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Showing content from https://github.com/skeeto/elisp-weak-ref below:

skeeto/elisp-weak-ref: Weak references for Emacs Lisp

• Pricing

This package provides two functions:

• weak-ref : Creates a weak reference to an object
• weak-ref-deref : Access the object behind a weak reference

See it in action:

(setq ref (weak-ref (list 1 2 3)))
(weak-ref-deref ref) ; => (1 2 3)
(garbage-collect)
(weak-ref-deref ref) ; => nil

It's build on top of the weak references provided by hash tables.

Weak references for Emacs Lisp

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