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nil is false, whee

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* libguile/boolean.h (scm_is_false): Recognize nil as false, by default.
  (scm_is_bool): Recognize nil as a boolean.

* libguile/boolean.c (scm_not, scm_boolean, scm_to_bool, scm_is_bool):
  Adapt to treat nil as false.

* libguile/vm-i-system.c (br-if, br-if-not): Just use scm_is_false
  instead of specifically mentioning nil.
This commit is contained in:
Andy Wingo 2010-03-23 20:23:19 +01:00
parent 655aadf4b0
commit d38b431ace
3 changed files with 14 additions and 14 deletions
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13
libguile/boolean.c
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@ -56,28 +56,27 @@ verify (SCM_VALUES_DIFFER_IN_EXACTLY_TWO_BIT_POSITIONS \
SCM_DEFINE (scm_not, "not", 1, 0, 0,
(SCM x),
"Return @code{#t} iff @var{x} is @code{#f}, else return @code{#f}.")
"Return @code{#t} iff @var{x} is false, else return @code{#f}.")
#define FUNC_NAME s_scm_not
{
return scm_from_bool (scm_is_false_or_nil (x));
return scm_from_bool (scm_is_false (x));
}
#undef FUNC_NAME
SCM_DEFINE (scm_boolean_p, "boolean?", 1, 0, 0,
(SCM obj),
"Return @code{#t} iff @var{obj} is either @code{#t} or @code{#f}.")
"Return @code{#t} iff @var{obj} is @code{#t} or false.")
#define FUNC_NAME s_scm_boolean_p
{
return scm_from_bool (scm_is_bool_or_nil (obj));
return scm_from_bool (scm_is_bool (obj));
}
#undef FUNC_NAME
int
scm_to_bool (SCM x)
{
/* XXX Should this first test use scm_is_false_or_nil instead? */
if (scm_is_eq (x, SCM_BOOL_F))
if (scm_is_false (x))
return 0;
else if (scm_is_eq (x, SCM_BOOL_T))
return 1;
@ -93,7 +92,7 @@ int
scm_is_bool (SCM obj)
{
/* This must match the macro definition of `scm_is_bool ()'. */
return scm_is_bool_and_not_nil (obj);
return scm_is_bool_or_nil (obj);
}