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-------------------------------------------------------------------------------
--- --
--- GNAT LIBRARY COMPONENTS --
--- --
--- ADA.CONTAINERS.INDEFINITE_HASHED_MAPS --
--- --
--- S p e c --
--- --
--- Copyright (C) 2004-2009, 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 unit was originally developed by Matthew J Heaney. --
-------------------------------------------------------------------------------
-
-private with Ada.Containers.Hash_Tables;
-private with Ada.Streams;
-private with Ada.Finalization;
-
-generic
- type Key_Type (<>) is private;
- type Element_Type (<>) is private;
-
- with function Hash (Key : Key_Type) return Hash_Type;
- with function Equivalent_Keys (Left, Right : Key_Type) return Boolean;
- with function "=" (Left, Right : Element_Type) return Boolean is <>;
-
-package Ada.Containers.Indefinite_Hashed_Maps is
- pragma Preelaborate;
- pragma Remote_Types;
-
- type Map is tagged private;
- pragma Preelaborable_Initialization (Map);
-
- type Cursor is private;
- pragma Preelaborable_Initialization (Cursor);
-
- Empty_Map : constant Map;
- -- Map objects declared without an initialization expression are
- -- initialized to the value Empty_Map.
-
- No_Element : constant Cursor;
- -- Cursor objects declared without an initialization expression are
- -- initialized to the value No_Element.
-
- function "=" (Left, Right : Map) return Boolean;
- -- For each key/element pair in Left, equality attempts to find the key in
- -- Right; if a search fails the equality returns False. The search works by
- -- calling Hash to find the bucket in the Right map that corresponds to the
- -- Left key. If bucket is non-empty, then equality calls Equivalent_Keys
- -- to compare the key (in Left) to the key of each node in the bucket (in
- -- Right); if the keys are equivalent, then the equality test for this
- -- key/element pair (in Left) completes by calling the element equality
- -- operator to compare the element (in Left) to the element of the node
- -- (in Right) whose key matched.
-
- function Capacity (Container : Map) return Count_Type;
- -- Returns the current capacity of the map. Capacity is the maximum length
- -- before which rehashing in guaranteed not to occur.
-
- procedure Reserve_Capacity (Container : in out Map; Capacity : Count_Type);
- -- Adjusts the current capacity, by allocating a new buckets array. If the
- -- requested capacity is less than the current capacity, then the capacity
- -- is contracted (to a value not less than the current length). If the
- -- requested capacity is greater than the current capacity, then the
- -- capacity is expanded (to a value not less than what is requested). In
- -- either case, the nodes are rehashed from the old buckets array onto the
- -- new buckets array (Hash is called once for each existing key in order to
- -- compute the new index), and then the old buckets array is deallocated.
-
- function Length (Container : Map) return Count_Type;
- -- Returns the number of items in the map
-
- function Is_Empty (Container : Map) return Boolean;
- -- Equivalent to Length (Container) = 0
-
- procedure Clear (Container : in out Map);
- -- Removes all of the items from the map
-
- function Key (Position : Cursor) return Key_Type;
- -- Returns the key of the node designated by the cursor
-
- function Element (Position : Cursor) return Element_Type;
- -- Returns the element of the node designated by the cursor
-
- procedure Replace_Element
- (Container : in out Map;
- Position : Cursor;
- New_Item : Element_Type);
- -- Assigns the value New_Item to the element designated by the cursor
-
- procedure Query_Element
- (Position : Cursor;
- Process : not null access procedure (Key : Key_Type;
- Element : Element_Type));
- -- Calls Process with the key and element (both having only a constant
- -- view) of the node designed by the cursor.
-
- procedure Update_Element
- (Container : in out Map;
- Position : Cursor;
- Process : not null access procedure (Key : Key_Type;
- Element : in out Element_Type));
- -- Calls Process with the key (with only a constant view) and element (with
- -- a variable view) of the node designed by the cursor.
-
- procedure Move (Target : in out Map; Source : in out Map);
- -- Clears Target (if it's not empty), and then moves (not copies) the
- -- buckets array and nodes from Source to Target.
-
- procedure Insert
- (Container : in out Map;
- Key : Key_Type;
- New_Item : Element_Type;
- Position : out Cursor;
- Inserted : out Boolean);
- -- Conditionally inserts New_Item into the map. If Key is already in the
- -- map, then Inserted returns False and Position designates the node
- -- containing the existing key/element pair (neither of which is modified).
- -- If Key is not already in the map, the Inserted returns True and Position
- -- designates the newly-inserted node container Key and New_Item. The
- -- search for the key works as follows. Hash is called to determine Key's
- -- bucket; if the bucket is non-empty, then Equivalent_Keys is called to
- -- compare Key to each node in that bucket. If the bucket is empty, or
- -- there were no matching keys in the bucket, the search "fails" and the
- -- key/item pair is inserted in the map (and Inserted returns True);
- -- otherwise, the search "succeeds" (and Inserted returns False).
-
- procedure Insert
- (Container : in out Map;
- Key : Key_Type;
- New_Item : Element_Type);
- -- Attempts to insert Key into the map, performing the usual search (which
- -- involves calling both Hash and Equivalent_Keys); if the search succeeds
- -- (because Key is already in the map), then it raises Constraint_Error.
- -- (This version of Insert is similar to Replace, but having the opposite
- -- exception behavior. It is intended for use when you want to assert that
- -- Key is not already in the map.)
-
- procedure Include
- (Container : in out Map;
- Key : Key_Type;
- New_Item : Element_Type);
- -- Attempts to insert Key into the map. If Key is already in the map, then
- -- both the existing key and element are assigned the values of Key and
- -- New_Item, respectively. (This version of Insert only raises an exception
- -- if cursor tampering occurs. It is intended for use when you want to
- -- insert the key/element pair in the map, and you don't care whether Key
- -- is already present.)
-
- procedure Replace
- (Container : in out Map;
- Key : Key_Type;
- New_Item : Element_Type);
- -- Searches for Key in the map; if the search fails (because Key was not in
- -- the map), then it raises Constraint_Error. Otherwise, both the existing
- -- key and element are assigned the values of Key and New_Item rsp. (This
- -- is similar to Insert, but with the opposite exception behavior. It is
- -- intended for use when you want to assert that Key is already in the
- -- map.)
-
- procedure Exclude (Container : in out Map; Key : Key_Type);
- -- Searches for Key in the map, and if found, removes its node from the map
- -- and then deallocates it. The search works as follows. The operation
- -- calls Hash to determine the key's bucket; if the bucket is not empty, it
- -- calls Equivalent_Keys to compare Key to each key in the bucket. (This is
- -- the deletion analog of Include. It is intended for use when you want to
- -- remove the item from the map, but don't care whether the key is already
- -- in the map.)
-
- procedure Delete (Container : in out Map; Key : Key_Type);
- -- Searches for Key in the map (which involves calling both Hash and
- -- Equivalent_Keys). If the search fails, then the operation raises
- -- Constraint_Error. Otherwise it removes the node from the map and then
- -- deallocates it. (This is the deletion analog of non-conditional
- -- Insert. It is intended for use when you want to assert that the item is
- -- already in the map.)
-
- procedure Delete (Container : in out Map; Position : in out Cursor);
- -- Removes the node designated by Position from the map, and then
- -- deallocates the node. The operation calls Hash to determine the bucket,
- -- and then compares Position to each node in the bucket until there's a
- -- match (it does not call Equivalent_Keys).
-
- function First (Container : Map) return Cursor;
- -- Returns a cursor that designates the first non-empty bucket, by
- -- searching from the beginning of the buckets array.
-
- function Next (Position : Cursor) return Cursor;
- -- Returns a cursor that designates the node that follows the current one
- -- designated by Position. If Position designates the last node in its
- -- bucket, the operation calls Hash to compute the index of this bucket,
- -- and searches the buckets array for the first non-empty bucket, starting
- -- from that index; otherwise, it simply follows the link to the next node
- -- in the same bucket.
-
- procedure Next (Position : in out Cursor);
- -- Equivalent to Position := Next (Position)
-
- function Find (Container : Map; Key : Key_Type) return Cursor;
- -- Searches for Key in the map. Find calls Hash to determine the key's
- -- bucket; if the bucket is not empty, it calls Equivalent_Keys to compare
- -- Key to each key in the bucket. If the search succeeds, Find returns a
- -- cursor designating the matching node; otherwise, it returns No_Element.
-
- function Contains (Container : Map; Key : Key_Type) return Boolean;
- -- Equivalent to Find (Container, Key) /= No_Element
-
- function Element (Container : Map; Key : Key_Type) return Element_Type;
- -- Equivalent to Element (Find (Container, Key))
-
- function Has_Element (Position : Cursor) return Boolean;
- -- Equivalent to Position /= No_Element
-
- function Equivalent_Keys (Left, Right : Cursor) return Boolean;
- -- Returns the result of calling Equivalent_Keys with the keys of the nodes
- -- designated by cursors Left and Right.
-
- function Equivalent_Keys (Left : Cursor; Right : Key_Type) return Boolean;
- -- Returns the result of calling Equivalent_Keys with key of the node
- -- designated by Left and key Right.
-
- function Equivalent_Keys (Left : Key_Type; Right : Cursor) return Boolean;
- -- Returns the result of calling Equivalent_Keys with key Left and the node
- -- designated by Right.
-
- procedure Iterate
- (Container : Map;
- Process : not null access procedure (Position : Cursor));
- -- Calls Process for each node in the map
-
-private
- pragma Inline ("=");
- pragma Inline (Length);
- pragma Inline (Is_Empty);
- pragma Inline (Clear);
- pragma Inline (Key);
- pragma Inline (Element);
- pragma Inline (Move);
- pragma Inline (Contains);
- pragma Inline (Capacity);
- pragma Inline (Reserve_Capacity);
- pragma Inline (Has_Element);
- pragma Inline (Equivalent_Keys);
- pragma Inline (Next);
-
- type Node_Type;
- type Node_Access is access Node_Type;
-
- type Key_Access is access Key_Type;
- type Element_Access is access Element_Type;
-
- type Node_Type is limited record
- Key : Key_Access;
- Element : Element_Access;
- Next : Node_Access;
- end record;
-
- package HT_Types is new Hash_Tables.Generic_Hash_Table_Types
- (Node_Type,
- Node_Access);
-
- type Map is new Ada.Finalization.Controlled with record
- HT : HT_Types.Hash_Table_Type;
- end record;
-
- use HT_Types;
- use Ada.Finalization;
- use Ada.Streams;
-
- overriding
- procedure Adjust (Container : in out Map);
-
- overriding
- procedure Finalize (Container : in out Map);
-
- type Map_Access is access constant Map;
- for Map_Access'Storage_Size use 0;
-
- type Cursor is
- record
- Container : Map_Access;
- Node : Node_Access;
- 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 :=
- (Container => null,
- Node => null);
-
- procedure Write
- (Stream : not null access Root_Stream_Type'Class;
- Container : Map);
-
- for Map'Write use Write;
-
- procedure Read
- (Stream : not null access Root_Stream_Type'Class;
- Container : out Map);
-
- for Map'Read use Read;
-
- Empty_Map : constant Map := (Controlled with HT => (null, 0, 0, 0));
-
-end Ada.Containers.Indefinite_Hashed_Maps;