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-rw-r--r--libguile/weak-list.h66
1 files changed, 66 insertions, 0 deletions
diff --git a/libguile/weak-list.h b/libguile/weak-list.h
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--- /dev/null
+++ b/libguile/weak-list.h
@@ -0,0 +1,66 @@
+#ifndef SCM_WEAK_LIST_H
+#define SCM_WEAK_LIST_H
+
+/* Copyright 2016,2018
+ Free Software Foundation, Inc.
+
+ This file is part of Guile.
+
+ Guile is free software: you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published
+ by the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Guile is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+ License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with Guile. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+
+
+#include "libguile/pairs.h"
+#include "libguile/weak-vector.h"
+
+
+
+static inline SCM
+scm_i_weak_cons (SCM car, SCM cdr)
+{
+ return scm_cons (scm_c_make_weak_vector (1, car), cdr);
+}
+
+static inline SCM
+scm_i_weak_car (SCM pair)
+{
+ return scm_c_weak_vector_ref (scm_car (pair), 0);
+}
+
+static inline void
+scm_i_visit_weak_list (SCM *list_loc, void (*visit) (SCM))
+{
+ SCM in = *list_loc, out = SCM_EOL;
+
+ while (scm_is_pair (in))
+ {
+ SCM car = scm_i_weak_car (in);
+ SCM cdr = scm_cdr (in);
+
+ if (!scm_is_eq (car, SCM_BOOL_F))
+ {
+ scm_set_cdr_x (in, out);
+ out = in;
+ visit (car);
+ }
+
+ in = cdr;
+ }
+
+ *list_loc = out;
+}
+
+
+#endif /* SCM_WEAK_LIST_H */