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(librep.info)Functions As Hooks

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Functions As Hooks
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   Some hooks only allow a single piece of code to be hooked in.
Usually a normally-undefined function is used; to install your hook
defined a function with the name of the hook. When the hook is to be
evaluated the function is called.

   Generally the name of the hook's function will end in `-function'.

   An alternative scheme is to use a variable to store the hook, its
value should be the function to call.