Optional
decrel.Relation$.Composed$.Optional
case class Optional[LeftTree, LeftIn, LeftOut, RightTree, RightIn, RightOut](left: LeftTree, right: RightTree)(implicit composeOneEv: LeftOut <:< RightIn, leftRel: LeftTree <:< Optional[LeftIn, LeftOut], rightRel: RightTree <:< Relation[RightIn, RightOut]) extends Composed[LeftTree, LeftIn, LeftOut, RightTree, RightIn, RightOut, Option[RightOut]]
Attributes
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