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) 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 32private with Ada.Finalization; 33private with Ada.Streams; 34private with System.Atomic_Counters; 35 36generic 37 type Element_Type (<>) is private; 38 with function "=" (Left, Right : Element_Type) return Boolean is <>; 39 40package Ada.Containers.Indefinite_Holders is 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 procedure Update_Element 67 (Container : Holder; 68 Process : not null access procedure (Element : in out Element_Type)); 69 70 procedure Assign (Target : in out Holder; Source : Holder); 71 72 function Copy (Source : Holder) return Holder; 73 74 procedure Move (Target : in out Holder; Source : in out Holder); 75 76private 77 78 package AF renames Ada.Finalization; 79 80 type Element_Access is access all Element_Type; 81 82 type Shared_Holder is record 83 Counter : System.Atomic_Counters.Atomic_Counter; 84 Element : Element_Access; 85 end record; 86 87 type Shared_Holder_Access is access all Shared_Holder; 88 89 procedure Reference (Item : not null Shared_Holder_Access); 90 -- Increment reference counter 91 92 procedure Unreference (Item : not null Shared_Holder_Access); 93 -- Decrement reference counter, deallocate Item when counter goes to zero 94 95 procedure Read 96 (Stream : not null access Ada.Streams.Root_Stream_Type'Class; 97 Container : out Holder); 98 99 procedure Write 100 (Stream : not null access Ada.Streams.Root_Stream_Type'Class; 101 Container : Holder); 102 103 type Holder is new Ada.Finalization.Controlled with record 104 Reference : Shared_Holder_Access; 105 Busy : Natural := 0; 106 end record; 107 for Holder'Read use Read; 108 for Holder'Write use Write; 109 110 overriding procedure Adjust (Container : in out Holder); 111 overriding procedure Finalize (Container : in out Holder); 112 113 Empty_Holder : constant Holder := (AF.Controlled with null, 0); 114 115end Ada.Containers.Indefinite_Holders; 116