summaryrefslogtreecommitdiff
path: root/libguile/procprop.c
diff options
context:
space:
mode:
Diffstat (limited to 'libguile/procprop.c')
-rw-r--r--libguile/procprop.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/libguile/procprop.c b/libguile/procprop.c
index 2ad941d6a..93ee7f033 100644
--- a/libguile/procprop.c
+++ b/libguile/procprop.c
@@ -43,9 +43,23 @@ SCM_GLOBAL_SYMBOL (scm_sym_name, "name");
static SCM overrides;
+static SCM arity_overrides;
+
int
scm_i_procedure_arity (SCM proc, int *req, int *opt, int *rest)
{
+ SCM o;
+
+ o = scm_weak_table_refq (arity_overrides, proc, SCM_BOOL_F);
+
+ if (scm_is_true (o))
+ {
+ *req = scm_to_int (scm_car (o));
+ *opt = scm_to_int (scm_cadr (o));
+ *rest = scm_is_true (scm_caddr (o));
+ return 1;
+ }
+
while (!SCM_PROGRAM_P (proc))
{
if (SCM_STRUCTP (proc))
@@ -63,9 +77,27 @@ scm_i_procedure_arity (SCM proc, int *req, int *opt, int *rest)
else
return 0;
}
+
return scm_i_program_arity (proc, req, opt, rest);
}
+SCM_DEFINE (scm_set_procedure_minimum_arity_x, "set-procedure-minimum-arity!",
+ 4, 0, 0, (SCM proc, SCM req, SCM opt, SCM rest),
+ "")
+#define FUNC_NAME s_scm_set_procedure_minimum_arity_x
+{
+ int t SCM_UNUSED;
+
+ SCM_VALIDATE_PROC (1, proc);
+ SCM_VALIDATE_INT_COPY (2, req, t);
+ SCM_VALIDATE_INT_COPY (3, opt, t);
+ SCM_VALIDATE_BOOL (4, rest);
+
+ scm_weak_table_putq_x (arity_overrides, proc, scm_list_3 (req, opt, rest));
+ return SCM_UNDEFINED;
+}
+#undef FUNC_NAME
+
SCM_DEFINE (scm_procedure_minimum_arity, "procedure-minimum-arity", 1, 0, 0,
(SCM proc),
"Return the \"minimum arity\" of a procedure.\n\n"
@@ -171,6 +203,7 @@ void
scm_init_procprop ()
{
overrides = scm_c_make_weak_table (0, SCM_WEAK_TABLE_KIND_KEY);
+ arity_overrides = scm_c_make_weak_table (0, SCM_WEAK_TABLE_KIND_KEY);
#include "libguile/procprop.x"
}