final class OptRef[+A >: Null] extends AnyVal with Serializable

Like Opt but has better Java interop thanks to the fact that wrapped value has type A instead of Any. For example, Scala method defined like this:

def takeMaybeString(str: OptRef[String]): Unit

will be seen by Java as:

public void takeMaybeString(String str);

and null will be used to represent absence of value.

This comes at the cost of A having to be a nullable type. Also, empty value is represented internally using null which unfortunately makes OptRef suffer from SI-7396 (hashCode fails on OptRef.Empty which means that you can't add OptRef values into hash sets or use them as hash map keys).

Author: ghik Created: 07/01/16.

Linear Supertypes
Serializable, Serializable, AnyVal, Any
Ordering
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  2. By Inheritance
Inherited
  1. OptRef
  2. Serializable
  3. Serializable
  4. AnyVal
  5. Any
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Visibility
  1. Public
  2. All

Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    Any
  2. final def ##(): Int
    Definition Classes
    Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    Any
  4. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  5. def collect[B >: Null](pf: PartialFunction[A, B]): OptRef[B]
    Annotations
    @inline()
  6. def contains[A1 >: A](elem: A1): Boolean
    Annotations
    @inline()
  7. def exists(p: (A) ⇒ Boolean): Boolean
    Annotations
    @inline()
  8. def filter(p: (A) ⇒ Boolean): OptRef[A]
    Annotations
    @inline()
  9. def filterNot(p: (A) ⇒ Boolean): OptRef[A]
    Annotations
    @inline()
  10. def flatMap[B >: Null](f: (A) ⇒ OptRef[B]): OptRef[B]
    Annotations
    @inline()
  11. def fold[B >: Null](ifEmpty: ⇒ B)(f: (A) ⇒ B): B
    Annotations
    @inline()
  12. def forall(p: (A) ⇒ Boolean): Boolean
    Annotations
    @inline()
  13. def foreach[U](f: (A) ⇒ U): Unit
    Annotations
    @inline()
  14. def get: A
    Annotations
    @inline()
  15. def getClass(): Class[_ <: AnyVal]
    Definition Classes
    AnyVal → Any
  16. def getOrElse[B >: A](default: ⇒ B): B
    Annotations
    @inline()
  17. def isDefined: Boolean
    Annotations
    @inline()
  18. def isEmpty: Boolean
    Annotations
    @inline()
  19. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  20. def iterator: Iterator[A]
    Annotations
    @inline()
  21. def map[B >: Null](f: (A) ⇒ B): OptRef[B]
    Annotations
    @inline()
  22. def nonEmpty: Boolean
    Annotations
    @inline()
  23. def orElse[B >: A](alternative: ⇒ OptRef[B]): OptRef[B]
    Annotations
    @inline()
  24. def orNull[B >: A](implicit ev: <:<[Null, B]): B
    Annotations
    @inline()
  25. def toLeft[X](right: ⇒ X): Either[A, X]
    Annotations
    @inline()
  26. def toList: List[A]
    Annotations
    @inline()
  27. def toOpt: Opt[A]
    Annotations
    @inline()
  28. def toOption: Option[A]
    Annotations
    @inline()
  29. def toRight[X](left: ⇒ X): Either[X, A]
    Annotations
    @inline()
  30. def toString(): String
    Definition Classes
    OptRef → Any
  31. def withFilter(p: (A) ⇒ Boolean): WithFilter[A]
    Annotations
    @inline()

Inherited from Serializable

Inherited from Serializable

Inherited from AnyVal

Inherited from Any

Ungrouped