I am using doxygen.org to comment code (and generate
documentation
from it). This requires a dedicated commenting style,
e.g.:

 /**
 * This is a doxygen comment
 * @param par this is a
parameter for this function
 * @return this is what is returned by the
function
 */
 bool my_function(int par);

When this snippet is viewed
with major mode 'c-mode', the @-keywords are
highlighted. When you set
the major mode to 'c++-mode', this is not the
case.

So for some reason
this additional highlighting is not enabled for
c++. I am not sure if
this is a bug, or disabled on purpose. Anyhow,
using doxygen for c++ is
valid.

Also it seems the doxygen highlighting does not work when you
type
comments on the same line as the '/**', e.g. like this:
 /** This
comment is not doxygen-highlighted
 */

Regards,
Toon

In GNU Emacs
24.1.50.1 (i686-suse-linux-gnu, X toolkit)
 of 2012-06-20 on
suse12-tcl
Bzr revision: 108664
eggert@cs.ucla.edu-20120619185739-mile4zpnjrqz5e8e
Windowing system
distributor `The X.Org Foundation', version 11.0.11004000
Configured
using:
 `configure '--without-toolkit-scroll-bars''

Important
settings:
 value of $LC_CTYPE: en_US.UTF-8
 value of $LANG: en_US.UTF-8

value of $XMODIFIERS: @im=local
 locale-coding-system: utf-8-unix

default enable-multibyte-characters: t

Major mode: C++/l

Minor modes
in effect:
 tooltip-mode: t
 mouse-wheel-mode: t
 tool-bar-mode: t

menu-bar-mode: t
 file-name-shadow-mode: t
 global-font-lock-mode: t

font-lock-mode: t
 blink-cursor-mode: t
 auto-composition-mode: t

auto-encryption-mode: t
 auto-compression-mode: t
 line-number-mode: t

transient-mark-mode: t
 abbrev-mode: t

Recent input:
C-x C-f <up> / t o
k <tab> s <tab> 2 <tab> T o <tab> 
C o m <tab> O b <tab> O b <tab> S
<tab> m <tab> S <tab> 
S r <backspace> <tab> <return> C-s r e b o o t
C-a 
C-n C-n C-n M-x c + + m <backspace> - m o d e <return> 
M-x f u
<backspace> <backspace> <help-echo> M-x r e 
p o r t - <tab>
<return>

Recent messages:
For information about GNU Emacs and the GNU
system, type C-h C-a.
user-error: Beginning of history; no preceding
item
Making completion list...
Note: file is write protected
Loading
cc-langs...done
Mark saved where search started
completing-read-default:
Command attempted to use minibuffer while in minibuffer

Load-path
shadows:
None found.

Features:
(shadow sort gnus-util mail-extr
emacsbug message cl-macs format-spec
rfc822 mml mml-sec mm-decode
mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader
sendmail rfc2047 rfc2045 ietf-drums
mm-util mail-prsvr mail-utils
multi-isearch cc-langs cl macroexp cl-lib
cc-mode cc-fonts cc-guess
cc-menus cc-cmds cc-styles cc-align cc-engine
cc-vars cc-defs help-mode
easymenu view time-date tooltip ediff-hook
vc-hooks lisp-float-type
mwheel x-win x-dnd tool-bar dnd fontset image
regexp-opt fringe
tabulated-list newcomment lisp-mode register page
menu-bar rfn-eshadow
timer select scroll-bar mouse jit-lock font-lock
syntax facemenu
font-core frame cham georgian utf-8-lang misc-lang
vietnamese tibetan
thai tai-viet lao korean japanese hebrew greek
romanian slovak czech
european ethiopic indian cyrillic chinese
case-table epa-hook
jka-cmpr-hook help simple abbrev minibuffer loaddefs
button faces
cus-face files text-properties overlay sha1 md5 base64
format env
code-pages mule custom widget hashtable-print-readable
backquote
make-network-process dbusbind dynamic-setting
system-font-setting
font-render-setting x-toolkit x multi-tty emacs)