Re: [guile/scwm] SCM_HOOKP changed?

[Thien-Thi Nguyen <ttn@giblet.glug.org>]

   From: Thien-Thi Nguyen <ttn@giblet.glug.org>
   Date: Sun, 15 Sep 2002 13:56:54 -0700

   they should be removed
   to emphasize the two different systems.

actually removal just obfuscates.  this is better:

   2002-09-15  Thien-Thi Nguyen  <ttn@dream.glug.org>

	* scheme-utility.twerp (Hook Reference): Mention and pxref C-level hooks.
	(C Hooks): Add subsection "Handling Scheme-level hooks from C code".

see below for diff.

thi


______________________________________________
Index: scheme-utility.twerp
===================================================================
RCS file: /home/ttn/cvs/guile-core/doc/ref/scheme-utility.twerp,v
retrieving revision 1.4
diff -w -c -b -c -p -r1.4 scheme-utility.twerp
*** scheme-utility.twerp	29 Aug 2002 05:34:05 -0000	1.4
--- scheme-utility.twerp	15 Sep 2002 21:21:56 -0000
*************** The ordering of the list of procedures r
*** 402,407 ****
--- 402,411 ----
  matches the order in which those procedures would be called if the hook
  was run using @code{run-hook}.
  
+ Note that the following C functions are for handling
+ @dfn{Scheme-level} hooks in C; there are also @dfn{C-level} hooks
+ which have their own interface (@pxref{C Hooks}).
+ 
  @twerpdoc (make-hook (C scm_make_hook))
  
  @twerpdoc (hook? (C scm_hook_p))
*************** function's closure data, and the call cl
*** 529,534 ****
--- 533,556 ----
  
  @code{scm_c_hook_run}'s return value is the return value of the last
  function to be called.
+ @end deftypefn
+ 
+ @subsection Handling Scheme-level hooks from C code
+ 
+ To handle Scheme-level hooks from C code you must use the appropriate
+ C functions (@pxref{Hook Reference}).  For example:
+ 
+ @example
+ if (SCM_HOOKP (obj))
+   /* handle C-level hook */
+ else if (scm_hook_p (obj))
+   /* handle Scheme-level hook using C functions */
+ else
+   /* do something else (obj is not a hook) */
+ @end example
+ 
+ @deftypefn {C Macro} int SCM_HOOKP (x)
+ Return 1 if @var{x} is a C-level hook and 0 otherwise.
  @end deftypefn
  
  


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