diff options
Diffstat (limited to 'libguile/feature.h')
-rw-r--r-- | libguile/feature.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/libguile/feature.h b/libguile/feature.h index aa61c740f..8ba59891b 100644 --- a/libguile/feature.h +++ b/libguile/feature.h @@ -42,11 +42,14 @@ * If you write modifications of your own for GUILE, it is your choice * whether to permit this exception to apply to your modifications. * If you do not wish that, delete this exception notice. */ + +/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, + gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ #include "libguile/__scm.h" -#define SCM_HOOKP(x) (SCM_TYP16 (x) == scm_tc16_hook) +#define SCM_HOOKP(x) (SCM_NIMP(x) && (SCM_TYP16 (x) == scm_tc16_hook)) #define SCM_HOOK_ARITY(hook) (SCM_CAR (hook) >> 16) #define SCM_HOOK_NAME(hook) SCM_CADR (hook) #define SCM_HOOK_PROCEDURES(hook) SCM_CDDR (hook) |