Adam Huang

Results 2 issues of Adam Huang

Implement addition/subtraction assignment operators based on existing operators. Resolves #2399

enhancement

## Feature request I wonder if `rclcpp` could support add/minus time with `msg::Time` on the left as caller. In the current delivery, ``` C++ std_msgs::msg::Header header; header.stamp = rclcpp::Duration::from_seconds(1) +...

enhancement
help wanted