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• NoneConstraint.scala

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scalax.collection.constrained.constraints.NoneConstraint.scala Maven / Gradle / Ivy

package scalax.collection.constrained
package constraints

import scala.language.higherKinds

import scalax.collection.GraphPredef._

/** The empty constraint treating any addition or subtraction as valid.
  */
class NoneConstraint[N, E[X] <: EdgeLikeIn[X], G <: Graph[N, E]](override val self: G)
    extends Constraint[N, E, G](self) {
  import PreCheckFollowUp.Complete
  override def preAdd(node: N)                                = PreCheckResult(Complete)
  override def preAdd(edge: E[N])                             = PreCheckResult(Complete)
  override def preSubtract(node: self.NodeT, forced: Boolean) = PreCheckResult(Complete)
  override def preSubtract(edge: self.EdgeT, forced: Boolean) = PreCheckResult(Complete)
}
object NoneConstraint extends ConstraintCompanion[NoneConstraint] {
  def apply[N, E[X] <: EdgeLikeIn[X], G <: Graph[N, E]](self: G) = new NoneConstraint[N, E, G](self)
}