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- the server-side interface to a weak object.
This interface is proxy to the adapted object.
In order to make it possible to have weak references to objects,
the XAdapter interface must be implemented to provide
a weak adapter for the clients.
Concept of weak referencing:
This module specifies the interfaces for implementing and using
The sense of weak references is to hold a reference to an object
without affecting the lifetime of the object. That means that a weak
reference may become invalid, at any time, if the referenced object dies.
The following interfaces describe one way to handle weak references
by providing a weak adapter. The weak object has to provide this
adapter if anyone wants to hold a weak reference. To separate their
lifetimes, the adapter and the original object must not share the same
reference counter. The weak reference is in fact only a hard reference
to the adapter, which knows - but does not hold - the original object.
That means that the implementation and synchronization of weak
referencing is the responsibility of the object. The following
interfaces are involved in the concept of weak referencing:
- is the server-side interface of the referred object. This
referred object must support the XAdapter interface.
- is a client-side interface which must be implemented by
the holder of any weak reference. It is used for notification
when the adapted object dies.
- Developers Guide
- ProUNO - Lifetime of UNO objects
- WritingUNO - XWeak
- ProUNO - C++ - Using Weak References
- WritingUNO - Core Interfaces to Implement
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- queries the weak adapter.
It is important that the adapter must know, but not hold
the adapted object. If the adapted object dies, all references
to the adapter have to be notified to release the adapter.
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