base: steal Chromium's NoDestructor.
Pillage from Chromium a wrapper type that skips destruction of its
wrapped type, to avoid problems with premature destruction of
variables with static lifetime.
Test: libbase_test on host
Change-Id: I7d4541f7b59f467b232d5c4f8250dc1ea45e28fa
diff --git a/no_destructor_test.cpp b/no_destructor_test.cpp
new file mode 100644
index 0000000..f19468a
--- /dev/null
+++ b/no_destructor_test.cpp
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * 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 "android-base/no_destructor.h"
+
+#include <gtest/gtest.h>
+
+struct __attribute__((packed)) Bomb {
+ Bomb() : magic_(123) {}
+
+ ~Bomb() { exit(42); }
+
+ int get() const { return magic_; }
+
+ private:
+ [[maybe_unused]] char padding_;
+ int magic_;
+};
+
+TEST(no_destructor, bomb) {
+ ASSERT_EXIT(({
+ {
+ Bomb b;
+ if (b.get() != 123) exit(1);
+ }
+
+ exit(0);
+ }),
+ ::testing::ExitedWithCode(42), "");
+}
+
+TEST(no_destructor, defused) {
+ ASSERT_EXIT(({
+ {
+ android::base::NoDestructor<Bomb> b;
+ if (b->get() != 123) exit(1);
+ }
+
+ exit(0);
+ }),
+ ::testing::ExitedWithCode(0), "");
+}
+
+TEST(no_destructor, operators) {
+ android::base::NoDestructor<Bomb> b;
+ const android::base::NoDestructor<Bomb>& c = b;
+ ASSERT_EQ(123, b.get()->get());
+ ASSERT_EQ(123, b->get());
+ ASSERT_EQ(123, (*b).get());
+ ASSERT_EQ(123, c.get()->get());
+ ASSERT_EQ(123, c->get());
+ ASSERT_EQ(123, (*c).get());
+}