Getting emacs's access-label indentation to add an indentation level

Question

I was looking at this question and realized I had a similar concern that is not thoroughly answered there.

I want access specifiers to add a level of indentation. On this and this page, I found that the syntactic symbol I need to indent is access-label. Thus, I need to use (c-set-offset 'access-label '0).

However, this only indents the line containing the access label and not anything that comes after. What I get is this,

class foo {
  public:
  void someFunc(); // Doesn't take the indentation of the access label into account
  ...
  };

What I want is,

class foo {
  public:
    void someFunc();
  ...
  };

How would I do this? Is there some other variable I'm suppose to modify?

Answer 1

you need to use inclass to set the indenting of functions & members inside the class. But this will lead to situation that functions & members in the struct will be indented by 2 tabs, instead of one, so we need to have a special function to set correct indentation width. I'm using following config to achieve this (I've got the snippet from somewhere in the internet, maybe from emacswiki)...

Answer 2

If you use the braces on new line, the workaround above is not completely correct; you must check if after first goto you are before an open brace. This is my more generale workaround:

(defun agb/c++-mode-hook ()
  (c-set-offset 'access-label '-)
  (c-set-offset 'topmost-intro '0)
  (c-set-offset 'inclass '(lambda (arg)
                            (let ((inclass (assoc 'inclass c-syntactic-context)))
                              (save-excursion
                                (goto-char (c-langelem-pos inclass))
                                (if (looking-at "{")
                                    (goto-char (c-langelem-pos (assoc 'class-open (c-guess-basic-syntax)))))
                                (if (or (looking-at "struct")
                                        (looking-at "typedef struct"))
                                    '+
                                  '++))))))