C++ FAQ Celebrating Twenty-One Years of the C++ FAQ!!!
(Click here for a personal note from Marshall Cline.)
Section 40:
40.1 How can I generate HTML documentation for my classes? Does C++ have anything similar to javadoc?
40.2 Is there a TeX or LaTeX macro that fixes the spacing on "C++"?
40.3 Are there any pretty-printers that reformat C++ source code?
40.4 Is there a C++-mode for GNU emacs? If so, where can I get it?
40.5 Where can I get OS-specific questions answered (e.g., BC++, Windows, etc)?
40.6 Why does my DOS C++ program says "Sorry: floating point code not linked"?
40.7 Why does my BC++ Windows app crash when I'm not running the BC45 IDE?
[40.4] Is there a C++-mode for GNU emacs? If so, where can I get it?

Yes, there is a C++-mode for GNU emacs.

The latest and greatest version of C++-mode (and C-mode) is implemented in the file cc-mode.el. It is an extension of Detlef and Clamen's version. A version is included with emacs. Newer version are available from the elisp archives.