-int main(int argc, char **argv) {
- FLAGS_logtostderr = true;
- google::InitGoogleLogging(argv[0]);
- testing::InitGoogleTest(&argc, argv);
+template <typename C>
+static void test_enable_shared_from_this(std::shared_ptr<C> sp) {
+ ASSERT_EQ(1l, sp.use_count());
+
+ // Test shared_from_this().
+ std::shared_ptr<C> sp2 = sp->shared_from_this();
+ ASSERT_EQ(sp, sp2);
+
+ // Test weak_from_this().
+ std::weak_ptr<C> wp = sp->weak_from_this();
+ ASSERT_EQ(sp, wp.lock());
+ sp.reset();
+ sp2.reset();
+ ASSERT_EQ(nullptr, wp.lock());
+
+ // Test shared_from_this() and weak_from_this() on object not owned by a
+ // shared_ptr. Undefined in C++14 but well-defined in C++17. Also known to
+ // work with libstdc++ >= 20150123. Feel free to add other standard library
+ // versions where the behavior is known.
+#if __cplusplus >= 201700L || \
+ __GLIBCXX__ >= 20150123L
+ C stack_resident;
+ ASSERT_THROW(stack_resident.shared_from_this(), std::bad_weak_ptr);
+ ASSERT_TRUE(stack_resident.weak_from_this().expired());
+#endif
+}