[Ada] Propagate documentation to formal bounded sets
2019-09-19 Raphael Amiard <amiard@adacore.com> gcc/ada/ * libgnat/a-cfhase.ads (Set): Add comments to public primitives. From-SVN: r275937
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@ -1,3 +1,7 @@
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2019-09-19 Raphael Amiard <amiard@adacore.com>
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* libgnat/a-cfhase.ads (Set): Add comments to public primitives.
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2019-09-19 Raphael Amiard <amiard@adacore.com>
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* libgnat/a-cbhama.ads, libgnat/a-cbhase.ads,
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@ -355,10 +355,24 @@ is
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"="'Result =
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(E_Elements_Included (Elements (Left), Elements (Right))
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and E_Elements_Included (Elements (Right), Elements (Left)));
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-- For each element in Left, set equality attempts to find the equal
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-- element in Right; if a search fails, then set equality immediately
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-- returns False. The search works by calling Hash to find the bucket in
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-- the Right set that corresponds to the Left element. If the bucket is
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-- non-empty, the search calls the generic formal element equality operator
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-- to compare the element (in Left) to the element of each node in the
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-- bucket (in Right); the search terminates when a matching node in the
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-- bucket is found, or the nodes in the bucket are exhausted. (Note that
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-- element equality is called here, not Equivalent_Elements. Set equality
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-- is the only operation in which element equality is used. Compare set
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-- equality to Equivalent_Sets, which does call Equivalent_Elements.)
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function Equivalent_Sets (Left, Right : Set) return Boolean with
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Global => null,
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Post => Equivalent_Sets'Result = (Model (Left) = Model (Right));
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-- Similar to set equality, with the difference that the element in Left is
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-- compared to the elements in Right using the generic formal
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-- Equivalent_Elements operation instead of element equality.
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function To_Set (New_Item : Element_Type) return Set with
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Global => null,
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@ -366,10 +380,14 @@ is
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M.Is_Singleton (Model (To_Set'Result), New_Item)
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and Length (To_Set'Result) = 1
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and E.Get (Elements (To_Set'Result), 1) = New_Item;
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-- Constructs a singleton set comprising New_Element. To_Set calls Hash to
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-- determine the bucket for New_Item.
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function Capacity (Container : Set) return Count_Type with
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Global => null,
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Post => Capacity'Result = Container.Capacity;
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-- Returns the current capacity of the set. Capacity is the maximum length
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-- before which rehashing in guaranteed not to occur.
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procedure Reserve_Capacity
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(Container : in out Set;
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@ -387,14 +405,21 @@ is
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(Elements (Container), Elements (Container)'Old)
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and E_Elements_Included
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(Elements (Container)'Old, Elements (Container));
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-- If the value of the Capacity actual parameter is less or equal to
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-- Container.Capacity, then the operation has no effect. Otherwise it
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-- raises Capacity_Error (as no expansion of capacity is possible for a
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-- bounded form).
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function Is_Empty (Container : Set) return Boolean with
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Global => null,
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Post => Is_Empty'Result = (Length (Container) = 0);
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-- Equivalent to Length (Container) = 0
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procedure Clear (Container : in out Set) with
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Global => null,
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Post => Length (Container) = 0 and M.Is_Empty (Model (Container));
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-- Removes all of the items from the set. This will deallocate all memory
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-- associated with this set.
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procedure Assign (Target : in out Set; Source : Set) with
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Global => null,
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@ -407,6 +432,10 @@ is
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and E_Elements_Included (Elements (Target), Elements (Source))
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and E_Elements_Included (Elements (Source), Elements (Target));
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-- If Target denotes the same object as Source, then the operation has no
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-- effect. If the Target capacity is less than the Source length, then
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-- Assign raises Capacity_Error. Otherwise, Assign clears Target and then
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-- copies the (active) elements from Source to Target.
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function Copy
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(Source : Set;
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@ -422,6 +451,14 @@ is
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Copy'Result.Capacity = Source.Capacity
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else
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Copy'Result.Capacity = Capacity);
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-- Constructs a new set object whose elements correspond to Source. If the
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-- Capacity parameter is 0, then the capacity of the result is the same as
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-- the length of Source. If the Capacity parameter is equal or greater than
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-- the length of Source, then the capacity of the result is the specified
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-- value. Otherwise, Copy raises Capacity_Error. If the Modulus parameter
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-- is 0, then the modulus of the result is the value returned by a call to
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-- Default_Modulus with the capacity parameter determined as above;
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-- otherwise the modulus of the result is the specified value.
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function Element
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(Container : Set;
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@ -485,6 +522,8 @@ is
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and E_Elements_Included (Elements (Target), Elements (Source)'Old)
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and E_Elements_Included (Elements (Source)'Old, Elements (Target));
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-- Clears Target (if it's not empty), and then moves (not copies) the
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-- buckets array and nodes from Source to Target.
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procedure Insert
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(Container : in out Set;
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(Positions (Container),
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Positions (Container)'Old,
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Position));
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-- Conditionally inserts New_Item into the set. If New_Item is already in
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-- the set, then Inserted returns False and Position designates the node
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-- containing the existing element (which is not modified). If New_Item is
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-- not already in the set, then Inserted returns True and Position
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-- designates the newly-inserted node containing New_Item. The search for
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-- an existing element works as follows. Hash is called to determine
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-- New_Item's bucket; if the bucket is non-empty, then Equivalent_Elements
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-- is called to compare New_Item to the element of each node in that
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-- bucket. If the bucket is empty, or there were no equivalent elements in
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-- the bucket, the search "fails" and the New_Item is inserted in the set
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-- (and Inserted returns True); otherwise, the search "succeeds" (and
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-- Inserted returns False).
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procedure Insert (Container : in out Set; New_Item : Element_Type) with
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Global => null,
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@ -570,6 +621,13 @@ is
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(Positions (Container),
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Positions (Container)'Old,
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Find (Container, New_Item));
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-- Attempts to insert New_Item into the set, performing the usual insertion
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-- search (which involves calling both Hash and Equivalent_Elements); if
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-- the search succeeds (New_Item is equivalent to an element already in the
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-- set, and so was not inserted), then this operation raises
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-- Constraint_Error. (This version of Insert is similar to Replace, but
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-- having the opposite exception behavior. It is intended for use when you
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-- want to assert that the item is not already in the set.)
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procedure Include (Container : in out Set; New_Item : Element_Type) with
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Global => null,
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@ -625,6 +683,13 @@ is
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(Positions (Container),
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Positions (Container)'Old,
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Find (Container, New_Item)));
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-- Attempts to insert New_Item into the set. If an element equivalent to
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-- New_Item is already in the set (the insertion search succeeded, and
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-- hence New_Item was not inserted), then the value of New_Item is assigned
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-- to the existing element. (This insertion operation only raises an
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-- exception if cursor tampering occurs. It is intended for use when you
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-- want to insert the item in the set, and you don't care whether an
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-- equivalent element is already present.)
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procedure Replace (Container : in out Set; New_Item : Element_Type) with
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Global => null,
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@ -648,6 +713,12 @@ is
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(Elements (Container)'Old,
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Elements (Container),
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P.Get (Positions (Container), Find (Container, New_Item)));
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-- Searches for New_Item in the set; if the search fails (because an
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-- equivalent element was not in the set), then it raises
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-- Constraint_Error. Otherwise, the existing element is assigned the value
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-- New_Item. (This is similar to Insert, but with the opposite exception
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-- behavior. It is intended for use when you want to assert that the item
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-- is already in the set.)
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procedure Exclude (Container : in out Set; Item : Element_Type) with
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Global => null,
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@ -685,6 +756,13 @@ is
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(Positions (Container)'Old,
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Positions (Container),
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Find (Container, Item)'Old));
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-- Searches for Item in the set, and if found, removes its node from the
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-- set and then deallocates it. The search works as follows. The operation
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-- calls Hash to determine the item's bucket; if the bucket is not empty,
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-- it calls Equivalent_Elements to compare Item to the element of each node
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-- in the bucket. (This is the deletion analog of Include. It is intended
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-- for use when you want to remove the item from the set, but don't care
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-- whether the item is already in the set.)
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procedure Delete (Container : in out Set; Item : Element_Type) with
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Global => null,
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@ -715,6 +793,12 @@ is
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(Positions (Container)'Old,
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Positions (Container),
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Find (Container, Item)'Old);
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-- Searches for Item in the set (which involves calling both Hash and
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-- Equivalent_Elements). If the search fails, then the operation raises
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-- Constraint_Error. Otherwise it removes the node from the set and then
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-- deallocates it. (This is the deletion analog of non-conditional
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-- Insert. It is intended for use when you want to assert that the item is
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-- already in the set.)
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procedure Delete (Container : in out Set; Position : in out Cursor) with
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Global => null,
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(Positions (Container)'Old,
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Positions (Container),
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Position'Old);
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-- Removes the node designated by Position from the set, and then
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-- deallocates the node. The operation calls Hash to determine the bucket,
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-- and then compares Position to each node in the bucket until there's a
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-- match (it does not call Equivalent_Elements).
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procedure Union (Target : in out Set; Source : Set) with
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Global => null,
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E_Right => Elements (Target),
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P_Left => Positions (Target)'Old,
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P_Right => Positions (Target));
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-- Iterates over the Source set, and conditionally inserts each element
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-- into Target.
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function Union (Left, Right : Set) return Set with
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Global => null,
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Model (Left),
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Elements (Right),
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Elements (Union'Result));
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-- The operation first copies the Left set to the result, and then iterates
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-- over the Right set to conditionally insert each element into the result.
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function "or" (Left, Right : Set) return Set renames Union;
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E_Right => Elements (Target)'Old,
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P_Left => Positions (Target),
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P_Right => Positions (Target)'Old);
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-- Iterates over the Target set (calling First and Next), calling Find to
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-- determine whether the element is in Source. If an equivalent element is
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-- not found in Source, the element is deleted from Target.
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function Intersection (Left, Right : Set) return Set with
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Global => null,
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and E_Elements_Included
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(Elements (Left), Model (Right),
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Elements (Intersection'Result));
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-- Iterates over the Left set, calling Find to determine whether the
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-- element is in Right. If an equivalent element is found, it is inserted
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-- into the result set.
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function "and" (Left, Right : Set) return Set renames Intersection;
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E_Right => Elements (Target)'Old,
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P_Left => Positions (Target),
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P_Right => Positions (Target)'Old);
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-- Iterates over the Source (calling First and Next), calling Find to
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-- determine whether the element is in Target. If an equivalent element is
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-- found, it is deleted from Target.
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function Difference (Left, Right : Set) return Set with
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Global => null,
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(Elements (Left),
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Model (Difference'Result),
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Elements (Difference'Result));
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-- Iterates over the Left set, calling Find to determine whether the
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-- element is in the Right set. If an equivalent element is not found, the
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-- element is inserted into the result set.
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function "-" (Left, Right : Set) return Set renames Difference;
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and E_Elements_Included
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(Elements (Source), Model (Target), Elements (Target));
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-- The operation iterates over the Source set, searching for the element
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-- in Target (calling Hash and Equivalent_Elements). If an equivalent
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-- element is found, it is removed from Target; otherwise it is inserted
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-- into Target.
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function Symmetric_Difference (Left, Right : Set) return Set with
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Global => null,
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(Elements (Right),
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Model (Symmetric_Difference'Result),
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Elements (Symmetric_Difference'Result));
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-- The operation first iterates over the Left set. It calls Find to
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-- determine whether the element is in the Right set. If no equivalent
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-- element is found, the element from Left is inserted into the result. The
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-- operation then iterates over the Right set, to determine whether the
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-- element is in the Left set. If no equivalent element is found, the Right
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-- element is inserted into the result.
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function "xor" (Left, Right : Set) return Set
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renames Symmetric_Difference;
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Global => null,
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Post =>
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Overlap'Result = not (M.No_Overlap (Model (Left), Model (Right)));
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-- Iterates over the Left set (calling First and Next), calling Find to
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-- determine whether the element is in the Right set. If an equivalent
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-- element is found, the operation immediately returns True. The operation
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-- returns False if the iteration over Left terminates without finding any
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-- equivalent element in Right.
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function Is_Subset (Subset : Set; Of_Set : Set) return Boolean with
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Global => null,
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Post => Is_Subset'Result = (Model (Subset) <= Model (Of_Set));
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-- Iterates over Subset (calling First and Next), calling Find to determine
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-- whether the element is in Of_Set. If no equivalent element is found in
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-- Of_Set, the operation immediately returns False. The operation returns
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-- True if the iteration over Subset terminates without finding an element
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-- not in Of_Set (that is, every element in Subset is equivalent to an
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-- element in Of_Set).
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function First (Container : Set) return Cursor with
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Global => null,
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others =>
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Has_Element (Container, First'Result)
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and P.Get (Positions (Container), First'Result) = 1);
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-- Returns a cursor that designates the first non-empty bucket, by
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-- searching from the beginning of the buckets array.
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function Next (Container : Set; Position : Cursor) return Cursor with
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Global => null,
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Has_Element (Container, Next'Result)
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and then P.Get (Positions (Container), Next'Result) =
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P.Get (Positions (Container), Position) + 1);
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-- Returns a cursor that designates the node that follows the current one
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-- designated by Position. If Position designates the last node in its
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-- bucket, the operation calls Hash to compute the index of this bucket,
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-- and searches the buckets array for the first non-empty bucket, starting
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-- from that index; otherwise, it simply follows the link to the next node
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-- in the same bucket.
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procedure Next (Container : Set; Position : in out Cursor) with
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Global => null,
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Has_Element (Container, Position)
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and then P.Get (Positions (Container), Position) =
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P.Get (Positions (Container), Position'Old) + 1);
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-- Equivalent to Position := Next (Position)
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function Find
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(Container : Set;
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and Equivalent_Elements
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(Element (Container, Find'Result), Item));
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-- Searches for Item in the set. Find calls Hash to determine the item's
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-- bucket; if the bucket is not empty, it calls Equivalent_Elements to
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-- compare Item to each element in the bucket. If the search succeeds, Find
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-- returns a cursor designating the node containing the equivalent element;
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-- otherwise, it returns No_Element.
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function Contains (Container : Set; Item : Element_Type) return Boolean with
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Global => null,
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