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10.13.7 Using special actions

In addition, users may want to perform special actions when certain types of object are garbage collected, using the functions add-special-free-action , flag-special-free-action , flag-not-special-free-action and remove-special-free-action .

For example, when a file stream is closed, and so garbage collected, the file descriptor must be closed also. This operation can be performed as a special action.


LispWorks User Guide - 7 Jul 2004

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