WeakRef Class

Article
07/11/2012

Represents a weak reference that can be used by only the Windows Runtime, not classic COM. A weak reference represents an object that might or might not be accessible.

class WeakRef : public ComPtr<IWeakReference>

Remarks

A WeakRef object maintains a strong reference, which is associated with an object, and can be valid or invalid. Call the As() or AsIID() method to obtain a strong reference. When the strong reference is valid, it can access the associated object. When the strong reference is invalid (nullptr), the associated object is inaccessible.

A WeakRef object is typically used to represent an object whose existence is controlled by an external thread or application. For example, construct a WeakRef object from a reference to a file object. While the file is open, the strong reference is valid. But if the file is closed, the strong reference becomes invalid.

Members

Public Constructors

Name	Description
WeakRef::WeakRef Constructor	Initializes a new instance of the WeakRef class.
WeakRef::~WeakRef Destructor	Deinitializes the current instance of the WeakRef class.

Public Methods

Name	Description
WeakRef::As Method	Sets the specified ComPtr pointer parameter to represent the specified interface.
WeakRef::AsIID Method	Sets the specified ComPtr pointer parameter to represent the specified interface ID.
WeakRef::CopyTo Method	Assigns a pointer to an interface, if available, to the specified pointer variable.

Public Operators

Name	Description
WeakRef::operator& Operator	Returns a ComPtrRef object that represents the current WeakRef object.

Inheritance Hierarchy

ComPtr

WeakRef

Requirements

Header: client.h

Namespace: Microsoft::WRL

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