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;; -*-theme-*-
;; Copyright (C) 2015-2018, 2021 Tommi Höynälänmaa
;; Distributed under GNU Lesser General Public License version 3,
;; see file doc/LGPL-3.
(define-body (standard-library singleton)
(define-param-method make-singleton (%element)
(((obj %element)) (:singleton %element) pure)
(create (:singleton %element) obj))
(define-param-method singleton-get-element (%element)
(((sgt (:singleton %element))) %element pure)
(field-ref sgt 'obj))
(define-param-method singleton-set-element! (%element)
(((sgt (:singleton %element)) (obj %element))
<none> nonpure)
(field-set! sgt 'obj obj)))
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