Skip to content

Rewrite to method as an extension method #135

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
mpilquist wants to merge 2 commits into
base: main
Choose a base branch
from
Open

Rewrite to method as an extension method #135

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
87eac9c
Rewrite to method as an extension method
mpilquist Dec 15, 2025
e156807
Typo
mpilquist Dec 15, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
15 changes: 14 additions & 1 deletion core/shared/src/main/scala-3/org/typelevel/twiddles/Twiddles.scala
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -32,15 +32,27 @@ package org.typelevel.twiddles

import cats.{Invariant, InvariantSemigroupal}
import cats.syntax.all._
import scala.compiletime.summonInline

trait TwiddleSyntax[F[_]]:

implicit def toTwiddleOpCons[B <: Tuple](fb: F[B]): TwiddleOpCons[F, B] = new TwiddleOpCons(
fb
)

implicit def toTwiddleOpTwo[B](fb: F[B]): TwiddleOpTwo[F, B] = new TwiddleOpTwo(fb)

implicit def toTwiddleOpTo[A](fa: F[A]): TwiddleOpTo[F, A] = new TwiddleOpTo(fa)
extension [A](fa: F[A])
inline def to[B]: F[B] =
// Note: defining these as context params results in inference issues
// See https://github.com/typelevel/twiddles/issues/19 and fix
// https://github.com/typelevel/twiddles/issues/10#issuecomment-2833403842
val iso = summonInline[Iso[A, B]]
val F = summonInline[Invariant[F]]
F.imap(fa)(iso.to)(iso.from)

@deprecated("1.0", "No longer needed")
def toTwiddleOpTo[A](fa: F[A]): TwiddleOpTo[F, A] = new TwiddleOpTo(fa)

extension [A <: Tuple](fa: F[A])
inline def dropUnits(using Invariant[F]): F[DropUnits[A]] =
Expand Down Expand Up @@ -87,5 +99,6 @@ final class TwiddleOpTwo[F[_], B](private val self: F[B]) extends AnyVal:
case a *: b *: EmptyTuple => (a, b)
}

@deprecated("1.0", "No longer needed")
final class TwiddleOpTo[F[_], A](private val self: F[A]) extends AnyVal:
def to[B](implicit iso: Iso[A, B], F: Invariant[F]): F[B] = self.imap(iso.to)(iso.from)