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------------------------------------------------------------------------------ -- -- -- GNAT LIBRARY COMPONENTS -- -- -- -- A D A . C O N T A I N E R S . F O R M A L _ H A S H E D _ S E T S -- -- -- -- 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 package Ada.Containers.Bounded_Hashed_Sets 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 -- content of a container: Element, Next, Query_Element, Has_Element, Key, -- Iterate, Equivalent_Elements. 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 : Set) return Boolean; -- function Left (Container : Set; Position : Cursor) return Set; -- function Right (Container : Set; Position : Cursor) return Set; -- See detailed specifications for these subprograms private with Ada.Containers.Hash_Tables; private with Ada.Streams; generic type Element_Type is private; with function Hash (Element : Element_Type) return Hash_Type; with function Equivalent_Elements (Left, Right : Element_Type) return Boolean; with function "=" (Left, Right : Element_Type) return Boolean is <>; package Ada.Containers.Formal_Hashed_Sets is pragma Pure; type Set (Capacity : Count_Type; Modulus : Hash_Type) is tagged private; -- why is this commented out ??? -- pragma Preelaborable_Initialization (Set); type Cursor is private; pragma Preelaborable_Initialization (Cursor); Empty_Set : constant Set; No_Element : constant Cursor; function "=" (Left, Right : Set) return Boolean; function Equivalent_Sets (Left, Right : Set) return Boolean; function To_Set (New_Item : Element_Type) return Set; function Capacity (Container : Set) return Count_Type; procedure Reserve_Capacity (Container : in out Set; Capacity : Count_Type); function Length (Container : Set) return Count_Type; function Is_Empty (Container : Set) return Boolean; procedure Clear (Container : in out Set); procedure Assign (Target : in out Set; Source : Set); function Copy (Source : Set; Capacity : Count_Type := 0) return Set; function Element (Container : Set; Position : Cursor) return Element_Type; procedure Replace_Element (Container : in out Set; Position : Cursor; New_Item : Element_Type); procedure Query_Element (Container : in out Set; Position : Cursor; Process : not null access procedure (Element : Element_Type)); procedure Move (Target : in out Set; Source : in out Set); procedure Insert (Container : in out Set; New_Item : Element_Type; Position : out Cursor; Inserted : out Boolean); procedure Insert (Container : in out Set; New_Item : Element_Type); procedure Include (Container : in out Set; New_Item : Element_Type); procedure Replace (Container : in out Set; New_Item : Element_Type); procedure Exclude (Container : in out Set; Item : Element_Type); procedure Delete (Container : in out Set; Item : Element_Type); procedure Delete (Container : in out Set; Position : in out Cursor); procedure Union (Target : in out Set; Source : Set); function Union (Left, Right : Set) return Set; function "or" (Left, Right : Set) return Set renames Union; procedure Intersection (Target : in out Set; Source : Set); function Intersection (Left, Right : Set) return Set; function "and" (Left, Right : Set) return Set renames Intersection; procedure Difference (Target : in out Set; Source : Set); function Difference (Left, Right : Set) return Set; function "-" (Left, Right : Set) return Set renames Difference; procedure Symmetric_Difference (Target : in out Set; Source : Set); function Symmetric_Difference (Left, Right : Set) return Set; function "xor" (Left, Right : Set) return Set renames Symmetric_Difference; function Overlap (Left, Right : Set) return Boolean; function Is_Subset (Subset : Set; Of_Set : Set) return Boolean; function First (Container : Set) return Cursor; function Next (Container : Set; Position : Cursor) return Cursor; procedure Next (Container : Set; Position : in out Cursor); function Find (Container : Set; Item : Element_Type) return Cursor; function Contains (Container : Set; Item : Element_Type) return Boolean; function Has_Element (Container : Set; Position : Cursor) return Boolean; function Equivalent_Elements (Left : Set; CLeft : Cursor; Right : Set; CRight : Cursor) return Boolean; function Equivalent_Elements (Left : Set; CLeft : Cursor; Right : Element_Type) return Boolean; function Equivalent_Elements (Left : Element_Type; Right : Set; CRight : Cursor) return Boolean; procedure Iterate (Container : Set; Process : not null access procedure (Container : Set; Position : Cursor)); function Default_Modulus (Capacity : Count_Type) return Hash_Type; generic type Key_Type (<>) is private; with function Key (Element : Element_Type) return Key_Type; with function Hash (Key : Key_Type) return Hash_Type; with function Equivalent_Keys (Left, Right : Key_Type) return Boolean; package Generic_Keys is function Key (Container : Set; Position : Cursor) return Key_Type; function Element (Container : Set; Key : Key_Type) return Element_Type; procedure Replace (Container : in out Set; Key : Key_Type; New_Item : Element_Type); procedure Exclude (Container : in out Set; Key : Key_Type); procedure Delete (Container : in out Set; Key : Key_Type); function Find (Container : Set; Key : Key_Type) return Cursor; function Contains (Container : Set; Key : Key_Type) return Boolean; procedure Update_Element_Preserving_Key (Container : in out Set; Position : Cursor; Process : not null access procedure (Element : in out Element_Type)); end Generic_Keys; function Strict_Equal (Left, Right : Set) 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 : Set; Position : Cursor) return Set; function Right (Container : Set; Position : Cursor) return Set; -- 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 pragma Inline (Next); type Node_Type is record Element : Element_Type; Next : Count_Type; Has_Element : Boolean := False; end record; package HT_Types is new Ada.Containers.Hash_Tables.Generic_Bounded_Hash_Table_Types (Node_Type); type Set (Capacity : Count_Type; Modulus : Hash_Type) is new HT_Types.Hash_Table_Type (Capacity, Modulus) with null record; use HT_Types; use Ada.Streams; type Cursor is record Node : Count_Type; end record; procedure Write (Stream : not null access Root_Stream_Type'Class; Item : Cursor); for Cursor'Write use Write; procedure Read (Stream : not null access Root_Stream_Type'Class; Item : out Cursor); for Cursor'Read use Read; No_Element : constant Cursor := (Node => 0); procedure Write (Stream : not null access Root_Stream_Type'Class; Container : Set); for Set'Write use Write; procedure Read (Stream : not null access Root_Stream_Type'Class; Container : out Set); for Set'Read use Read; Empty_Set : constant Set := (Capacity => 0, Modulus => 0, others => <>); end Ada.Containers.Formal_Hashed_Sets;
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