Specifically, absl (Google's C++ library already provides this guarantee). In general the idea is that they will provide backwards compatibility for 5 years, an

Specifically, absl (Google's C++ library already provides this guarantee). In general the idea is that they will provide backwards compatibility for 5 years, and provide tooling to update source code to new constructs. This is covered somewhere in this talk: https://www.youtube.com/watch?v=tISy7EJQPzI https://www.youtube.com/watch?v=tISy7EJQPzI