I use the following line in the .emacs file to automatically show the help page for function c under the cursor when I press F1 (of course, it is assumed that you have the developer pages installed):
(global-set-key [f1] (lambda () (interactive) (manual-entry (current-word))))
For example, on the Ubuntu Linux system, the manpages-dev and libstdc++6-4.4-doc contain man files for the standard C and C ++ libraries, respectively. Similar packages exist for other systems, including MacOSX.
kosack
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