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) 2011-2014, 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 32private with Ada.Finalization; 33private with Ada.Streams; 34 35generic 36 type Element_Type (<>) is private; 37 with function "=" (Left, Right : Element_Type) return Boolean is <>; 38 39package Ada.Containers.Indefinite_Holders is 40 pragma Preelaborate (Indefinite_Holders); 41 pragma Remote_Types (Indefinite_Holders); 42 43 type Holder is tagged private; 44 pragma Preelaborable_Initialization (Holder); 45 46 Empty_Holder : constant Holder; 47 48 function "=" (Left, Right : Holder) return Boolean; 49 50 function To_Holder (New_Item : Element_Type) return Holder; 51 52 function Is_Empty (Container : Holder) return Boolean; 53 54 procedure Clear (Container : in out Holder); 55 56 function Element (Container : Holder) return Element_Type; 57 58 procedure Replace_Element 59 (Container : in out Holder; 60 New_Item : Element_Type); 61 62 procedure Query_Element 63 (Container : Holder; 64 Process : not null access procedure (Element : Element_Type)); 65 66 procedure Update_Element 67 (Container : in out Holder; 68 Process : not null access procedure (Element : in out Element_Type)); 69 70 type Constant_Reference_Type 71 (Element : not null access constant Element_Type) is private 72 with 73 Implicit_Dereference => Element; 74 75 type Reference_Type 76 (Element : not null access Element_Type) is private 77 with 78 Implicit_Dereference => Element; 79 80 function Constant_Reference 81 (Container : aliased Holder) return Constant_Reference_Type; 82 pragma Inline (Constant_Reference); 83 84 function Reference 85 (Container : aliased in out Holder) return Reference_Type; 86 pragma Inline (Reference); 87 88 procedure Assign (Target : in out Holder; Source : Holder); 89 90 function Copy (Source : Holder) return Holder; 91 92 procedure Move (Target : in out Holder; Source : in out Holder); 93 94private 95 96 use Ada.Finalization; 97 use Ada.Streams; 98 99 type Element_Access is access all Element_Type; 100 101 type Holder_Access is access all Holder; 102 for Holder_Access'Storage_Size use 0; 103 104 procedure Read 105 (Stream : not null access Ada.Streams.Root_Stream_Type'Class; 106 Container : out Holder); 107 108 procedure Write 109 (Stream : not null access Ada.Streams.Root_Stream_Type'Class; 110 Container : Holder); 111 112 type Holder is new Ada.Finalization.Controlled with record 113 Element : Element_Access; 114 Busy : Natural := 0; 115 end record; 116 for Holder'Read use Read; 117 for Holder'Write use Write; 118 119 overriding procedure Adjust (Container : in out Holder); 120 overriding procedure Finalize (Container : in out Holder); 121 122 type Reference_Control_Type is new Controlled with 123 record 124 Container : Holder_Access; 125 end record; 126 127 overriding procedure Adjust (Control : in out Reference_Control_Type); 128 pragma Inline (Adjust); 129 130 overriding procedure Finalize (Control : in out Reference_Control_Type); 131 pragma Inline (Finalize); 132 133 type Constant_Reference_Type 134 (Element : not null access constant Element_Type) is 135 record 136 Control : Reference_Control_Type; 137 end record; 138 139 procedure Write 140 (Stream : not null access Root_Stream_Type'Class; 141 Item : Constant_Reference_Type); 142 143 for Constant_Reference_Type'Write use Write; 144 145 procedure Read 146 (Stream : not null access Root_Stream_Type'Class; 147 Item : out Constant_Reference_Type); 148 149 for Constant_Reference_Type'Read use Read; 150 151 type Reference_Type (Element : not null access Element_Type) is record 152 Control : Reference_Control_Type; 153 end record; 154 155 procedure Write 156 (Stream : not null access Root_Stream_Type'Class; 157 Item : Reference_Type); 158 159 for Reference_Type'Write use Write; 160 161 procedure Read 162 (Stream : not null access Root_Stream_Type'Class; 163 Item : out Reference_Type); 164 165 for Reference_Type'Read use Read; 166 167 Empty_Holder : constant Holder := (Controlled with null, 0); 168 169end Ada.Containers.Indefinite_Holders; 170