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| author | Stefan Monnier <monnier@iro.umontreal.ca> | 2021-10-01 14:33:37 -0400 |
|---|---|---|
| committer | Stefan Monnier <monnier@iro.umontreal.ca> | 2021-10-01 14:33:37 -0400 |
| commit | 3c972723e44c9428ea990562033acfbd84ed29d9 (patch) | |
| tree | a35464bd2e6756ce6bda2efc3cf5d47568eaec3a /lisp/emacs-lisp/subr-x.el | |
| parent | 99884c2264715b3ff811320a859d644db08ea90e (diff) | |
| download | emacs-3c972723e44c9428ea990562033acfbd84ed29d9.tar.gz | |
* lisp/emacs-lisp/subr-x.el (with-memoization): New macro
Extracted from `cl-generic.el`.
* lisp/emacs-lisp/cl-generic.el (cl--generic-get-dispatcher)
(cl--generic-build-combined-method, cl-generic-generalizers): Use it.
(cl--generic-with-memoization): Delete.
Diffstat (limited to 'lisp/emacs-lisp/subr-x.el')
| -rw-r--r-- | lisp/emacs-lisp/subr-x.el | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/lisp/emacs-lisp/subr-x.el b/lisp/emacs-lisp/subr-x.el index 3de666682fa..91ebbf9fb92 100644 --- a/lisp/emacs-lisp/subr-x.el +++ b/lisp/emacs-lisp/subr-x.el @@ -400,6 +400,18 @@ as the new values of the bound variables in the recursive invocation." (cl-labels ((,name ,fargs . ,body)) #',name) . ,aargs))) +(defmacro with-memoization (place &rest code) + "Return the value of CODE and stash it in PLACE. +If PLACE's value is non-nil, then don't bother evaluating CODE +and return the value found in PLACE instead." + (declare (indent 1) (debug (gv-place body))) + (gv-letplace (getter setter) place + `(or ,getter + ,(macroexp-let2 nil val (macroexp-progn code) + `(progn + ,(funcall setter val) + ,val))))) + (provide 'subr-x) |