scalaz.syntax.MonadPlusSyntax.scala Maven / Gradle / Ivy

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package scalaz
package syntax

/** Wraps a value `self` and provides methods related to `MonadPlus` */
final class MonadPlusOps[F[_],A] private[syntax](val self: F[A])(implicit val F: MonadPlus[F]) extends Ops[F[A]] {
  ////
  import Leibniz.===

  def filter(f: A => Boolean) =
    F.filter(self)(f)
  
  def withFilter(f: A => Boolean) =
    filter(f)

  final def uniteU[T](implicit T: Unapply[Foldable, A]): F[T.A] =
    F.uniteU(self)(T)

  def unite[T[_], B](implicit ev: A === T[B], T: Foldable[T]): F[B] = {
    val ftb: F[T[B]] = ev.subst(self)
    F.unite[T, B](ftb)
  }

  final def separate[G[_, _], B, C](implicit ev: A === G[B, C], G: Bifoldable[G]): (F[B], F[C]) =
    F.separate(ev.subst(self))

  ////
}

sealed trait ToMonadPlusOps0 {
  implicit def ToMonadPlusOpsUnapply[FA](v: FA)(implicit F0: Unapply[MonadPlus, FA]) =
    new MonadPlusOps[F0.M,F0.A](F0(v))(F0.TC)

}

trait ToMonadPlusOps extends ToMonadPlusOps0 with ToMonadOps with ToApplicativePlusOps {
  implicit def ToMonadPlusOps[F[_],A](v: F[A])(implicit F0: MonadPlus[F]) =
    new MonadPlusOps[F,A](v)

  ////

  ////
}

trait MonadPlusSyntax[F[_]] extends MonadSyntax[F] with ApplicativePlusSyntax[F] {
  implicit def ToMonadPlusOps[A](v: F[A]): MonadPlusOps[F, A] = new MonadPlusOps[F,A](v)(MonadPlusSyntax.this.F)

  def F: MonadPlus[F]
  ////

  ////
}