object FunctionK extends FunctionKMacroMethods with Serializable
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- FunctionK.scala
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- abstract type τ[F[_], G[_]]
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- FunctionKMacroMethods
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- def id[F[_]]: FunctionK[F, F]
The identity transformation of
F
toF
- final def isInstanceOf[T0]: Boolean
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- macro def lift[F[_], G[_]](f: (F[α]) => G[α] forSome {type α}): FunctionK[F, G]
Lifts function
f
ofF[A] => G[A]
into aFunctionK[F, G]
.Lifts function
f
ofF[A] => G[A]
into aFunctionK[F, G]
.def headOption[A](list: List[A]): Option[A] = list.headOption val lifted: FunctionK[List, Option] = FunctionK.lift(headOption)
Note: This method has a macro implementation that returns a new
FunctionK
instance as follows:new FunctionK[F, G] { def apply[A](fa: F[A]): G[A] = f(fa) }
Additionally, the type parameters on
f
must not be specified.- Definition Classes
- FunctionKMacroMethods
- def liftFunction[F[_], G[_]](f: (F[τ[F, G]]) => G[τ[F, G]]): FunctionK[F, G]
Lifts function
f
ofF[A] => G[A]
into aFunctionK[F, G]
.Lifts function
f
ofF[A] => G[A]
into aFunctionK[F, G]
.def headOption[A](list: List[A]): Option[A] = list.headOption val lifted = FunctionK.liftFunction[List, Option](headOption)
Note: The weird
τ[F, G]
parameter is there to compensate for the lack of polymorphic function types in Scala 2.- Definition Classes
- FunctionKMacroMethods
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