ros2 / ros2/rclcpp

Should rclcpp::Parameter throw if trying to stringify an unset parameter?

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@brawner is already working on this.

Since Sep 29, 2020.

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Description

This is a follow-up issue to a comment left by @clalancette over at https://github.com/ros2/rclcpp/pull/1344.

Currently rclcpp::Parameter will convert an unset parameter into a string if requested (either by to_string or using the << operator). Should this be expected or should it throw some sort of exception?

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