-- This file is part of a Liberty Eiffel library.
-- See the full copyright at the end.
--
class BACKTRACKING_SEQUENCE_LIST
   --
   -- A sequence of a list of nodes.
   --

inherit
   ABSTRACT_BACKTRACKING_SEQUENCE
      rename pool as pool_of_sequence_list
      end

insert
   BACKTRACKING_GLOBALS

feature {ABSTRACT_BACKTRACKING}
   list: BACKTRACKING_NODE_AND_LIST
         -- Iterator on the next item of the list.

   set_list (value: BACKTRACKING_NODE_AND_LIST)
      require
         value_not_void: value /= Void
      do
         list := value
      ensure
         definition: list = value
         list_not_void: list /= Void
      end

feature {ABSTRACT_BACKTRACKING}
   next_sequence (explorer: BACKTRACKING)
      do
         -- Tell to evaluate 'list.node' now.
         explorer.set_current_node(list.node)
         list := list.next
         if list = Void then
            -- Sequence is off, remove it.
            explorer.pop_sequence
         end
      end

end -- class BACKTRACKING_SEQUENCE_LIST
--
-- Copyright (C) 2009-2017: by all the people cited in the AUTHORS file.
--
-- Permission is hereby granted, free of charge, to any person obtaining a copy
-- of this software and associated documentation files (the "Software"), to deal
-- in the Software without restriction, including without limitation the rights
-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-- copies of the Software, and to permit persons to whom the Software is
-- furnished to do so, subject to the following conditions:
--
-- The above copyright notice and this permission notice shall be included in
-- all copies or substantial portions of the Software.
--
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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-- THE SOFTWARE.