root/trunk/ProjectFortress/not_passing_yet/conditionalExtension.fss

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component conditionalExtension

export Executable

trait PartialOrderAndBoundedLattice[\T, opr LEOPR, opr MINOPR, opr MAXOPR\] end
trait Identity[\opr PLUS\] end

trait RationalQuantity[\unit U absorbs unit, bool ninf, bool lt, bool eq,
                        bool gt, bool pinf, bool nan\]
    extends {
      RationalQuantity[\U, ninf', lt', eq', gt', pinf', nan'\]
              where [\bool ninf', bool lt', bool eq', bool gt', bool pinf',
                      bool nan' \]
                    { ninf IMPLIES ninf', lt IMPLIES lt',
                      eq IMPLIES eq', gt IMPLIES gt', pinf IMPLIES pinf',
                      nan IMPLIES nan'
                    },
              PartialOrderAndBoundedLattice[\RationalQuantity[\U, ninf, lt, eq, gt, pinf, nan\], <=, MIN, MAX\]
              where { ninf AND pinf AND NOT nan }
            }
    where { ninf OR lt OR eq OR gt OR pinf OR nan }
  coerce(x: Identity[\+\]) = 0
end

run() = println "Conditional extension with where clauses can be parsed."

end