scala-macros

问题 I don't even know how to ask the question. I have a macro that creates an instance of IsEnum[T] for a type T . I'm doing testing for it, and want to make sure that the implicit is not found for types that are not sealed, or that, in general, don't meet the requirements of an enum. So I created this method for testing def enumOf[T](implicit isEnum:IsEnum[T] = null) = isEnum And then I ensure that enumOf[NotAnEnum] == null But instead, it fails at compile time. One thing is the macro erroring.

问题 I have a trait Foo[T, U] and a type-level algorithm that given an L <: HList and a target type U , tells me whether there exists T in L such that there is an implicit Foo[T, U] in scope. This is implemented using the following type class: trait Search[L <: HList, U] object Search { def apply[L <: HList, U](implicit s: Search[L, U]): U = null ... } and we have the following: object Test { type L = Int :: String :: HNil implicit val foo: Foo[String, Boolean] = null Search[L, Boolean] //compiles

来源： https://stackoverflow.com/questions/64519009/how-to-recognize-an-anonymous-class-in-a-scala-macro

来源： https://stackoverflow.com/questions/64519009/how-to-recognize-an-anonymous-class-in-a-scala-macro

来源： https://stackoverflow.com/questions/64519009/how-to-recognize-an-anonymous-class-in-a-scala-macro

来源： https://stackoverflow.com/questions/56935330/scala-what-can-code-in-context-eval-reference

来源： https://stackoverflow.com/questions/56935330/scala-what-can-code-in-context-eval-reference

来源： https://stackoverflow.com/questions/56935330/scala-what-can-code-in-context-eval-reference

来源： https://stackoverflow.com/questions/61949890/generate-apply-methods-creating-a-class

来源： https://stackoverflow.com/questions/61949890/generate-apply-methods-creating-a-class