1 files changed, 36 insertions, 0 deletions
diff --git a/include/crm/common/lists_internal.h b/include/crm/common/lists_internal.h
new file mode 100644
index 0000000..1de695a
--- /dev/null
+++ b/include/crm/common/lists_internal.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2020-2022 the Pacemaker project contributors
+ *
+ * The version control history for this file may have further details.
+ *
+ * This source code is licensed under the GNU Lesser General Public License
+ * version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
+ */
+
+#ifndef PCMK__LISTS_INTERNAL__H
+#define PCMK__LISTS_INTERNAL__H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <glib.h>
+
+/*!
+ * \internal
+ * \brief Return the list that is \p from - \p items
+ *
+ * \param[in] from  Source list
+ * \param[in] items List containing items to remove from \p from
+ * \param[in] cmp   Function used to compare list elements
+ *
+ * \return Newly allocated list
+ */
+GList *pcmk__subtract_lists(GList *from, const GList *items,
+                            GCompareFunc cmp);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif