10.5.8 Freeing of objects by the GC

Weak arrays and weak hash tables can be used to allow the GC to free objects.

Relevant functions are make-hash-table , set-hash-table-weak , set-array-weak , make-array and copy-to-weak-simple-vector .

For a description of weak vectors see set-array-weak in the LispWorks Reference Manual .

LispWorks User Guide - 21 Jul 2006