WeakRef is a class to represent a reference to an object that is not seen by the tracing phase of the garbage collector. This allows the referenced object to be garbage collected as if nothing is referring to it. Because WeakRef delegates method calls to the referenced object, it may be used in place of that object, i.e. it is of the same duck type.
Usage:
foo = Object.new foo = Object.new p foo.to_s # original's class foo = WeakRef.new(foo) p foo.to_s # should be same class ObjectSpace.garbage_collect p foo.to_s # should raise exception (recycled)
Classes & Modules
Methods
Class
| Visibility | Signature |
|---|---|
| public | new (orig) |
Instance
| Visibility | Signature |
|---|---|
| public | __getobj__ () |
| public | __setobj__ (obj) |
| public | weakref_alive? () |
Class Method Detail
new(orig)
Instance Method Detail
__getobj__()
Return the object this WeakRef references. Raises RefError if the object has been garbage collected. The object returned is the object to which method calls are delegated (see Delegator).
__setobj__(obj)
weakref_alive?()
Returns true if the referenced object still exists, and false if it has been garbage collected.