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6.11.6.3 Handling Scheme-level hooks from C code

Here is an example of how to handle Scheme-level hooks from C code using the above functions.

if (scm_is_true (scm_hook_p (obj)))
  /* handle Scheme-level hook using C functions */
  scm_reset_hook_x (obj);
else
  /* do something else (obj is not a hook) */