Forcing C++ to reformat

[exits funnel]

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.

-exits

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