WeakReference

scala.ref.WeakReference
See theWeakReference companion object
class WeakReference[+T <: AnyRef](value: T, queue: ReferenceQueue[T]) extends ReferenceWrapper[T]

A wrapper class for java.lang.ref.WeakReference The new functionality is (1) results are Option values, instead of using null. (2) There is an extractor that maps the weak reference itself into an option.

Attributes

Companion
object
Source
WeakReference.scala
Graph
Supertypes
trait ReferenceWrapper[T]
trait Proxy
trait Reference[T]
trait () => T
class Object
trait Matchable
class Any
Show all

Members list

Value members

Constructors

def this(value: T)

Attributes

Source
WeakReference.scala

Inherited methods

def apply(): T

return the underlying value

return the underlying value

Attributes

Inherited from:
ReferenceWrapper
Source
ReferenceWrapper.scala
def clear(): Unit

Attributes

Inherited from:
ReferenceWrapper
Source
ReferenceWrapper.scala
def enqueue(): Boolean

Attributes

Inherited from:
ReferenceWrapper
Source
ReferenceWrapper.scala
override def equals(that: Any): Boolean

Compares the receiver object (this) with the argument object (that) for equivalence.

Compares the receiver object (this) with the argument object (that) for equivalence.

Any implementation of this method should be an equivalence relation:

- It is reflexive: for any instance x of type Any, x.equals(x) should return true. - It is symmetric: for any instances x and y of type Any, x.equals(y) should return true if and only if y.equals(x) returns true. - It is transitive: for any instances x, y, and z of type Any if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.

If you override this method, you should verify that your implementation remains an equivalence relation. Additionally, when overriding this method it is usually necessary to override hashCode to ensure that objects which are "equal" (o1.equals(o2) returns true) hash to the same scala.Int. (o1.hashCode.equals(o2.hashCode)).

Value parameters

that

the object to compare against this object for equality.

Attributes

Returns

true if the receiver object is equivalent to the argument; false otherwise.

Definition Classes
Proxy -> Any
Inherited from:
Proxy
Source
Proxy.scala
override def get: Option[T]

return Some underlying if it hasn't been collected, otherwise None

return Some underlying if it hasn't been collected, otherwise None

Attributes

Definition Classes
Inherited from:
ReferenceWrapper
Source
ReferenceWrapper.scala
override def hashCode: Int

Calculates a hash code value for the object.

Calculates a hash code value for the object.

The default hashing algorithm is platform dependent.

Note that it is allowed for two objects to have identical hash codes (o1.hashCode.equals(o2.hashCode)) yet not be equal (o1.equals(o2) returns false). A degenerate implementation could always return 0. However, it is required that if two objects are equal (o1.equals(o2) returns true) that they have identical hash codes (o1.hashCode.equals(o2.hashCode)). Therefore, when overriding this method, be sure to verify that the behavior is consistent with the equals method.

Attributes

Returns

the hash code value for this object.

Definition Classes
Proxy -> Any
Inherited from:
Proxy
Source
Proxy.scala

Attributes

Inherited from:
ReferenceWrapper
Source
ReferenceWrapper.scala
def self: Reference[_ <: T]

Attributes

Inherited from:
ReferenceWrapper
Source
ReferenceWrapper.scala
override def toString: String

Returns a string representation of the object.

Returns a string representation of the object.

The default representation is platform dependent.

Attributes

Returns

a string representation of the object.

Definition Classes
Proxy -> Any
Inherited from:
Proxy
Source
Proxy.scala

Concrete fields

val underlying: WeakReference[_ <: T]

Attributes

Source
WeakReference.scala