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[Emacs-diffs] /srv/bzr/emacs/trunk r105093: Add a new, simple definition
From: |
Lars Magne Ingebrigtsen |
Subject: |
[Emacs-diffs] /srv/bzr/emacs/trunk r105093: Add a new, simple definition of `remove-duplicates' |
Date: |
Mon, 11 Jul 2011 15:33:05 +0200 |
User-agent: |
Bazaar (2.3.1) |
------------------------------------------------------------
revno: 105093
committer: Lars Magne Ingebrigtsen <address@hidden>
branch nick: trunk
timestamp: Mon 2011-07-11 15:33:05 +0200
message:
Add a new, simple definition of `remove-duplicates'
modified:
lisp/ChangeLog
lisp/subr.el
=== modified file 'lisp/ChangeLog'
--- a/lisp/ChangeLog 2011-07-10 14:09:05 +0000
+++ b/lisp/ChangeLog 2011-07-11 13:33:05 +0000
@@ -1,3 +1,7 @@
+2011-07-11 Lars Magne Ingebrigtsen <address@hidden>
+
+ * subr.el (remove-duplicates): New conveniency function.
+
2011-07-10 Lars Magne Ingebrigtsen <address@hidden>
* tool-bar.el (tool-bar-mode): Clarify positive/negative arguments
=== modified file 'lisp/subr.el'
--- a/lisp/subr.el 2011-07-09 00:50:01 +0000
+++ b/lisp/subr.el 2011-07-11 13:33:05 +0000
@@ -173,7 +173,7 @@
(progn
;; If we reload subr.el after having loaded CL, be careful not to
;; overwrite CL's extended definition of `dolist', `dotimes',
- ;; `declare', `push' and `pop'.
+ ;; `declare', `push', `pop' and `remove-duplicates'.
(defmacro dolist (spec &rest body)
"Loop over a list.
@@ -250,6 +250,15 @@
Treated as a declaration when used at the right place in a
`defmacro' form. \(See Info anchor `(elisp)Definition of declare'.)"
nil)
+
+(defun remove-duplicates (list)
+ "Return a copy of LIST with all duplicate elements removed."
+ (let ((result nil))
+ (while list
+ (unless (member (car list) result)
+ (push (car list) result))
+ (pop list))
+ (nreverse result)))
))
(defmacro ignore-errors (&rest body)
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