From 4b66297ea0b0ed2ec5c4421878a31f5b27448624 Mon Sep 17 00:00:00 2001
From: Yinan Zhang <zyn8950@gmail.com>
Date: Thu, 2 Apr 2020 13:14:24 -0700
Subject: [PATCH] Add move constructor to ql module

---
 include/jemalloc/internal/ql.h |  5 +++++
 test/unit/ql.c                 | 23 ++++++++++++++++++++++-
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/include/jemalloc/internal/ql.h b/include/jemalloc/internal/ql.h
index b1ce4793..16cd88d5 100644
--- a/include/jemalloc/internal/ql.h
+++ b/include/jemalloc/internal/ql.h
@@ -18,6 +18,11 @@ struct {								\
 	(a_head)->qlh_first = NULL;					\
 } while (0)
 
+#define ql_move(a_head_dest, a_head_src) do {				\
+	(a_head_dest)->qlh_first = (a_head_src)->qlh_first;		\
+	(a_head_src)->qlh_first = NULL;					\
+} while (0)
+
 #define ql_empty(a_head) ((a_head)->qlh_first == NULL)
 
 #define ql_elm_new(a_elm, a_field) qr_new((a_elm), a_field)
diff --git a/test/unit/ql.c b/test/unit/ql.c
index 8f689389..f9130582 100644
--- a/test/unit/ql.c
+++ b/test/unit/ql.c
@@ -282,6 +282,26 @@ TEST_BEGIN(test_ql_rotate) {
 }
 TEST_END
 
+TEST_BEGIN(test_ql_move) {
+	list_head_t head_dest, head_src;
+	list_t entries[NENTRIES];
+	unsigned i;
+
+	ql_new(&head_src);
+	ql_move(&head_dest, &head_src);
+	test_empty_list(&head_src);
+	test_empty_list(&head_dest);
+
+	init_entries(entries, sizeof(entries)/sizeof(list_t));
+	for (i = 0; i < NENTRIES; i++) {
+		ql_tail_insert(&head_src, &entries[i], link);
+	}
+	ql_move(&head_dest, &head_src);
+	test_empty_list(&head_src);
+	test_entries_list(&head_dest, entries, NENTRIES);
+}
+TEST_END
+
 int
 main(void) {
 	return test(
@@ -292,5 +312,6 @@ main(void) {
 	    test_ql_head_remove,
 	    test_ql_insert,
 	    test_ql_concat_split,
-	    test_ql_rotate);
+	    test_ql_rotate,
+	    test_ql_move);
 }