last_event_id() returned a reference to a string that run_event_loop() assigns on its own thread under start_async(), so a caller reading it from another thread raced the writes. The member is now guarded by a mutex and the getter returns a copy.
The return type changes from const std::string & to std::string. Code that binds the result to a const reference or copies it still compiles.
metsw24-max
2f8b9f6f57
