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From: Harald Hanche-Olsen <hanche@math.ntnu.no>
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Subject: Re: Toggle Keybinding
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+ "Paulo J. Matos" <pocmatos@gmail.com>:

| (add-hook 'c++-mode-hook
| 	  (lambda ()
| 	    (local-set-key "M-+" 'hs-toggle-hiding)))
|
| For some reason the keybinding is not working.

It probably does, but you may have a hard time typing a capital M in
the buffer, since M is now a prefix.

| Any ideas? Should the + in "M-+" be escaped somehow?

No, the M should, in order to be interpreted as meta:

"\M-+" should do the trick.
You can also use a vector: [?\M-+].

-- 
* Harald Hanche-Olsen     <URL:http://www.math.ntnu.no/~hanche/>
- It is undesirable to believe a proposition
  when there is no ground whatsoever for supposing it is true.
  -- Bertrand Russell