fix ObSEArray::pop_back bug

unittest/lib/test_ob_searray.cpp

@@ -0,0 +1,95 @@
+/**
+ * Copyright (c) 2021 OceanBase
+ * OceanBase CE is licensed under Mulan PubL v2.
+ * You can use this software according to the terms and conditions of the Mulan PubL v2.
+ * You may obtain a copy of Mulan PubL v2 at:
+ *          http://license.coscl.org.cn/MulanPubL-2.0
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PubL v2 for more details.
+ */
+
+#include <gtest/gtest.h>
+#include <cstdint>
+#include "lib/container/ob_se_array.h"
+
+namespace oceanbase
+{
+using namespace common;
+
+namespace unittest
+{
+
+class TestObSEArray : public ::testing::Test
+{
+public :
+  virtual void SetUp() {}
+  virtual void TearDown() {}
+};
+
+static int64_t g_count = 0;
+
+class TestObj
+{
+public:
+  TestObj() : t_(0) { g_count++; }
+  explicit TestObj(const int v) : t_(v) { g_count++; }
+  TestObj(const TestObj &obj) { t_ = obj.t_; g_count++; }
+  ~TestObj() { g_count--; }
+  int get_value() const { return t_; }
+  TO_STRING_KV(K_(t));
+private:
+  int t_;
+};
+
+TEST(TestObSEArray, pop_back)
+{
+  static const int magic_num = 2651356;
+  static const int64_t LOCAL_ARRAY_SIZE = 4;
+  static const int64_t MAX_OBJ_COUNT = LOCAL_ARRAY_SIZE + 16;
+  ObSEArray<TestObj, LOCAL_ARRAY_SIZE> a1;
+  ObSEArray<int, LOCAL_ARRAY_SIZE> a2;
+
+  for (int64_t i = 0; i < MAX_OBJ_COUNT; i++) {
+    ASSERT_EQ(OB_SUCCESS, a1.push_back(TestObj(magic_num)));
+    ASSERT_EQ(OB_SUCCESS, a2.push_back(magic_num));
+  }
+
+  ASSERT_EQ(MAX_OBJ_COUNT, g_count);
+
+  for (int64_t i = 0; i < MAX_OBJ_COUNT / 2; i++) {
+    a1.pop_back();
+    a2.pop_back();
+  }
+
+  ASSERT_EQ(MAX_OBJ_COUNT - MAX_OBJ_COUNT / 2, g_count);
+
+  {
+    TestObj tmp_obj;
+    ASSERT_EQ(OB_SUCCESS, a1.pop_back(tmp_obj));
+    ASSERT_EQ(magic_num, tmp_obj.get_value());
+  }
+
+  int tmp = 0;
+  ASSERT_EQ(OB_SUCCESS, a2.pop_back(tmp));
+  ASSERT_EQ(magic_num, tmp);
+
+  ASSERT_EQ(MAX_OBJ_COUNT - MAX_OBJ_COUNT / 2 - 1, g_count);
+
+  a1.destroy();
+  a2.destroy();
+
+  ASSERT_EQ(0, g_count);
+}
+
+} // end of unittest
+} // end of oceanbase
+
+int main(int argc, char **argv)
+{
+  OB_LOGGER.set_file_name("test_ob_se_array.log", true);
+  OB_LOGGER.set_log_level("INFO");
+  ::testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
+}