Set the variable
c-basic-offset. See Getting Started.
Emacs’s convention used to be that RET just adds a newline, and that C-j adds a newline and indents it. In Emacs-24.4, this convention was reversed.
If you use an older Emacs and you want RET do this
too, add this to your
(define-key c-mode-base-map "\C-m" 'c-context-line-break)
See Getting Started. This was a very common question.
Interactively, change the comment style with C-c C-k. See Minor Modes.
To configure this setting, say, for files within the gdb project, you could amend your C++ Mode hook like this:
(defun my-c++-mode-hook () (if (string-match "/gdb/" (buffer-file-name)) (c-toggle-comment-style 1))) (add-hook 'c++-mode-hook 'my-c++-mode-hook)
This is now the default, so you don’t need to do anything. To restore
the previous default, indenting lambda expressions to the right of the
constructs which introduce them, change the offset associated with
inlambda from 0 to
c-lineup-inexpr-block. For example,
if you are setting offsets in a hook function you might include the
(c-set-offset 'inlambda 'c-lineup-inexpr-block)
For details of the different ways you can make this setting, Configuration Basics.
Deactivate “electric minor mode” with C-c C-l. See Getting Started.
Visit the file and hit C-x h to mark the whole buffer. Then hit C-M-\. See Indentation Commands.
First move to the brace which opens the block with C-M-u, then reindent that expression with C-M-q. See Indentation Commands.
(c-set-offset 'substatement-open 0)in my .emacs file but I get an error saying that
c-set-offset’s function definition is void. What’s wrong?
This means that CC Mode hasn’t yet been loaded into your Emacs
session by the time the
c-set-offset call is reached, most
likely because CC Mode is being autoloaded. Instead of putting the
c-set-offset line in your top-level .emacs file, put it
c-initialization-hook (see Hooks), or simply
(setq c-offsets-alist '((substatement-open . 0)))
It’s due to the ad-hoc rule in (X)Emacs that such open parens always start defuns (which translates to functions, classes, namespaces or any other top-level block constructs in the CC Mode languages). See Left Margin Paren in GNU Emacs Manual, for details (See Defuns in GNU Emacs Manual, in the Emacs 20 manual).
This heuristic is built into the core syntax analysis routines in (X)Emacs, so it’s not really a CC Mode issue. However, in Emacs 21.1 it became possible to turn it off55 and CC Mode does so there since it’s got its own system to keep track of blocks.
Using the variable