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!
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.
There may be no heap at all and memory must be pre-allocated at system initialization. Otherwise CXXStateTree sounds like it could be very useful in my Embedded devices, which rarely have enough Flash or RAM space, which is the nature of the work.