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Obtain the class type of a generic type at runtime / published by https://github.com/dacr/code-examples-manager #62dcc5ac-2855-454b-9350-0f9c1e98c2fb/c4395dffdeba34d1ab51f5a241be0c9237cf457d
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| // summary : Obtain the class type of a generic type at runtime | |
| // keywords : scala, language-feature, class, classtag, generics, reflect, @testable | |
| // publish : gist | |
| // authors : David Crosson | |
| // license : Apache NON-AI License Version 2.0 (https://raw.githubusercontent.com/non-ai-licenses/non-ai-licenses/main/NON-AI-APACHE2) | |
| // id : 62dcc5ac-2855-454b-9350-0f9c1e98c2fb | |
| // created-on : 2022-01-22T08:18:18+01:00 | |
| // managed-by : https://github.com/dacr/code-examples-manager | |
| // run-with : scala-cli $file | |
| // --------------------- | |
| //> using scala "3.4.2" | |
| // --------------------- | |
| import scala.reflect.ClassTag | |
| // Won't compile | |
| // def checkKO[T](): Option[T] = | |
| // println(classOf[T].getCanonicalName) | |
| // None | |
| def check[T]()(implicit tag: ClassTag[T]): Option[T] = | |
| val genericTypeClass = tag.runtimeClass.asInstanceOf[Class[T]] | |
| println(genericTypeClass.getCanonicalName) | |
| None | |
| case class Bidule(name: String) | |
| check[String]() | |
| check[Double]() | |
| check[Bidule]() | |
| check[java.awt.Image]() |
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