[ROS2] Making rclcpp::Publisher a template class [closed]

edit

Is it possible to do that? Like

template <typename T>
class CustomerPublisher : public rclcpp::Node
{
   ...
   typename rclcpp::Publisher<T>::SharedPtr publisher_;
}

I tried it and instantiate a CustomerPublisher<std_msgs::msg::String>. It is able to compile, but got the following error

...undefined reference to `CustomerPublisher<std_msgs::msg::String_<std::allocator<void> > >::publish(std_msgs::msg::String_<std::allocator<void> >)'