chore: import upstream snapshot with attribution

test/cpp/cinn/common/shared_test.cc

@@ -0,0 +1,55 @@
+// Copyright (c) 2021 CINN Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "paddle/cinn/common/shared.h"
+
+#include <glog/logging.h>
+#include <gtest/gtest.h>
+
+#include "paddle/cinn/common/object.h"
+
+namespace cinn {
+namespace common {
+
+struct A : public Object {
+  const char *type_info() const override { return "A"; }
+
+  Shared<A> other;
+};
+
+class B : public Object {};
+
+TEST(Shared, test) {
+  Shared<A> a_ref(make_shared<A>());
+  ASSERT_EQ(ref_count(a_ref.get()).val(), 1);
+
+  {  // local copy
+    Shared<A> b = a_ref;
+    EXPECT_EQ(ref_count(a_ref.get()).val(), 2);
+    ASSERT_EQ(ref_count(b.get()).val(), 2);
+  }
+
+  ASSERT_EQ(ref_count(a_ref.get()).val(), 1);
+}
+
+TEST(Shared, cycle_share) {
+  {
+    Shared<A> a_ref(make_shared<A>());
+    a_ref->other = a_ref;
+    ASSERT_EQ(a_ref->__ref_count__.val(), 2);
+  }
+}
+
+}  // namespace common
+}  // namespace cinn