This command inserts a line break and indents the new line in a manner
appropriate to the context. In normal code, it does the work of
newline), in a C preprocessor line it additionally
inserts a ‘\’ at the line break, and within comments it’s like
c-context-line-break isn’t bound to a key by default, but it
needs a binding to be useful. The following code will bind it to
RET. We use
c-initialization-hook here to make
sure the keymap is loaded before we try to change it.
(defun my-bind-clb () (keymap-set c-mode-base-map "RET" 'c-context-line-break)) (add-hook 'c-initialization-hook 'my-bind-clb)
Put mark at the end of a function definition, and put point at the
Fill a paragraph, handling C and C++ comments (
If any part of the current line is a comment or within a comment, this
command fills the comment or the paragraph of it that point is in,
preserving the comment indentation and comment delimiters.
Run the C preprocessor on the text in the region, and show the result,
which includes the expansion of all the macro calls
c-macro-expand). The buffer text before the region is also
included in preprocessing, for the sake of macros defined there, but the
output from this part isn’t shown.
When you are debugging C code that uses macros, sometimes it is hard to figure out precisely how the macros expand. With this command, you don’t have to figure it out; you can see the expansions.
Insert or align ‘\’ characters at the ends of the lines of the
c-backslash-region). This is useful after writing or
editing a C macro definition.
If a line already ends in ‘\’, this command adjusts the amount of whitespace before it. Otherwise, it inserts a new ‘\’. However, the last line in the region is treated specially; no ‘\’ is inserted on that line, and any ‘\’ there is deleted.
Highlight parts of the text according to its preprocessor conditionals. This command displays another buffer named *CPP Edit*, which serves as a graphic menu for selecting how to display particular kinds of conditionals and their contents. After changing various settings, click on ‘[A]pply these settings’ (or go to that buffer and type a) to rehighlight the C mode buffer accordingly.
Display the syntactic information about the current source line
c-show-syntactic-information). This information directs how
the line is indented.
CWarn minor mode highlights certain suspicious C and C++ constructions:
You can enable the mode for one buffer with the command M-x
cwarn-mode, or for all suitable buffers with the command M-x
global-cwarn-mode or by customizing the variable
global-cwarn-mode. You must also enable Font Lock mode to make
Hide-ifdef minor mode hides selected code within ‘#if’ and
‘#ifdef’ preprocessor blocks. If you change the variable
t, Hide-ifdef minor mode
shadows preprocessor blocks by displaying them with a less
prominent face, instead of hiding them entirely. See the
documentation string of
hide-ifdef-mode for more information.
Find a file related in a special way to the file visited by the
current buffer. Typically this will be the header file corresponding
to a C/C++ source file, or vice versa. The variable
ff-related-file-alist specifies how to compute related file