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From: Harald Maier <harald@maierh.de>
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Subject: Re: Forcing C++ to reformat
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exits funnel <exitsfunnel@yahoo.com> writes:

> Hello,
>
> I use emacs to edit C++ source files.  I've modified
> cc mode to format my code as I desire but I' run into
> a common problem.  Let's say I'm typing and I
> accidently forget to close a brace or a paren and then
> continue on coding.  The following code is (of course)
> formatted correctly according to what I actually typed
> but incorrectly according to what I meant to type :) 
> Okay, so I discover the probelm (say a missing close
> paren after an argument list) and go back and fix it. 
> How can I force the buffer to be reformatted at this
> point?  I hope this makes sense as I'm not too hip to
> all the emacs lingo yet.  Thanks in advance for any
> replies.

Have you tried 'M-x show-paren-mode'?

Harald