193 lines
7.2 KiB
Ada
193 lines
7.2 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT LIBRARY COMPONENTS --
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-- --
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-- 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 --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 2013-2015, Free Software Foundation, Inc. --
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-- --
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-- This specification is derived from the Ada Reference Manual for use with --
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-- GNAT. The copyright notice above, and the license provisions that follow --
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-- apply solely to the contents of the part following the private keyword. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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------------------------------------------------------------------------------
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-- This is an optimized version of Indefinite_Holders using copy-on-write.
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-- It is used on platforms that support atomic built-ins.
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private with Ada.Finalization;
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private with Ada.Streams;
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private with System.Atomic_Counters;
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generic
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type Element_Type (<>) is private;
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with function "=" (Left, Right : Element_Type) return Boolean is <>;
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package Ada.Containers.Indefinite_Holders is
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pragma Annotate (CodePeer, Skip_Analysis);
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pragma Preelaborate (Indefinite_Holders);
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pragma Remote_Types (Indefinite_Holders);
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type Holder is tagged private;
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pragma Preelaborable_Initialization (Holder);
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Empty_Holder : constant Holder;
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function "=" (Left, Right : Holder) return Boolean;
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function To_Holder (New_Item : Element_Type) return Holder;
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function Is_Empty (Container : Holder) return Boolean;
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procedure Clear (Container : in out Holder);
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function Element (Container : Holder) return Element_Type;
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procedure Replace_Element
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(Container : in out Holder;
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New_Item : Element_Type);
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procedure Query_Element
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(Container : Holder;
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Process : not null access procedure (Element : Element_Type));
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procedure Update_Element
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(Container : in out Holder;
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Process : not null access procedure (Element : in out Element_Type));
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type Constant_Reference_Type
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(Element : not null access constant Element_Type) is private
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with
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Implicit_Dereference => Element;
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type Reference_Type
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(Element : not null access Element_Type) is private
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with
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Implicit_Dereference => Element;
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function Constant_Reference
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(Container : aliased Holder) return Constant_Reference_Type;
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pragma Inline (Constant_Reference);
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function Reference
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(Container : aliased in out Holder) return Reference_Type;
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pragma Inline (Reference);
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procedure Assign (Target : in out Holder; Source : Holder);
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function Copy (Source : Holder) return Holder;
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procedure Move (Target : in out Holder; Source : in out Holder);
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private
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use Ada.Finalization;
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use Ada.Streams;
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type Element_Access is access all Element_Type;
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type Holder_Access is access all Holder;
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type Shared_Holder is record
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Counter : System.Atomic_Counters.Atomic_Counter;
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Element : Element_Access;
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end record;
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type Shared_Holder_Access is access all Shared_Holder;
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procedure Reference (Item : not null Shared_Holder_Access);
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-- Increment reference counter
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procedure Unreference (Item : not null Shared_Holder_Access);
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-- Decrement reference counter, deallocate Item when counter goes to zero
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procedure Read
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(Stream : not null access Ada.Streams.Root_Stream_Type'Class;
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Container : out Holder);
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procedure Write
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(Stream : not null access Ada.Streams.Root_Stream_Type'Class;
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Container : Holder);
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type Holder is new Ada.Finalization.Controlled with record
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Reference : Shared_Holder_Access;
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Busy : Natural := 0;
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end record;
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for Holder'Read use Read;
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for Holder'Write use Write;
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overriding procedure Adjust (Container : in out Holder);
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overriding procedure Finalize (Container : in out Holder);
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type Reference_Control_Type is new Controlled with record
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Container : Holder_Access;
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end record;
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overriding procedure Adjust (Control : in out Reference_Control_Type);
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pragma Inline (Adjust);
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overriding procedure Finalize (Control : in out Reference_Control_Type);
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pragma Inline (Finalize);
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type Constant_Reference_Type
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(Element : not null access constant Element_Type) is
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record
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Control : Reference_Control_Type :=
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raise Program_Error with "uninitialized reference";
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-- The RM says, "The default initialization of an object of
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-- type Constant_Reference_Type or Reference_Type propagates
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-- Program_Error."
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end record;
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procedure Write
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(Stream : not null access Root_Stream_Type'Class;
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Item : Constant_Reference_Type);
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for Constant_Reference_Type'Write use Write;
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procedure Read
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(Stream : not null access Root_Stream_Type'Class;
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Item : out Constant_Reference_Type);
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for Constant_Reference_Type'Read use Read;
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type Reference_Type (Element : not null access Element_Type) is record
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Control : Reference_Control_Type :=
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raise Program_Error with "uninitialized reference";
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-- The RM says, "The default initialization of an object of
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-- type Constant_Reference_Type or Reference_Type propagates
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-- Program_Error."
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end record;
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procedure Write
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(Stream : not null access Root_Stream_Type'Class;
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Item : Reference_Type);
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for Reference_Type'Write use Write;
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procedure Read
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(Stream : not null access Root_Stream_Type'Class;
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Item : out Reference_Type);
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for Reference_Type'Read use Read;
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Empty_Holder : constant Holder := (Controlled with null, 0);
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end Ada.Containers.Indefinite_Holders;
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