weak-ref

Homepage: https://github.com/skeeto/elisp-weak-ref

Author: Christopher Wellons

Updated: 2020-Feb-17

Summary

Weak references for Emacs Lisp

Commentary

The Emacs Lisp environment supports weak references, but only for
hash table keys and values. This can be exploited to generalize
weak references into two convenient macros:

  * `weak-ref'   : create a weak reference to an object
  * `weak-ref-deref' : access the object behind a weak reference

The weakness can be demonstrated like so:

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

See also: https://github.com/melpa/melpa/pull/6670

Dependencies

• ert