Method ~ExtensionTypeGuard

cpp/src/arrow/testing/gtest_util.cc:1066–1070

}

ExtensionTypeGuard::~ExtensionTypeGuard() {
  for (const auto& name : extension_names_) {
    ARROW_CHECK_OK(UnregisterExtensionType(name));
  }
}

class GatingTask::Impl : public std::enable_shared_from_this<GatingTask::Impl> {
 public: