-- This file is part of Liberty Eiffel.
--
-- Liberty Eiffel is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, version 3 of the License.
--
-- Liberty Eiffel 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
-- along with Liberty Eiffel.  If not, see <http://www.gnu.org/licenses/>.
--
deferred class LIBERTY_ASSIGNMENT

inherit
   LIBERTY_INSTRUCTION

feature {ANY}
   writable: LIBERTY_WRITABLE
   expression: LIBERTY_EXPRESSION

feature {LIBERTY_REACHABLE, LIBERTY_REACHABLE_COLLECTION_MARKER}
   mark_reachable_code (mark: INTEGER) is
      do
         writable.mark_reachable_code(mark)
         expression.mark_reachable_code(mark)
      end

feature {}
   make (a_writable: like writable; a_expression: like expression; a_position: like position) is
      require
         a_writable /= Void
         a_expression /= Void
         a_position /= Void
      do
         writable := a_writable
         expression := a_expression
         position := a_position
      ensure
         writable = a_writable
         expression = a_expression
         position = a_position
      end

invariant
   writable /= Void
   expression /= Void

end