You can hypothetically convert a BindingSeq[A] into a Binding[Iterable[A]] with the <c

I've come up with a slightly more elegant solution: <div class="highlight highligh

I've created a separate issue for the implicit value class error: <a class="issue-link

vars.all.bind was fixed in <a class="issue-link js-i

Conversion from Binding[Iterable[A]] to BindingSeq[A] about binding.scala HOT 4 CLOSED

Axiometry commented on June 12, 2024

Conversion from Binding[Iterable[A]] to BindingSeq[A]

from binding.scala.

Comments (4)

Axiometry commented on June 12, 2024

I've come up with a slightly more elegant solution:

def bindingSeq[A](seqInBinding: Binding[Iterable[A]]): BindingSeq[A] =
  Constants(Binding(Constants(seqInBinding.bind.toSeq: _*))).flatMap(_.bind)

(and for related conversions:)

def bindingSeq[A](seqOfBinding: Iterable[Binding[A]]): Binding[Iterable[A]] =
  Constants(seqOfBinding.toSeq: _*).map(_.bind).all
def bindingSeq[A](seqOfBinding: Iterable[Binding[A]]): BindingSeq[A] =
  Constants(seqOfBinding.toSeq: _*).map(_.bind)

Feel free to close this if employing Constants in this way is the most idiomatic method.

Note that this still doesn't work when positioned in an implicit value class:

implicit class Wrapper[A](val seqInBinding: Binding[Iterable[A]]) extends AnyVal {
  def bindingSeq: BindingSeq[A] =
    Constants(Binding(Constants(seqInBinding.bind.toSeq: _*))).flatMap(_.bind)
}

Could not find proxy for x$4: binding.this.Binding in List(value x$4, value $anonfun, method bindingSeq, class Wrapper, module class ScalaFiddle, package class , package class ) (currentOwner= value $anonfun )

Though this can be worked around by defining the body of bindingSeq elsewhere and calling it from within the implicit value class:

object Conversions {
  def toBindingSeq[A](data: Binding[Iterable[A]]): BindingSeq[A] =
    Constants(Binding(Constants(data.bind.toSeq: _*))).flatMap(_.bind)
}
implicit class Wrapper[A](val seqInBinding: Binding[Iterable[A]]) extends AnyVal {
  def bindingSeq: BindingSeq[A] = Conversions.toBindingSeq(seqInBinding)
}