🚀 go-pugleaf

I have noticed several problems with c++ mode. Is c++ mode a supported part of
gnuemacs? I am using emacs version 18.57.3, and the file c++-mode.el begins as
follows:

  ;; C++ code editing commands for Emacs
  ;; 1987 Dave Detlefs  (dld@cs.cmu.edu) 
  ;; and  Stewart Clamen (clamen@cs.cmu.edu).
  ;; Done by fairly faithful modification of:
  ;; c-mode.el, Copyright (C) 1985 Richard M. Stallman.

(Is this the right one?)

Anyway, here are the problems:


1) Parenthesis-like characters are treated as such even if they are embedded in
a string or character constant. For example:

  // -*- C++ -*-

  static char chars [80];
  
  int fun ()
  {
    int i,j,k;
    for (i=0; chars[i]!=']'; i++);
    return i;
  }

The embedded `]` matches the parenthesis following the for.


2) Comments are not ignored for the purpose of matching parentheses. Examples:

  int ff ()
  {
    // This comment should be ignored. }
    more_code_here ();
  }

  int gg ()
  {
    /* This comment should be ignored. } */
    mode_code_here ();
  }

In both cases, the } inside the comment terminates the { at the beginning of
the function. But really, all text inside a command must be ignored. (I realize
that this may be difficult with /* ... */ comments, but with // comments it
should be very easy to implement.)


2.5) The above applies to conditionally defined code as well. For example,
braces inside an #if 0...#endif construct. I believe these should be ignored as
well. 


3) Old style comments are messed up when doing c++-indent-defun (ESC C-x).
Before: 

  int hh ()
  {
    /* A multiline comment in a c++ function.
       I'll make it span several lines.
       Another line.
       Yet another. 
     */
  }

After:

  int hh ()
  {
    /* A multiline comment in a c++ function.
      I'll make it span several lines.
        Another line.
          Yet another. 
            */
  }


David Cogen.