Show HN: CXXStateTree – A modern C++ library for hierarchical state machines

github.com

2 points by zigrazor 14 hours ago

Hi HN!

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!

Repo: https://github.com/ZigRazor/CXXStateTree

jeffreygoesto 14 hours ago

Nice and compact. I only wound have two nitpicks:

The Readme sais "zero heap allocations" but the code uses list and unordered map and moves, did you mean "zero allocations after state tree building"?

Also for embedded it would be useful to separate all in/out, dot export etc. to a second library that you can omit on small targets.

  • zigrazor 14 hours ago

    yes, it means "zero allocations after state tree building". Thank you for the suggestions, I think we could separate target with compilation switch. If you want you can open an issue on the repo. Thank you so much