| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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 _ M A P S -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 2010-2021, Free Software Foundation, Inc. -- |
| -- -- |
| -- 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/>. -- |
| ------------------------------------------------------------------------------ |
| |
| with Ada.Containers.Hash_Tables.Generic_Bounded_Operations; |
| pragma Elaborate_All (Ada.Containers.Hash_Tables.Generic_Bounded_Operations); |
| |
| with Ada.Containers.Hash_Tables.Generic_Bounded_Keys; |
| pragma Elaborate_All (Ada.Containers.Hash_Tables.Generic_Bounded_Keys); |
| |
| with Ada.Containers.Prime_Numbers; use Ada.Containers.Prime_Numbers; |
| |
| with System; use type System.Address; |
| |
| package body Ada.Containers.Formal_Hashed_Maps with |
| SPARK_Mode => Off |
| is |
| ----------------------- |
| -- Local Subprograms -- |
| ----------------------- |
| |
| -- All local subprograms require comments ??? |
| |
| function Equivalent_Keys |
| (Key : Key_Type; |
| Node : Node_Type) return Boolean; |
| pragma Inline (Equivalent_Keys); |
| |
| procedure Free |
| (HT : in out Map; |
| X : Count_Type); |
| |
| generic |
| with procedure Set_Element (Node : in out Node_Type); |
| procedure Generic_Allocate |
| (HT : in out Map; |
| Node : out Count_Type); |
| |
| function Hash_Node (Node : Node_Type) return Hash_Type; |
| pragma Inline (Hash_Node); |
| |
| function Next (Node : Node_Type) return Count_Type; |
| pragma Inline (Next); |
| |
| procedure Set_Next (Node : in out Node_Type; Next : Count_Type); |
| pragma Inline (Set_Next); |
| |
| function Vet (Container : Map; Position : Cursor) return Boolean; |
| |
| -------------------------- |
| -- Local Instantiations -- |
| -------------------------- |
| |
| package HT_Ops is |
| new Hash_Tables.Generic_Bounded_Operations |
| (HT_Types => HT_Types, |
| Hash_Node => Hash_Node, |
| Next => Next, |
| Set_Next => Set_Next); |
| |
| package Key_Ops is |
| new Hash_Tables.Generic_Bounded_Keys |
| (HT_Types => HT_Types, |
| Next => Next, |
| Set_Next => Set_Next, |
| Key_Type => Key_Type, |
| Hash => Hash, |
| Equivalent_Keys => Equivalent_Keys); |
| |
| --------- |
| -- "=" -- |
| --------- |
| |
| function "=" (Left, Right : Map) return Boolean is |
| begin |
| if Length (Left) /= Length (Right) then |
| return False; |
| end if; |
| |
| if Length (Left) = 0 then |
| return True; |
| end if; |
| |
| declare |
| Node : Count_Type; |
| ENode : Count_Type; |
| |
| begin |
| Node := First (Left).Node; |
| while Node /= 0 loop |
| ENode := |
| Find |
| (Container => Right, |
| Key => Left.Content.Nodes (Node).Key).Node; |
| |
| if ENode = 0 or else |
| Right.Content.Nodes (ENode).Element /= |
| Left.Content.Nodes (Node).Element |
| then |
| return False; |
| end if; |
| |
| Node := HT_Ops.Next (Left.Content, Node); |
| end loop; |
| |
| return True; |
| end; |
| end "="; |
| |
| ------------ |
| -- Assign -- |
| ------------ |
| |
| procedure Assign (Target : in out Map; Source : Map) is |
| procedure Insert_Element (Source_Node : Count_Type); |
| pragma Inline (Insert_Element); |
| |
| procedure Insert_Elements is |
| new HT_Ops.Generic_Iteration (Insert_Element); |
| |
| -------------------- |
| -- Insert_Element -- |
| -------------------- |
| |
| procedure Insert_Element (Source_Node : Count_Type) is |
| N : Node_Type renames Source.Content.Nodes (Source_Node); |
| begin |
| Insert (Target, N.Key, N.Element); |
| end Insert_Element; |
| |
| -- Start of processing for Assign |
| |
| begin |
| if Target'Address = Source'Address then |
| return; |
| end if; |
| |
| if Target.Capacity < Length (Source) then |
| raise Constraint_Error with -- correct exception ??? |
| "Source length exceeds Target capacity"; |
| end if; |
| |
| Clear (Target); |
| |
| Insert_Elements (Source.Content); |
| end Assign; |
| |
| -------------- |
| -- Capacity -- |
| -------------- |
| |
| function Capacity (Container : Map) return Count_Type is |
| begin |
| return Container.Content.Nodes'Length; |
| end Capacity; |
| |
| ----------- |
| -- Clear -- |
| ----------- |
| |
| procedure Clear (Container : in out Map) is |
| begin |
| HT_Ops.Clear (Container.Content); |
| end Clear; |
| |
| ------------------------ |
| -- Constant_Reference -- |
| ------------------------ |
| |
| function Constant_Reference |
| (Container : aliased Map; |
| Position : Cursor) return not null access constant Element_Type |
| is |
| begin |
| if not Has_Element (Container, Position) then |
| raise Constraint_Error with "Position cursor has no element"; |
| end if; |
| |
| pragma Assert |
| (Vet (Container, Position), |
| "bad cursor in function Constant_Reference"); |
| |
| return Container.Content.Nodes (Position.Node).Element'Access; |
| end Constant_Reference; |
| |
| function Constant_Reference |
| (Container : aliased Map; |
| Key : Key_Type) return not null access constant Element_Type |
| is |
| Node : constant Count_Type := Find (Container, Key).Node; |
| |
| begin |
| if Node = 0 then |
| raise Constraint_Error with |
| "no element available because key not in map"; |
| end if; |
| |
| return Container.Content.Nodes (Node).Element'Access; |
| end Constant_Reference; |
| |
| -------------- |
| -- Contains -- |
| -------------- |
| |
| function Contains (Container : Map; Key : Key_Type) return Boolean is |
| begin |
| return Find (Container, Key) /= No_Element; |
| end Contains; |
| |
| ---------- |
| -- Copy -- |
| ---------- |
| |
| function Copy |
| (Source : Map; |
| Capacity : Count_Type := 0) return Map |
| is |
| C : constant Count_Type := |
| Count_Type'Max (Capacity, Source.Capacity); |
| Cu : Cursor; |
| H : Hash_Type; |
| N : Count_Type; |
| Target : Map (C, Source.Modulus); |
| |
| begin |
| if 0 < Capacity and then Capacity < Source.Capacity then |
| raise Capacity_Error; |
| end if; |
| |
| Target.Content.Length := Source.Content.Length; |
| Target.Content.Free := Source.Content.Free; |
| |
| H := 1; |
| while H <= Source.Modulus loop |
| Target.Content.Buckets (H) := Source.Content.Buckets (H); |
| H := H + 1; |
| end loop; |
| |
| N := 1; |
| while N <= Source.Capacity loop |
| Target.Content.Nodes (N) := Source.Content.Nodes (N); |
| N := N + 1; |
| end loop; |
| |
| while N <= C loop |
| Cu := (Node => N); |
| Free (Target, Cu.Node); |
| N := N + 1; |
| end loop; |
| |
| return Target; |
| end Copy; |
| |
| --------------------- |
| -- Default_Modulus -- |
| --------------------- |
| |
| function Default_Modulus (Capacity : Count_Type) return Hash_Type is |
| begin |
| return To_Prime (Capacity); |
| end Default_Modulus; |
| |
| ------------ |
| -- Delete -- |
| ------------ |
| |
| procedure Delete (Container : in out Map; Key : Key_Type) is |
| X : Count_Type; |
| |
| begin |
| Key_Ops.Delete_Key_Sans_Free (Container.Content, Key, X); |
| |
| if X = 0 then |
| raise Constraint_Error with "attempt to delete key not in map"; |
| end if; |
| |
| Free (Container, X); |
| end Delete; |
| |
| procedure Delete (Container : in out Map; Position : in out Cursor) is |
| begin |
| if not Has_Element (Container, Position) then |
| raise Constraint_Error with |
| "Position cursor of Delete has no element"; |
| end if; |
| |
| pragma Assert (Vet (Container, Position), "bad cursor in Delete"); |
| |
| HT_Ops.Delete_Node_Sans_Free (Container.Content, Position.Node); |
| |
| Free (Container, Position.Node); |
| Position := No_Element; |
| end Delete; |
| |
| ------------- |
| -- Element -- |
| ------------- |
| |
| function Element (Container : Map; Key : Key_Type) return Element_Type is |
| Node : constant Count_Type := Find (Container, Key).Node; |
| |
| begin |
| if Node = 0 then |
| raise Constraint_Error with |
| "no element available because key not in map"; |
| end if; |
| |
| return Container.Content.Nodes (Node).Element; |
| end Element; |
| |
| function Element (Container : Map; Position : Cursor) return Element_Type is |
| begin |
| if not Has_Element (Container, Position) then |
| raise Constraint_Error with "Position cursor equals No_Element"; |
| end if; |
| |
| pragma Assert |
| (Vet (Container, Position), "bad cursor in function Element"); |
| |
| return Container.Content.Nodes (Position.Node).Element; |
| end Element; |
| |
| --------------------- |
| -- Equivalent_Keys -- |
| --------------------- |
| |
| function Equivalent_Keys |
| (Key : Key_Type; |
| Node : Node_Type) return Boolean |
| is |
| begin |
| return Equivalent_Keys (Key, Node.Key); |
| end Equivalent_Keys; |
| |
| ------------- |
| -- Exclude -- |
| ------------- |
| |
| procedure Exclude (Container : in out Map; Key : Key_Type) is |
| X : Count_Type; |
| begin |
| Key_Ops.Delete_Key_Sans_Free (Container.Content, Key, X); |
| Free (Container, X); |
| end Exclude; |
| |
| ---------- |
| -- Find -- |
| ---------- |
| |
| function Find (Container : Map; Key : Key_Type) return Cursor is |
| Node : constant Count_Type := Key_Ops.Find (Container.Content, Key); |
| |
| begin |
| if Node = 0 then |
| return No_Element; |
| end if; |
| |
| return (Node => Node); |
| end Find; |
| |
| ----------- |
| -- First -- |
| ----------- |
| |
| function First (Container : Map) return Cursor is |
| Node : constant Count_Type := HT_Ops.First (Container.Content); |
| |
| begin |
| if Node = 0 then |
| return No_Element; |
| end if; |
| |
| return (Node => Node); |
| end First; |
| |
| ------------------ |
| -- Formal_Model -- |
| ------------------ |
| |
| package body Formal_Model is |
| |
| ---------- |
| -- Find -- |
| ---------- |
| |
| function Find |
| (Container : K.Sequence; |
| Key : Key_Type) return Count_Type |
| is |
| begin |
| for I in 1 .. K.Length (Container) loop |
| if Equivalent_Keys (Key, K.Get (Container, I)) then |
| return I; |
| end if; |
| end loop; |
| return 0; |
| end Find; |
| |
| --------------------- |
| -- K_Keys_Included -- |
| --------------------- |
| |
| function K_Keys_Included |
| (Left : K.Sequence; |
| Right : K.Sequence) return Boolean |
| is |
| begin |
| for I in 1 .. K.Length (Left) loop |
| if not K.Contains (Right, 1, K.Length (Right), K.Get (Left, I)) |
| then |
| return False; |
| end if; |
| end loop; |
| |
| return True; |
| end K_Keys_Included; |
| |
| ---------- |
| -- Keys -- |
| ---------- |
| |
| function Keys (Container : Map) return K.Sequence is |
| Position : Count_Type := HT_Ops.First (Container.Content); |
| R : K.Sequence; |
| |
| begin |
| -- Can't use First, Next or Element here, since they depend on models |
| -- for their postconditions. |
| |
| while Position /= 0 loop |
| R := K.Add (R, Container.Content.Nodes (Position).Key); |
| Position := HT_Ops.Next (Container.Content, Position); |
| end loop; |
| |
| return R; |
| end Keys; |
| |
| ---------------------------- |
| -- Lift_Abstraction_Level -- |
| ---------------------------- |
| |
| procedure Lift_Abstraction_Level (Container : Map) is null; |
| |
| ----------------------- |
| -- Mapping_Preserved -- |
| ----------------------- |
| |
| function Mapping_Preserved |
| (K_Left : K.Sequence; |
| K_Right : K.Sequence; |
| P_Left : P.Map; |
| P_Right : P.Map) return Boolean |
| is |
| begin |
| for C of P_Left loop |
| if not P.Has_Key (P_Right, C) |
| or else P.Get (P_Left, C) > K.Length (K_Left) |
| or else P.Get (P_Right, C) > K.Length (K_Right) |
| or else K.Get (K_Left, P.Get (P_Left, C)) /= |
| K.Get (K_Right, P.Get (P_Right, C)) |
| then |
| return False; |
| end if; |
| end loop; |
| |
| return True; |
| end Mapping_Preserved; |
| |
| ----------- |
| -- Model -- |
| ----------- |
| |
| function Model (Container : Map) return M.Map is |
| Position : Count_Type := HT_Ops.First (Container.Content); |
| R : M.Map; |
| |
| begin |
| -- Can't use First, Next or Element here, since they depend on models |
| -- for their postconditions. |
| |
| while Position /= 0 loop |
| R := |
| M.Add |
| (Container => R, |
| New_Key => Container.Content.Nodes (Position).Key, |
| New_Item => Container.Content.Nodes (Position).Element); |
| |
| Position := HT_Ops.Next (Container.Content, Position); |
| end loop; |
| |
| return R; |
| end Model; |
| |
| --------------- |
| -- Positions -- |
| --------------- |
| |
| function Positions (Container : Map) return P.Map is |
| I : Count_Type := 1; |
| Position : Count_Type := HT_Ops.First (Container.Content); |
| R : P.Map; |
| |
| begin |
| -- Can't use First, Next or Element here, since they depend on models |
| -- for their postconditions. |
| |
| while Position /= 0 loop |
| R := P.Add (R, (Node => Position), I); |
| pragma Assert (P.Length (R) = I); |
| Position := HT_Ops.Next (Container.Content, Position); |
| I := I + 1; |
| end loop; |
| |
| return R; |
| end Positions; |
| |
| end Formal_Model; |
| |
| ---------- |
| -- Free -- |
| ---------- |
| |
| procedure Free (HT : in out Map; X : Count_Type) is |
| begin |
| if X /= 0 then |
| pragma Assert (X <= HT.Capacity); |
| HT.Content.Nodes (X).Has_Element := False; |
| HT_Ops.Free (HT.Content, X); |
| end if; |
| end Free; |
| |
| ---------------------- |
| -- Generic_Allocate -- |
| ---------------------- |
| |
| procedure Generic_Allocate (HT : in out Map; Node : out Count_Type) is |
| procedure Allocate is |
| new HT_Ops.Generic_Allocate (Set_Element); |
| |
| begin |
| Allocate (HT.Content, Node); |
| HT.Content.Nodes (Node).Has_Element := True; |
| end Generic_Allocate; |
| |
| ----------------- |
| -- Has_Element -- |
| ----------------- |
| |
| function Has_Element (Container : Map; Position : Cursor) return Boolean is |
| begin |
| if Position.Node = 0 |
| or else not Container.Content.Nodes (Position.Node).Has_Element |
| then |
| return False; |
| else |
| return True; |
| end if; |
| end Has_Element; |
| |
| --------------- |
| -- Hash_Node -- |
| --------------- |
| |
| function Hash_Node (Node : Node_Type) return Hash_Type is |
| begin |
| return Hash (Node.Key); |
| end Hash_Node; |
| |
| ------------- |
| -- Include -- |
| ------------- |
| |
| procedure Include |
| (Container : in out Map; |
| Key : Key_Type; |
| New_Item : Element_Type) |
| is |
| Position : Cursor; |
| Inserted : Boolean; |
| |
| begin |
| Insert (Container, Key, New_Item, Position, Inserted); |
| |
| if not Inserted then |
| declare |
| N : Node_Type renames Container.Content.Nodes (Position.Node); |
| begin |
| N.Key := Key; |
| N.Element := New_Item; |
| end; |
| end if; |
| end Include; |
| |
| ------------ |
| -- Insert -- |
| ------------ |
| |
| procedure Insert |
| (Container : in out Map; |
| Key : Key_Type; |
| New_Item : Element_Type; |
| Position : out Cursor; |
| Inserted : out Boolean) |
| is |
| procedure Assign_Key (Node : in out Node_Type); |
| pragma Inline (Assign_Key); |
| |
| function New_Node return Count_Type; |
| pragma Inline (New_Node); |
| |
| procedure Local_Insert is |
| new Key_Ops.Generic_Conditional_Insert (New_Node); |
| |
| procedure Allocate is |
| new Generic_Allocate (Assign_Key); |
| |
| ----------------- |
| -- Assign_Key -- |
| ----------------- |
| |
| procedure Assign_Key (Node : in out Node_Type) is |
| begin |
| Node.Key := Key; |
| Node.Element := New_Item; |
| end Assign_Key; |
| |
| -------------- |
| -- New_Node -- |
| -------------- |
| |
| function New_Node return Count_Type is |
| Result : Count_Type; |
| begin |
| Allocate (Container, Result); |
| return Result; |
| end New_Node; |
| |
| -- Start of processing for Insert |
| |
| begin |
| Local_Insert (Container.Content, Key, Position.Node, Inserted); |
| end Insert; |
| |
| procedure Insert |
| (Container : in out Map; |
| Key : Key_Type; |
| New_Item : Element_Type) |
| is |
| Position : Cursor; |
| pragma Unreferenced (Position); |
| |
| Inserted : Boolean; |
| |
| begin |
| Insert (Container, Key, New_Item, Position, Inserted); |
| |
| if not Inserted then |
| raise Constraint_Error with "attempt to insert key already in map"; |
| end if; |
| end Insert; |
| |
| -------------- |
| -- Is_Empty -- |
| -------------- |
| |
| function Is_Empty (Container : Map) return Boolean is |
| begin |
| return Length (Container) = 0; |
| end Is_Empty; |
| |
| --------- |
| -- Key -- |
| --------- |
| |
| function Key (Container : Map; Position : Cursor) return Key_Type is |
| begin |
| if not Has_Element (Container, Position) then |
| raise Constraint_Error with |
| "Position cursor of function Key has no element"; |
| end if; |
| |
| pragma Assert (Vet (Container, Position), "bad cursor in function Key"); |
| |
| return Container.Content.Nodes (Position.Node).Key; |
| end Key; |
| |
| ------------ |
| -- Length -- |
| ------------ |
| |
| function Length (Container : Map) return Count_Type is |
| begin |
| return Container.Content.Length; |
| end Length; |
| |
| ---------- |
| -- Move -- |
| ---------- |
| |
| procedure Move |
| (Target : in out Map; |
| Source : in out Map) |
| is |
| NN : HT_Types.Nodes_Type renames Source.Content.Nodes; |
| X : Count_Type; |
| Y : Count_Type; |
| |
| begin |
| if Target'Address = Source'Address then |
| return; |
| end if; |
| |
| if Target.Capacity < Length (Source) then |
| raise Constraint_Error with -- ??? |
| "Source length exceeds Target capacity"; |
| end if; |
| |
| Clear (Target); |
| |
| if Source.Content.Length = 0 then |
| return; |
| end if; |
| |
| X := HT_Ops.First (Source.Content); |
| while X /= 0 loop |
| Insert (Target, NN (X).Key, NN (X).Element); -- optimize??? |
| |
| Y := HT_Ops.Next (Source.Content, X); |
| |
| HT_Ops.Delete_Node_Sans_Free (Source.Content, X); |
| Free (Source, X); |
| |
| X := Y; |
| end loop; |
| end Move; |
| |
| ---------- |
| -- Next -- |
| ---------- |
| |
| function Next (Node : Node_Type) return Count_Type is |
| begin |
| return Node.Next; |
| end Next; |
| |
| function Next (Container : Map; Position : Cursor) return Cursor is |
| begin |
| if Position.Node = 0 then |
| return No_Element; |
| end if; |
| |
| if not Has_Element (Container, Position) then |
| raise Constraint_Error with "Position has no element"; |
| end if; |
| |
| pragma Assert (Vet (Container, Position), "bad cursor in function Next"); |
| |
| declare |
| Node : constant Count_Type := |
| HT_Ops.Next (Container.Content, Position.Node); |
| |
| begin |
| if Node = 0 then |
| return No_Element; |
| end if; |
| |
| return (Node => Node); |
| end; |
| end Next; |
| |
| procedure Next (Container : Map; Position : in out Cursor) is |
| begin |
| Position := Next (Container, Position); |
| end Next; |
| |
| --------------- |
| -- Reference -- |
| --------------- |
| |
| function Reference |
| (Container : not null access Map; |
| Position : Cursor) return not null access Element_Type |
| is |
| begin |
| if not Has_Element (Container.all, Position) then |
| raise Constraint_Error with "Position cursor has no element"; |
| end if; |
| |
| pragma Assert |
| (Vet (Container.all, Position), "bad cursor in function Reference"); |
| |
| return Container.Content.Nodes (Position.Node).Element'Access; |
| end Reference; |
| |
| function Reference |
| (Container : not null access Map; |
| Key : Key_Type) return not null access Element_Type |
| is |
| Node : constant Count_Type := Find (Container.all, Key).Node; |
| |
| begin |
| if Node = 0 then |
| raise Constraint_Error with |
| "no element available because key not in map"; |
| end if; |
| |
| return Container.Content.Nodes (Node).Element'Access; |
| end Reference; |
| |
| ------------- |
| -- Replace -- |
| ------------- |
| |
| procedure Replace |
| (Container : in out Map; |
| Key : Key_Type; |
| New_Item : Element_Type) |
| is |
| Node : constant Count_Type := Key_Ops.Find (Container.Content, Key); |
| |
| begin |
| if Node = 0 then |
| raise Constraint_Error with "attempt to replace key not in map"; |
| end if; |
| |
| declare |
| N : Node_Type renames Container.Content.Nodes (Node); |
| begin |
| N.Key := Key; |
| N.Element := New_Item; |
| end; |
| end Replace; |
| |
| --------------------- |
| -- Replace_Element -- |
| --------------------- |
| |
| procedure Replace_Element |
| (Container : in out Map; |
| Position : Cursor; |
| New_Item : Element_Type) |
| is |
| begin |
| if not Has_Element (Container, Position) then |
| raise Constraint_Error with |
| "Position cursor of Replace_Element has no element"; |
| end if; |
| |
| pragma Assert |
| (Vet (Container, Position), "bad cursor in Replace_Element"); |
| |
| Container.Content.Nodes (Position.Node).Element := New_Item; |
| end Replace_Element; |
| |
| ---------------------- |
| -- Reserve_Capacity -- |
| ---------------------- |
| |
| procedure Reserve_Capacity |
| (Container : in out Map; |
| Capacity : Count_Type) |
| is |
| begin |
| if Capacity > Container.Capacity then |
| raise Capacity_Error with "requested capacity is too large"; |
| end if; |
| end Reserve_Capacity; |
| |
| -------------- |
| -- Set_Next -- |
| -------------- |
| |
| procedure Set_Next (Node : in out Node_Type; Next : Count_Type) is |
| begin |
| Node.Next := Next; |
| end Set_Next; |
| |
| --------- |
| -- Vet -- |
| --------- |
| |
| function Vet (Container : Map; Position : Cursor) return Boolean is |
| begin |
| if Position.Node = 0 then |
| return True; |
| end if; |
| |
| declare |
| X : Count_Type; |
| |
| begin |
| if Container.Content.Length = 0 then |
| return False; |
| end if; |
| |
| if Container.Capacity = 0 then |
| return False; |
| end if; |
| |
| if Container.Content.Buckets'Length = 0 then |
| return False; |
| end if; |
| |
| if Position.Node > Container.Capacity then |
| return False; |
| end if; |
| |
| if Container.Content.Nodes (Position.Node).Next = Position.Node then |
| return False; |
| end if; |
| |
| X := |
| Container.Content.Buckets |
| (Key_Ops.Index |
| (Container.Content, |
| Container.Content.Nodes (Position.Node).Key)); |
| |
| for J in 1 .. Container.Content.Length loop |
| if X = Position.Node then |
| return True; |
| end if; |
| |
| if X = 0 then |
| return False; |
| end if; |
| |
| if X = Container.Content.Nodes (X).Next then |
| |
| -- Prevent unnecessary looping |
| |
| return False; |
| end if; |
| |
| X := Container.Content.Nodes (X).Next; |
| end loop; |
| |
| return False; |
| end; |
| end Vet; |
| |
| end Ada.Containers.Formal_Hashed_Maps; |
