scala-reflect

来源： https://stackoverflow.com/questions/64111895/dynamically-parse-json-in-flink-map

来源： https://stackoverflow.com/questions/63299269/in-scala-is-it-possible-to-instantiate-an-object-of-generic-type-t

来源： https://stackoverflow.com/questions/63299269/in-scala-is-it-possible-to-instantiate-an-object-of-generic-type-t

来源： https://stackoverflow.com/questions/64002546/is-there-some-way-in-scala-that-i-can-return-a-type

来源： https://stackoverflow.com/questions/64002546/is-there-some-way-in-scala-that-i-can-return-a-type

来源： https://stackoverflow.com/questions/64002546/is-there-some-way-in-scala-that-i-can-return-a-type

问题 In scala language, implicit resolution is often done in compile-time and sometimes throws obfuscating error information, one famous example of such error is when shapeless Generic throws error information like: error: could not find implicit value for parameter encoder: CsvEncoder[Foo] (see https://books.underscore.io/shapeless-guide/shapeless-guide.html for detail) A solution to this problem is to run implicit resolution algorithm (should be a graph query algorithm internally) in runtime,

问题 In this post: Is it possible to convert a TypeTag to a Manifest? It is indicated that a TypeTag can be converted into a Manifest using the following code: def toManifest[T:TypeTag]: Manifest[T] = { val t = typeTag[T] val mirror = t.mirror def toManifestRec(t: Type): Manifest[_] = { val clazz = ClassTag[T](mirror.runtimeClass(t)).runtimeClass if (t.typeArgs.length == 1) { val arg = toManifestRec(t.typeArgs.head) ManifestFactory.classType(clazz, arg) } else if (t.typeArgs.length > 1) { val args

问题 I want to pass a scala file containing a case class so my application compiles this case class during run time and start using it. The main reason why I am doing this is because I want to avoid rebuilding my code every time the case class changes. So would be better to pass it as a parameter (in case you are wondered, the operations with this case class are generic so it is not required any rework in the transformations) I was using these post1, post2 and post3 as references. So far my

问题 I want to pass a scala file containing a case class so my application compiles this case class during run time and start using it. The main reason why I am doing this is because I want to avoid rebuilding my code every time the case class changes. So would be better to pass it as a parameter (in case you are wondered, the operations with this case class are generic so it is not required any rework in the transformations) I was using these post1, post2 and post3 as references. So far my