diff options
Diffstat (limited to 'lisp/emacs-lisp/cl-lib.el')
| -rw-r--r-- | lisp/emacs-lisp/cl-lib.el | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/lisp/emacs-lisp/cl-lib.el b/lisp/emacs-lisp/cl-lib.el index 8d63a3cccfa..3f40ab07605 100644 --- a/lisp/emacs-lisp/cl-lib.el +++ b/lisp/emacs-lisp/cl-lib.el @@ -114,7 +114,10 @@ a future Emacs interpreter will be able to use it.") (defmacro cl-incf (place &optional x) "Increment PLACE by X (1 by default). PLACE may be a symbol, or any generalized variable allowed by `setf'. -The return value is the incremented value of PLACE." +The return value is the incremented value of PLACE. + +If X is specified, it should be an expression that should +evaluate to a number." (declare (debug (place &optional form))) (if (symbolp place) (list 'setq place (if x (list '+ place x) (list '1+ place))) @@ -123,7 +126,10 @@ The return value is the incremented value of PLACE." (defmacro cl-decf (place &optional x) "Decrement PLACE by X (1 by default). PLACE may be a symbol, or any generalized variable allowed by `setf'. -The return value is the decremented value of PLACE." +The return value is the decremented value of PLACE. + +If X is specified, it should be an expression that should +evaluate to a number." (declare (debug cl-incf)) (if (symbolp place) (list 'setq place (if x (list '- place x) (list '1- place))) @@ -560,4 +566,9 @@ of record objects." (t (advice-remove 'type-of #'cl--old-struct-type-of)))) +(defun cl-constantly (value) + "Return a function that takes any number of arguments, but returns VALUE." + (lambda (&rest _) + value)) + ;;; cl-lib.el ends here |