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------------------------------------------------------------------------------
-- --
-- GNAT LIBRARY COMPONENTS --
-- --
-- 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 --
-- --
-- S p e c --
-- --
-- Copyright (C) 2013-2024, Free Software Foundation, Inc. --
-- --
-- This specification is derived from the Ada Reference Manual for use with --
-- GNAT. The copyright notice above, and the license provisions that follow --
-- apply solely to the contents of the part following the private keyword. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
------------------------------------------------------------------------------
-- This is an optimized version of Indefinite_Holders using copy-on-write.
-- It is used on platforms that support atomic built-ins.
private with Ada.Finalization;
private with Ada.Streams;
private with System.Atomic_Counters;
private with Ada.Strings.Text_Buffers;
generic
type Element_Type (<>) is private;
with function "=" (Left, Right : Element_Type) return Boolean is <>;
package Ada.Containers.Indefinite_Holders is
pragma Annotate (CodePeer, Skip_Analysis);
pragma Preelaborate (Indefinite_Holders);
pragma Remote_Types (Indefinite_Holders);
type Holder is tagged private;
pragma Preelaborable_Initialization (Holder);
Empty_Holder : constant Holder;
function "=" (Left, Right : Holder) return Boolean;
function To_Holder (New_Item : Element_Type) return Holder;
function Is_Empty (Container : Holder) return Boolean;
procedure Clear (Container : in out Holder);
function Element (Container : Holder) return Element_Type;
procedure Replace_Element
(Container : in out Holder;
New_Item : Element_Type);
procedure Query_Element
(Container : Holder;
Process : not null access procedure (Element : Element_Type));
procedure Update_Element
(Container : in out Holder;
Process : not null access procedure (Element : in out Element_Type));
type Constant_Reference_Type
(Element : not null access constant Element_Type) is private
with
Implicit_Dereference => Element;
type Reference_Type
(Element : not null access Element_Type) is private
with
Implicit_Dereference => Element;
function Constant_Reference
(Container : aliased Holder) return Constant_Reference_Type;
pragma Inline (Constant_Reference);
function Reference
(Container : aliased in out Holder) return Reference_Type;
pragma Inline (Reference);
procedure Assign (Target : in out Holder; Source : Holder);
function Copy (Source : Holder) return Holder;
procedure Move (Target : in out Holder; Source : in out Holder);
procedure Swap (Left, Right : in out Holder);
private
use Ada.Finalization;
use Ada.Streams;
type Element_Access is access all Element_Type;
type Holder_Access is access all Holder;
type Shared_Holder is record
Counter : System.Atomic_Counters.Atomic_Counter;
Element : Element_Access;
end record;
type Shared_Holder_Access is access all Shared_Holder;
procedure Reference (Item : not null Shared_Holder_Access);
-- Increment reference counter
procedure Unreference (Item : not null Shared_Holder_Access);
-- Decrement reference counter, deallocate Item when counter goes to zero
procedure Read
(Stream : not null access Ada.Streams.Root_Stream_Type'Class;
Container : out Holder);
procedure Write
(Stream : not null access Ada.Streams.Root_Stream_Type'Class;
Container : Holder);
type Holder is new Ada.Finalization.Controlled with record
Reference : Shared_Holder_Access;
Busy : Natural := 0;
end record with Put_Image => Put_Image;
procedure Put_Image
(S : in out Ada.Strings.Text_Buffers.Root_Buffer_Type'Class; V : Holder);
for Holder'Read use Read;
for Holder'Write use Write;
overriding procedure Adjust (Container : in out Holder);
overriding procedure Finalize (Container : in out Holder);
type Reference_Control_Type is new Controlled with record
Container : Holder_Access;
end record;
overriding procedure Adjust (Control : in out Reference_Control_Type);
pragma Inline (Adjust);
overriding procedure Finalize (Control : in out Reference_Control_Type);
pragma Inline (Finalize);
type Constant_Reference_Type
(Element : not null access constant Element_Type) is
record
Control : Reference_Control_Type :=
raise Program_Error with "uninitialized reference";
-- The RM says, "The default initialization of an object of
-- type Constant_Reference_Type or Reference_Type propagates
-- Program_Error."
end record;
procedure Write
(Stream : not null access Root_Stream_Type'Class;
Item : Constant_Reference_Type);
for Constant_Reference_Type'Write use Write;
procedure Read
(Stream : not null access Root_Stream_Type'Class;
Item : out Constant_Reference_Type);
for Constant_Reference_Type'Read use Read;
type Reference_Type (Element : not null access Element_Type) is record
Control : Reference_Control_Type :=
raise Program_Error with "uninitialized reference";
-- The RM says, "The default initialization of an object of
-- type Constant_Reference_Type or Reference_Type propagates
-- Program_Error."
end record;
procedure Write
(Stream : not null access Root_Stream_Type'Class;
Item : Reference_Type);
for Reference_Type'Write use Write;
procedure Read
(Stream : not null access Root_Stream_Type'Class;
Item : out Reference_Type);
for Reference_Type'Read use Read;
Empty_Holder : constant Holder := (Controlled with null, 0);
end Ada.Containers.Indefinite_Holders;
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