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(in-package #:mulk.objective-cl)
#+cmu
(progn
(declaim (inline make-weak-value-hash-table))
(defun make-weak-value-hash-table ()
(make-hash-table :test 'eql))
(defun weak-gethash (key hash-table &optional (default nil))
(let ((pointer (gethash key hash-table default)))
(or (and (trivial-garbage:weak-pointer-p pointer)
(trivial-garbage:weak-pointer-value pointer))
(prog1 default
;; Clean up.
(remhash key hash-table)))))
(defun (setf weak-gethash) (value key hash-table)
(setf (gethash key hash-table)
(trivial-garbage:make-weak-pointer value))))
#-cmu
(progn
(declaim (inline make-weak-value-hash-table))
(defun make-weak-value-hash-table ()
(trivial-garbage:make-weak-hash-table :weakness :value
:test 'eql))
(setf (fdefinition 'weak-gethash) (fdefinition 'gethash)
(fdefinition '(setf weak-gethash)) (fdefinition '(setf gethash))))
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