Top 11 C++ state-machine Projects

BehaviorTree.CPP

4 2,690 9.3 C++

Behavior Trees Library in C++. Batteries included.

Project mention: Coroutines make robot code easy for high schoolers | news.ycombinator.com | 2023-06-22

sml

23 1,072 6.8 C++

C++14 State Machine library

Project mention: Sharing Saturday #496 | /r/roguelikedev | 2023-12-08

Anyway the need is not complicated, I need both entry and exit functions from every state, optionally allowing these functions to be coroutines (that's special sauce but for later), and an explicit state transition table which also have a way to say that a state can be accessed at any point. Also allow states to be state machines, optional FSM hierarchies. If you ignore the coroutine stuff it's pretty standard features these days, except that - Boost.MSM is quite archaic now (it was so novel when it was first released...) although it allows most of the features I talked about, I just think it will complicate my code unneecessarilly; - Boost-Ext.SML (not Boost) is almost perfect except it doesnt have entry/exit functions on states for some reason. Also last time we (as in in livestream) tried it in prototypes it didnt compile on msvc XD - Boost-Ext.SML2 is even better but still doesnt have entry/exit functions although it's in the plans.

WorkOS

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HFSM2

3 434 5.0 C++

High-Performance Hierarchical Finite State Machine Framework

Project mention: State machine library for portable embedded application (C++11) | /r/embedded | 2023-06-08

qpcpp

1 351 6.5 C++

QP/C++ Real-Time Embedded Framework/RTOS for embedded systems based on active objects (actors) and hierarchical state machines
hsm

1 178 0.0 C++

Finite state machine library based on the boost hana meta programming library. It follows the principles of the boost msm and boost sml libraries, but tries to reduce own complex meta programming code to a minimum. (by erikzenker)
hsm

1 106 0.0 C++

C++ framework library to simplify state-driven code (by amaiorano)
hsmcpp

1 56 6.0 C++

C++ based Hierarchical / Finite State Machine library oriented for embedded and RTOS systems.

Project mention: State machine library for portable embedded application (C++11) | /r/embedded | 2023-06-08

Me and my team faced a similar issue since we often port code between different OS and frameworks (embedded automotive). Unfortunately, I couldn't find anything which fully satisfied our requirements so ended up creating an HSM library myself. You can see it on GitHub and check if it suits your needs: https://github.com/igor-krechetov/hsmcpp

InfluxDB

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compile-time-fsm

1 50 6.8 C++

A simple finite state machine, but without overhead!
UIState

2 11 2.6 C++

Cleanest way of representing UI state in a flutter widget.
MyButton_Arduino

2 9 0.0 C++

A push button debouncing and "enhancing" library for complex user interfaces.
roost_hsm

1 8 3.0 C++

A C++11 Hierarchical State Machine Library

Project mention: Show HN: A C++11 Hierarchical State Machine Library | news.ycombinator.com | 2023-08-08

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).