( Hooks

Info Catalog ( General Conversion ( Utility Functions
 24.6 Hooks
 A hook is a list of procedures to be called at well defined points in
 time.  Typically, an application provides a hook H and promises its
 users that it will call all of the procedures in H at a defined point
 in the application's processing.  By adding its own procedure to H, an
 application user can tap into or even influence the progress of the
    Guile itself provides several such hooks for debugging and
 customization purposes: these are listed in a subsection below.
    When an application first creates a hook, it needs to know how many
 arguments will be passed to the hook's procedures when the hook is run.
 The chosen number of arguments (which may be none) is declared when the
 hook is created, and all the procedures that are added to that hook must
 be capable of accepting that number of arguments.
    A hook is created using `make-hook'.  A procedure can be added to or
 removed from a hook using `add-hook!' or `remove-hook!', and all of a
 hook's procedures can be removed together using `reset-hook!'.  When an
 application wants to run a hook, it does so using `run-hook'.


* Hook Example                Hook usage by example.
* Hook Reference              Reference of all hook procedures.
* C Hooks                     Hooks for use from C code.
* Guile Hooks                 Hooks provided by Guile.
Info Catalog ( General Conversion ( Utility Functions
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