LibraryLink`

unregisterLibraryExpressionManager （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 registerLibraryExpressionManager(mgr, manageFun) unregistered, manageFun will be called with mode 1 for all values of id that have been generated by evaluating that have not already been released.

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