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• Selectable.scala

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scala.Selectable.scala Maven / Gradle / Ivy

package scala

/** A marker trait for objects that support structural selection via
 *  `selectDynamic` and `applyDynamic`
 *
 *  Implementation classes should define, or make available as extension
 *  methods, the following two method signatures:
 *
 *    def selectDynamic(name: String): Any
 *    def applyDynamic(name: String)(args: Any*): Any =
 *
 *  `selectDynamic` is invoked for simple selections `v.m`, whereas
 *  `applyDynamic` is invoked for selections with arguments `v.m(...)`.
 *  If there's only one kind of selection, the method supporting the
 *  other may be omitted. The `applyDynamic` can also have a second parameter
 *  list of class tag arguments, i.e. it may alternatively have the signature
 *
 *    def applyDynamic(name: String, paramClasses: ClassTag[_]*)(args: Any*): Any
 *
 *  In this case the call will synthesize `ClassTag` arguments for all formal parameter
 *  types of the method in the structural type.
 */
trait Selectable extends Any

object Selectable:
  /* Scala 2 compat + allowing for cross-compilation:
   * enable scala.reflect.Selectable.reflectiveSelectable when there is an
   * import scala.language.reflectiveCalls in scope.
   */
  @deprecated(
    "import scala.reflect.Selectable.reflectiveSelectable instead of scala.language.reflectiveCalls",
    since = "3.0")
  implicit def reflectiveSelectableFromLangReflectiveCalls(x: Any)(
      using scala.languageFeature.reflectiveCalls): scala.reflect.Selectable =
    scala.reflect.Selectable.reflectiveSelectable(x)