Bosco Siu

Provide API for logging with per-thread counters

1

This is an RFC for a feature to allow counting loggers to use thread-local variables. I'm writing task-based routines that spawn threads to repeatedly run a function or lambda. Currently...

Our [software](https://github.com/boscosiu/Whisker) uses Cartographer directly without ROS, so it utilizes the submaps API and the `mapping::NodeId` and `mapping::SubmapId` types extensively. This change adds `std::hash` specializations to these types so they...