Emacs C++-mode incorrect indentation?

Question

I\'m running emacs 23 with c++-mode and having some indentation problems. Suppose I have this code:

void foo()
{
   if (cond)
     { <---
        int i;
          


        

Answer 1

The accepted answer is actually wrong. Emacswiki won't help.

Insert following code into ~/.emacs:

(defun fix-c-indent-offset-according-to-syntax-context (key val)
  ;; remove the old element
  (setq c-offsets-alist (delq (assoc key c-offsets-alist) c-offsets-alist))
  ;; new value
  (add-to-list 'c-offsets-alist (cons key val)))

(add-hook 'c-mode-common-hook
          (lambda ()
            (when (derived-mode-p 'c-mode 'c++-mode 'java-mode)
              ;; indent
              (fix-c-indent-offset-according-to-syntax-context 'substatement-open 0))
            ))

See http://blog.binchen.org/posts/ccjava-code-indentation-in-emacs.html for technical details.

The key issue is c-set-offset is not reliable to detect syntax context any more (Emacs24.3.1). So the only reliable way is to analyze the original emacs code. The detailed steps to hack the code is listed in my article, basically you need read the function c-indent-line which is defined in /usr/share/emacs/24.3/lisp/progmodes/cc-cmds.el

Some people complained that my setup does not work. Actually it works in all stable versions of Emacs (23.4, 24.3, 24.4) if you don't change default setup (The indention has different profiles, my setup is based on default profile).

My key point is, on this specific issue, you need read the code.