[英]How to access to generic class field via scala-reflect and TypeTag (Scala 2.10)
I am trying to check if a field exists in a generic class. 我正在尝试检查通用类中是否存在字段。
import scala.reflect.runtime.{universe => ru}
class Example[T:ru.TypeTag](val value:T)
object Example {
def apply[T:ru.TypeTag](value:T, fieldName: String) : Example[T] = {
val t = ru.typeOf[T]
val hasField: Boolean = ??? // HOW CAN I CHECK THAT class T has the field with name fieldName?
if(hasField)
new Example(value)
else
throw new RuntimeException()
}
}
case class Foo(field:String)
object Test{
Example(Foo("hola"), "field") // WILL WORK
Example(Foo("hola"), "other") // THROWS EXCEPTION
}
How can I implement this?? 我该如何实现呢?
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