Setting comment-indent-function value

[luca . spinacci]

I'm using Emacs 21.3.1 (i386-mingw-nt5.0.2195) of 2004-03-10 on NYAUMO.

I would like to set the value c++-comment-indent for
comment-indent-function in c++-mode
but opening a c/c++ file/buffer the above value is c-comment-indent locally
to that buffer
and globally c++-comment-indent (...used (setq comment-indent-function
'c++-comment-indent) in .emacs file).

Thanks in advance.
Luca.