Method ~Impl

cpp/src/arrow/testing/gtest_util.cc:693–693

      : signum_(signum), old_handler_(*internal::SetSignalHandler(signum, handler)) {}

  ~Impl() { ARROW_EXPECT_OK(internal::SetSignalHandler(signum_, old_handler_)); }
};

SignalHandlerGuard::SignalHandlerGuard(int signum, Callback cb)