WeakRefRef
public struct WeakRefRef : WeakRefProtocol
A structure containing a weak reference to a GObject
.
A GWeakRef
can either be empty (i.e. point to nil
), or point to an
object for as long as at least one “strong” reference to that object
exists. Before the object’s GObjectClass.dispose
method is called,
every GWeakRef
associated with becomes empty (i.e. points to nil
).
Like GValue
, GWeakRef
can be statically allocated, stack- or
heap-allocated, or embedded in larger structures.
Unlike g_object_weak_ref()
and g_object_add_weak_pointer()
, this weak
reference is thread-safe: converting a weak pointer to a reference is
atomic with respect to invalidation of weak pointers to destroyed
objects.
If the object’s GObjectClass.dispose
method results in additional
references to the object being held (‘re-referencing’), any GWeakRefs
taken
before it was disposed will continue to point to nil
. Any GWeakRefs
taken
during disposal and after re-referencing, or after disposal has returned due
to the re-referencing, will continue to point to the object until its refcount
goes back to zero, at which point they too will be invalidated.
It is invalid to take a GWeakRef
on an object during GObjectClass.dispose
without first having or creating a strong reference to the object.
The WeakRefRef
type acts as a lightweight Swift reference to an underlying GWeakRef
instance.
It exposes methods that can operate on this data type through WeakRefProtocol
conformance.
Use WeakRefRef
only as an unowned
reference to an existing GWeakRef
instance.
-
Untyped pointer to the underlying `GWeakRef` instance.
For type-safe access, use the generated, typed pointer
_ptr
property instead.Declaration
Swift
public let ptr: UnsafeMutableRawPointer!
-
Designated initialiser from the underlying
C
data typeDeclaration
Swift
@inlinable init(_ p: UnsafeMutablePointer<GWeakRef>)
-
Designated initialiser from a constant pointer to the underlying
C
data typeDeclaration
Swift
@inlinable init(_ p: UnsafePointer<GWeakRef>)
-
Conditional initialiser from an optional pointer to the underlying
C
data typeDeclaration
Swift
@inlinable init!(_ maybePointer: UnsafeMutablePointer<GWeakRef>?)
-
Conditional initialiser from an optional, non-mutable pointer to the underlying
C
data typeDeclaration
Swift
@inlinable init!(_ maybePointer: UnsafePointer<GWeakRef>?)
-
Conditional initialiser from an optional
gpointer
Declaration
Swift
@inlinable init!(gpointer g: gpointer?)
-
Conditional initialiser from an optional, non-mutable
gconstpointer
Declaration
Swift
@inlinable init!(gconstpointer g: gconstpointer?)
-
Reference intialiser for a related type that implements
WeakRefProtocol
Declaration
Swift
@inlinable init<T>(_ other: T) where T : WeakRefProtocol
-
Unsafe typed initialiser. Do not use unless you know the underlying data type the pointer points to conforms to
WeakRefProtocol
.Declaration
Swift
@inlinable init<T>(cPointer: UnsafeMutablePointer<T>)
-
Unsafe typed initialiser. Do not use unless you know the underlying data type the pointer points to conforms to
WeakRefProtocol
.Declaration
Swift
@inlinable init<T>(constPointer: UnsafePointer<T>)
-
Unsafe untyped initialiser. Do not use unless you know the underlying data type the pointer points to conforms to
WeakRefProtocol
.Declaration
Swift
@inlinable init(mutating raw: UnsafeRawPointer)
-
Unsafe untyped initialiser. Do not use unless you know the underlying data type the pointer points to conforms to
WeakRefProtocol
.Declaration
Swift
@inlinable init(raw: UnsafeMutableRawPointer)
-
Unsafe untyped initialiser. Do not use unless you know the underlying data type the pointer points to conforms to
WeakRefProtocol
.Declaration
Swift
@inlinable init(opaquePointer: OpaquePointer)