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Decrements the reference count for the calling interface on an object. If the reference count on the object falls to zero, the object is freed from memory.
ULONG Release(void);
Return Values
Returns the resulting value of the reference count, which is used for diagnostic/testing purposes only. If you need to know that resources have been freed, use an interface with higher-level semantics.
Remarks
This member function implements the IUnknown::Releasemethod.