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;;;; Objective-CL, an Objective-C bridge for Common Lisp.
;;;; Copyright (C) 2007 Matthias Andreas Benkard.
;;;;
;;;; This program is free software: you can redistribute it and/or
;;;; modify it under the terms of the GNU General Public License as
;;;; published by the Free Software Foundation, either version 3 of the
;;;; License, or (at your option) any later version.
;;;;
;;;; This program is distributed in the hope that it will be useful, but
;;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;;; General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU General Public License
;;;; along with this program. If not, see
;;;; <http://www.gnu.org/licenses/>.
(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 (setf weak-gethash)))
(defun make-weak-value-hash-table ()
(trivial-garbage:make-weak-hash-table :weakness :value
:test 'eql))
(setf (fdefinition 'weak-gethash) (fdefinition 'gethash))
(defun (setf weak-gethash) (value key hash-table)
(setf (gethash key hash-table) value)))
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