1 files changed, 47 insertions, 0 deletions
diff --git a/src/shared/set.h b/src/shared/set.h
new file mode 100644
index 0000000000..76383a423a
--- /dev/null
+++ b/src/shared/set.h
@@ -0,0 +1,47 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+
+  systemd 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 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+/* Pretty straightforward set implementation. Internally based on the
+ * hashmap. That means that as a minor optimization a NULL set
+ * object will be treated as empty set for all read
+ * operations. That way it is not necessary to instantiate an object
+ * for each set use. */
+
+#include "hashmap.h"
+
+typedef struct Set Set;
+
+Set *set_new(hash_func_t hash_func, compare_func_t compare_func);
+void set_free(Set* s);
+static inline void set_freep(Set **s) {
+        set_free(*s);
+}
+
+int set_put(Set *s, void *value);
+void *set_get(Set *s, void *value);
+bool set_contains(Set *s, void *value);
+
+void *set_iterate(Set *s, Iterator *i);
+void *set_iterate_backwards(Set *s, Iterator *i);
+
+#define _cleanup_set_free_ _cleanup_(set_freep)