure Clear (Container : in out Holder);
  56
  57    function Element (Container : Holder) return Element_Type;
  58
  59    procedure Replace_Element
  60      (Container : in out Holder;
  61       New_Item  : Element_Type);
  62
  63    procedure Query_Element
  64      (Container : Holder;
  65       Process   : not null access procedure (Element : Element_Type));
  66
  67    procedure Update_Element
  68      (Container : in out Holder;
  69       Process   : not null access procedure (Element : in out Element_Type));
  70
  71    type Constant_Reference_Type
  72       (Element : not null access constant Element_Type) is private
  73    with
  74       Implicit_Dereference => Element;
  75
  76    type Reference_Type
  77      (Element : not null access Element_Type) is private
  78    with
  79       Implicit_Dereference => Element;
  80
  81    function Constant_Reference
  82      (Container : aliased Holder) return Constant_Reference_Type;
  83    pragma Inline (Constant_Reference);
  84
  85    function Reference
  86      (Container : aliased in out Holder) return Reference_Type;
  87    pragma Inline (Reference);
  88
  89    procedure Assign (Target : in out Holder; Source : Holder);
  90
  91    function Copy (Source : Holder) return Holder;
  92
  93    procedure Move (Target : in out Holder; Source : in out Holder);
  94
  95 private
  96
  97    use Ada.Finalization;
  98    use Ada.Streams;
  99
 100    type Element_Access is access all Element_Type;
 101
 102    type Holder_Access is access all Holder;
 103    for Holder_Access'Storage_Size use 0;
 104
 105    procedure Read
 106      (Stream    : not null access Ada.Streams.Root_Stream_Type'Class;
 107       Container : out Holder);
 108
 109    procedure Write
 110      (Stream    : not null access Ada.Streams.Root_Stream_Type'Class;
 111       Container : Holder);
 112
 113    type Holder is new Ada.Finalization.Controlled with record
 114       Element : Element_Access;
 115       Busy    : Natural := 0;
 116    end record;
 117    for Holder'Read use Read;
 118    for Holder'Write use Write;
 119
 120    overriding procedure Adjust (Container : in out Holder);
 121    overriding procedure Finalize (Container : in out Holder);
 122
 123    type Reference_Control_Type is new Controlled with
 124    record
 125       Container : Holder_Access;
 126    end record;
 127
 128    overriding procedure Adjust (Control : in out Reference_Control_Type);
 129    pragma Inline (Adjust);
 130
 131    overriding procedure Finalize (Control : in out Reference_Control_Type);
 132    pragma Inline (Finalize);
 133
 134    type Constant_Reference_Type
 135      (Element : not null access constant Element_Type) is
 136       record
 137          Control : Reference_Control_Type :=
 138            raise Program_Error with "uninitialized reference";
 139          --  The RM says, "The default initialization of an object of
 140          --  type Constant_Reference_Type or Reference_Type propagates
 141          --  Program_Error."
 142       end record;
 143
 144    procedure Write
 145      (Stream : not null access Root_Stream_Type'Class;
 146       Item   : Constant_Reference_Type);
 147
 148    for Constant_Reference_Type'Write use Write;
 149
 150    procedure Read
 151      (Stream : not null access Root_Stream_Type'Class;
 152       Item   : out Constant_Reference_Type);
 153
 154    for Constant_Reference_Type'Read use Read;
 155
 156    type Reference_Type (Element : not null access Element_Type) is record
 157       Control : Reference_Control_Type :=
 158         raise Program_Error with "uninitialized reference";
 159       --  The RM says, "The default initialization of an object of
 160       --  type Constant_Reference_Type or Reference_Type propagates
 161       --  Program_Error."
 162    end record;
 163
 164    procedure Write
 165      (Stream : not null access Root_Stream_Type'Class;
 166       Item   : Reference_Type);
 167
 168    for Reference_Type'Write use Write;
 169
 170    procedure Read
 171      (Stream : not null access Root_Stream_Type'Class;
 172       Item   : out Reference_Type);
 173
 174    for Reference_Type'Read use Read;
 175
 176    Empty_Holder : constant Holder := (Controlled with null, 0);
 177
 178 end Ada.Containers.Indefinite_Holders;