I've built [CXXStateTree](https://github.com/ZigRazor/CXXStateTree), a modern C++ header-only library to create hierarchical state machines with clean, intuitive APIs.
It supports: - Deeply nested states - Entry/exit handlers - State transitions with guards and actions - Asynchronous transitions with `co_await` (C++20 coroutines) - Optional runtime type identification for flexibility
It's ideal for complex control logic, embedded systems, games, robotics, and anywhere you'd use a finite state machine.
I’d love feedback, use cases, or contributions from the community!