-- This file is part of a Liberty Eiffel library.
-- See the full copyright at the end.
--
deferred class BACKTRACKING_NODE
   --
   -- Parent class of all the nodes that are explored by BACKTRACKING
   --

feature {ANY}
   explore (explorer: BACKTRACKING)
         -- That feature must update the state of 'explorer'.
      deferred
      end

end -- class BACKTRACKING_NODE
--
-- Copyright (C) 2009-2017: by all the people cited in the AUTHORS file.
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-- copies of the Software, and to permit persons to whom the Software is
-- furnished to do so, subject to the following conditions:
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-- The above copyright notice and this permission notice shall be included in
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