Indenting nested namespaces on the same line to just one level

In emacs 21:

namespace Abc { namespace Def { 
    class X;
    namespace Ghi {
        class Y;
    }
} }

But now in emacs 22.2.1:

namespace Abc { namespace Def {
        class X;
        namespace Ghi {
            class Y;
        }
    } }

How do I get the old behaviour back? Note that I do开发者_运维问答n't want a fixed column for indentation, I want it to indent one level regardless of how many 'namespace {' the line contains.

---

I actually found the answer myself, in a moment of clear thinking:

(defun followed-by (cases)
  (cond ((null cases) nil)
        ((assq (car cases) 
               (cdr (memq c-syntactic-element c-syntactic-context))) t)
        (t (followed-by (cdr cases)))))


(c-add-style  "foo"      
              `( ...
        (c-offsets-alist
         ( ... )
         (innamespace
          . (lambda (x) 
          (if (followed-by 
               '(innamespace namespace-close)) 0 '+))))))

The '...' symbolizes other personalizations of course.