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
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Members list

Value members

Constructors

Attributes

Source: WeakReference.scala

Inherited methods

return the underlying value

Attributes

Inherited from:: ReferenceWrapper
Source: ReferenceWrapper.scala

Attributes

Inherited from:: ReferenceWrapper
Source: ReferenceWrapper.scala

Attributes

Inherited from:: ReferenceWrapper
Source: ReferenceWrapper.scala

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

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

Attributes

Definition Classes: ReferenceWrapper -> Reference
Inherited from:: ReferenceWrapper
Source: ReferenceWrapper.scala

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.