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HI09: This example demonstrates how FunnelWeb can be used to create generics
      in languages that do not already provide them.

@! We have to set the output line length limit up to cater for Barry Dwyer's
@! rather horizontal coding style.
@p maximum_output_line_length = 100

@O@<hi09.out@>==@{
@<Generic Set Module@>@(NaryTree@,NaryTreeSet@)
@}

@$@<Generic Set Module@>@(@2@)==@{@-
@! @1 is the base type, @2 is the set type.
[inherit ('@1'), environment ('@2')]

module @2;

type  @2 = ^@2Record;
      @2Record = record
         Member: @1;
         Next: @2;
         end;

procedure Null@2 (var Result: @2);
begin new (Result);
Result^.Member := (- MaxInt)::@1;
Result^.Next := nil end;

function IsNull@2 (S: @2): boolean;
begin IsNull@2 := S^.Member::integer = - MaxInt end;

procedure ForEach@1 (S: @2; procedure DoIt (i: @1));
var   ThisS, NextS: @2;
begin ThisS := S;
while ThisS^.Member::integer <> - MaxInt do
   begin NextS := ThisS^.Next;
   DoIt (ThisS^.Member);
   ThisS := NextS end;
end;

function First@1 (S: @2): @1;
begin First@1 := S^.Member end;

function Is@1InSet (i: @1; S: @2): boolean;
   procedure TestEquals (j: @1);
   begin if Equal@1 (i, j) then Is@1InSet := true; end;
begin Is@1InSet := false; ForEach@1 (S, TestEquals); end;

function Includes@2 (S1, S2: @2): boolean;
var Result: boolean;
   procedure TestIfInS1 (i: @1);
   begin if Result then if not Is@1InSet (i, S1) then Result := false; end;
begin Result := true;
ForEach@1 (S2, TestIfInS1);
Includes@2 := Result end;

function Disjoint@2s (S1, S2: @2): boolean;
var Result: boolean;
   procedure TestIfInS1 (i: @1);
   begin if Result then if Is@1InSet (i, S1) then Result := false; end;
begin Result := true;
ForEach@1 (S2, TestIfInS1);
Disjoint@2s := Result end;

function Equal@2 (S1, S2: @2): boolean;
begin
Equal@2 := Includes@2 (S1, S2) and Includes@2 (S2, S1);
end;

procedure Insert@1 (i: @1; var S: @2);
var   This, Pred, Succ: @2;
begin
if not Is@1InSet (i, S) then
   begin
   Pred := nil; Succ := S;
   while Succ^.Member::integer > i::integer do begin
      Pred := Succ; Succ := Succ^.Next end;
   if Succ^.Member::integer < i::integer then begin
      new (This); This^.Next := Succ; This^.Member := i;
      if Pred <> nil then Pred^.Next := This else S := This;
      end;
   end;
end;

procedure Insert@1s (S1: @2; var S2: @2);
var   This, Pred, Succ: @2;
   procedure Add@1 (i: @1);
   begin Insert@1 (i, S2) end;
begin
ForEach@1 (S1, Add@1);
end;

procedure Remove@1 (i: @1; var S: @2);
var   Pred, This: @2;
begin
Pred := nil; This := S;
while not Equal@1 (This^.Member, i) do begin
   Pred := This; This := This^.Next end;
if Pred <> nil then Pred^.Next := This^.Next else S := This^.Next;
Dispose (This);
end;

procedure Dispose@2 (var S: @2);
var   Old: @2;
begin
while S <> nil do begin Old := S; S := S^.Next; Dispose (Old) end;
end;

end.
@}