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author | Mario Lang <mlang@delysid.org> | 2016-07-10 01:18:47 +0200 |
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committer | Mario Lang <mlang@delysid.org> | 2016-07-10 01:18:47 +0200 |
commit | 466ee1b3ea76425d201b5d59950e88251870c836 (patch) | |
tree | e9fffa1695adbabcaba923e3dfe0bb928f57008a /lisp/gnus/gnus-util.el | |
parent | c3223dd505ba0ecde57371eae7e9a59637a852e4 (diff) | |
download | emacs-466ee1b3ea76425d201b5d59950e88251870c836.tar.gz |
An efficient built-in mapcan
A built-in version of `mapcan' avoids consing up (and GC'ing) the
intermediate list.
* src/fns.c (Fmapcan): New built-in.
(syms_of_fns): Define.
* lisp/emacs-lisp/cl.el (mapcan): Remove defalias.
* lisp/emacs-lisp/cl-extra.el (cl-mapcan): Use built-in `mapcan'
if only one sequence is provided.
* lisp/progmodes/hideif.el (hif-delimit):
* lisp/dired-aux.el (dired-do-find-regexp):
* lisp/woman.el (woman-parse-colon-path): Use `mapcan' instead of
`cl-mapcan'.
* lisp/woman.el (eval-when-compile): Require 'cl-lib only when
compiling.
* lisp/mouse.el (mouse-buffer-menu-map):
* lisp/net/pop3.el (pop3-uidl-dele):
* lisp/progmodes/gud.el (gud-jdb-build-source-files-list):
* lisp/cedet/semantic/db-find.el (semanticdb-fast-strip-find-results):
* lisp/cedet/semantic/symref/grep.el (semantic-symref-derive-find-filepatterns):
* lisp/gnus/nnmail.el (nnmail-split-it):
* lisp/gnus/gnus-sum.el (gnus-articles-in-thread):
* lisp/gnus/gnus-registry.el (gnus-registry-sort-addresses):
* lisp/gnus/gnus-util.el (gnus-mapcar): Use `mapcan'.
Diffstat (limited to 'lisp/gnus/gnus-util.el')
-rw-r--r-- | lisp/gnus/gnus-util.el | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/gnus/gnus-util.el b/lisp/gnus/gnus-util.el index 906ea603770..b6ef4334e7e 100644 --- a/lisp/gnus/gnus-util.el +++ b/lisp/gnus/gnus-util.el @@ -1599,7 +1599,7 @@ sequence, this is like `mapcar'. With several, it is like the Common Lisp heads)) nil)) (setq ,result-tail (cdr ,result-tail) - ,@(apply 'nconc (mapcar (lambda (h) (list h (list 'cdr h))) heads)))) + ,@(mapcan (lambda (h) (list h (list 'cdr h))) heads))) (cdr ,result))) `(mapcar ,function ,seq1))) |