Function ~ThreadLocal

tests/gtest/gtest.h:2025–2032

        default_factory_(new InstanceValueHolderFactory(value)) {}

  ~ThreadLocal() {
    // Destroys the managed object for the current thread, if any.
    DeleteThreadLocalValue(pthread_getspecific(key_));

    // Releases resources associated with the key.  This will *not*
    // delete managed objects for other threads.
    GTEST_CHECK_POSIX_SUCCESS_(pthread_key_delete(key_));
  }

  T* pointer() { return GetOrCreateValue(); }
  const T* pointer() const { return GetOrCreateValue(); }