LibraryLink`

unregisterLibraryCallbackManager （C 函数）

is a library callback function that unregisters a library expression manager with name mgr.

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Used in C/C++ code in a library function called from the Wolfram Language, typically in library uninitialization functions WolframLibrary_uninitialize.
A nonzero error code value will be returned if manager mgr is not currently registered.
When the manager mgr registered by registerLibraryCallbackManager (mgr, mfun) is unregistered, all callback functions still connected through the manager mgr will be released.

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