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Anti-monikers
OLE provides an implementation of a special type of moniker called an anti-moniker. You use this moniker in the creation of new moniker classes. You use it as
the inverse of the moniker that it is composed onto, effectively canceling that
moniker, in much the same way that the ".." operator moves up a directory level
in a file system command.
It is necessary to have an anti-moniker available, because once a composite
moniker is created, it is not possible to delete parts of the moniker if, for
example, an object moves. Instead, you use an anti-moniker to remove one or more
entries from a composite moniker.
Anti-monikers are a moniker class explicitly intended for use as an inverse.
COM defines an API function named CreateAntiMoniker, which returns an anti-moniker. You generally use this function to implement
the IMoniker::Inverse method.
An anti-moniker is only an inverse for those types of monikers that are implemented to treat
anti-monikers as an inverse. For example, if you want to remove the last piece of a
composite moniker, you should not create an anti-moniker and compose it to the end
of the composite. You cannot be sure that the last piece of the composite
considers an anti-moniker to be its inverse. Instead, you should call IMoniker::Enum on the composite moniker, specifying FALSE as the first parameter. This creates an enumerator that returns the component
monikers in reverse order. Use the enumerator to retrieve the last piece of
the composite, and call IMoniker::Inverse on that moniker. The moniker returned by IMoniker::Inverse is what you need to remove the last piece of the composite.
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