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------------------------------------------------------------------------------ -- -- -- GNAT LIBRARY COMPONENTS -- -- -- -- ADA.CONTAINERS.FORMAL_DOUBLY_LINKED_LISTS -- -- -- -- S p e c -- -- -- -- Copyright (C) 2004-2011, 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 spec is derived from Ada.Containers.Bounded_Doubly_Linked_Lists in the -- Ada 2012 RM. The modifications are to facilitate formal proofs by making it -- easier to express properties. -- The modifications are: -- A parameter for the container is added to every function reading the -- contents of a container: Next, Previous, Query_Element, Has_Element, -- Iterate, Reverse_Iterate, Element. This change is motivated by the need -- to have cursors which are valid on different containers (typically a -- container C and its previous version C'Old) for expressing properties, -- which is not possible if cursors encapsulate an access to the underlying -- container. -- There are three new functions: -- function Strict_Equal (Left, Right : List) return Boolean; -- function Left (Container : List; Position : Cursor) return List; -- function Right (Container : List; Position : Cursor) return List; -- See detailed specifications for these subprograms private with Ada.Streams; with Ada.Containers; with Ada.Iterator_Interfaces; generic type Element_Type is private; with function "=" (Left, Right : Element_Type) return Boolean is <>; package Ada.Containers.Formal_Doubly_Linked_Lists is pragma Pure; type List (Capacity : Count_Type) is tagged private with Constant_Indexing => Constant_Reference, Default_Iterator => Iterate, Iterator_Element => Element_Type; -- pragma Preelaborable_Initialization (List); type Cursor is private; pragma Preelaborable_Initialization (Cursor); Empty_List : constant List; No_Element : constant Cursor; function Not_No_Element (Position : Cursor) return Boolean; package List_Iterator_Interfaces is new Ada.Iterator_Interfaces (Cursor => Cursor, Has_Element => Not_No_Element); function Iterate (Container : List; Start : Cursor) return List_Iterator_Interfaces.Reversible_Iterator'Class; function Iterate (Container : List) return List_Iterator_Interfaces.Reversible_Iterator'Class; function "=" (Left, Right : List) return Boolean; function Length (Container : List) return Count_Type; function Is_Empty (Container : List) return Boolean; procedure Clear (Container : in out List); procedure Assign (Target : in out List; Source : List); function Copy (Source : List; Capacity : Count_Type := 0) return List; function Element (Container : List; Position : Cursor) return Element_Type; procedure Replace_Element (Container : in out List; Position : Cursor; New_Item : Element_Type); procedure Query_Element (Container : List; Position : Cursor; Process : not null access procedure (Element : Element_Type)); procedure Update_Element (Container : in out List; Position : Cursor; Process : not null access procedure (Element : in out Element_Type)); procedure Move (Target : in out List; Source : in out List); procedure Insert (Container : in out List; Before : Cursor; New_Item : Element_Type; Count : Count_Type := 1); procedure Insert (Container : in out List; Before : Cursor; New_Item : Element_Type; Position : out Cursor; Count : Count_Type := 1); procedure Insert (Container : in out List; Before : Cursor; Position : out Cursor; Count : Count_Type := 1); procedure Prepend (Container : in out List; New_Item : Element_Type; Count : Count_Type := 1); procedure Append (Container : in out List; New_Item : Element_Type; Count : Count_Type := 1); procedure Delete (Container : in out List; Position : in out Cursor; Count : Count_Type := 1); procedure Delete_First (Container : in out List; Count : Count_Type := 1); procedure Delete_Last (Container : in out List; Count : Count_Type := 1); procedure Reverse_Elements (Container : in out List); procedure Swap (Container : in out List; I, J : Cursor); procedure Swap_Links (Container : in out List; I, J : Cursor); procedure Splice (Target : in out List; Before : Cursor; Source : in out List); procedure Splice (Target : in out List; Before : Cursor; Source : in out List; Position : in out Cursor); procedure Splice (Container : in out List; Before : Cursor; Position : Cursor); function First (Container : List) return Cursor; function First_Element (Container : List) return Element_Type; function Last (Container : List) return Cursor; function Last_Element (Container : List) return Element_Type; function Next (Container : List; Position : Cursor) return Cursor; procedure Next (Container : List; Position : in out Cursor); function Previous (Container : List; Position : Cursor) return Cursor; procedure Previous (Container : List; Position : in out Cursor); function Find (Container : List; Item : Element_Type; Position : Cursor := No_Element) return Cursor; function Reverse_Find (Container : List; Item : Element_Type; Position : Cursor := No_Element) return Cursor; function Contains (Container : List; Item : Element_Type) return Boolean; function Has_Element (Container : List; Position : Cursor) return Boolean; procedure Iterate (Container : List; Process : not null access procedure (Container : List; Position : Cursor)); procedure Reverse_Iterate (Container : List; Process : not null access procedure (Container : List; Position : Cursor)); generic with function "<" (Left, Right : Element_Type) return Boolean is <>; package Generic_Sorting is function Is_Sorted (Container : List) return Boolean; procedure Sort (Container : in out List); procedure Merge (Target, Source : in out List); end Generic_Sorting; type Constant_Reference_Type (Element : not null access constant Element_Type) is private with Implicit_Dereference => Element; function Constant_Reference (Container : List; -- SHOULD BE ALIASED ??? Position : Cursor) return Constant_Reference_Type; function Strict_Equal (Left, Right : List) return Boolean; -- Strict_Equal returns True if the containers are physically equal, i.e. -- they are structurally equal (function "=" returns True) and that they -- have the same set of cursors. function Left (Container : List; Position : Cursor) return List; function Right (Container : List; Position : Cursor) return List; -- Left returns a container containing all elements preceding Position -- (excluded) in Container. Right returns a container containing all -- elements following Position (included) in Container. These two new -- functions can be used to express invariant properties in loops which -- iterate over containers. Left returns the part of the container already -- scanned and Right the part not scanned yet. private type Node_Type is record Prev : Count_Type'Base := -1; Next : Count_Type; Element : aliased Element_Type; end record; function "=" (L, R : Node_Type) return Boolean is abstract; type Node_Array is array (Count_Type range <>) of Node_Type; function "=" (L, R : Node_Array) return Boolean is abstract; type List (Capacity : Count_Type) is tagged record Nodes : Node_Array (1 .. Capacity) := (others => <>); Free : Count_Type'Base := -1; Busy : Natural := 0; Lock : Natural := 0; Length : Count_Type := 0; First : Count_Type := 0; Last : Count_Type := 0; end record; use Ada.Streams; procedure Read (Stream : not null access Root_Stream_Type'Class; Item : out List); for List'Read use Read; procedure Write (Stream : not null access Root_Stream_Type'Class; Item : List); for List'Write use Write; type List_Access is access all List; for List_Access'Storage_Size use 0; type Cursor is record Node : Count_Type := 0; end record; procedure Read (Stream : not null access Root_Stream_Type'Class; Item : out Cursor); for Cursor'Read use Read; procedure Write (Stream : not null access Root_Stream_Type'Class; Item : Cursor); for Cursor'Write use Write; Empty_List : constant List := (0, others => <>); No_Element : constant Cursor := (Node => 0); type Constant_Reference_Type (Element : not null access constant Element_Type) is null record; end Ada.Containers.Formal_Doubly_Linked_Lists;
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