--  Copyright 2001-2002 Simon Wright <simon@pushface.org>

--  This package is free software; you can redistribute it and/or
--  modify it under terms of the GNU General Public License as
--  published by the Free Software Foundation; either version 2, or
--  (at your option) any later version. This package is distributed in
--  the hope that it will be useful, but WITHOUT ANY WARRANTY; without
--  even the implied warranty of MERCHANTABILITY or FITNESS FOR A
--  PARTICULAR PURPOSE. See the GNU General Public License for more
--  details. You should have received a copy of the GNU General Public
--  License distributed with this package; see file COPYING.  If not,
--  write to the Free Software Foundation, 59 Temple Place - Suite
--  330, Boston, MA 02111-1307, USA.

--  As a special exception, if other files instantiate generics from
--  this unit, or you link this unit with other files to produce an
--  executable, this unit does not by itself cause the resulting
--  executable to be covered by the GNU General Public License.  This
--  exception does not however invalidate any other reasons why the
--  executable file might be covered by the GNU Public License.

--  $RCSfile: bc-filter.adb,v $
--  $Revision: 1.5.2.1 $
--  $Date: 2002/12/26 11:43:52 $
--  $Author: simon $

procedure BC.Filter (Input : From; Output : in out To) is
   It : Source.Iterator'Class := New_Iterator (Input);
begin
   Clear (Output);
   while not Source.Is_Done (It) loop
      declare
         I : constant Item := Source.Current_Item (It);
      begin
         if Pass (I) then
            Add (Output, I);
         end if;
      end;
      Source.Next (It);
   end loop;
end BC.Filter;