A header-only C++ FSM library.
- Zero dependencies
cmake -B build -DCMAKE_BUILD_TYPE=Release -S .
cmake --build build --config Release
ctest --test-dir build --build-config Release --output-on-failure#include "fsm.hpp"
#include <iostream>
#include <string>
enum class State {
State0,
State1,
State2
};
enum class Event {
Event1,
Event2
};
static std::string StateToString(const State &state) {
switch (state) {
case State::State0:
return "State0";
case State::State1:
return "State1";
case State::State2:
return "State2";
}
return "Unknown";
}
namespace Action {
const auto Action1{[]() { std::cout << "Action1" << std::endl; }};
const auto Action2{[]() { std::cout << "Action2" << std::endl; }};
} // namespace Action
namespace Guard {
const auto Guard1{[]() { return true; }};
const auto Guard2{[]() { return true; }};
const auto Guard3{[]() { return false; }};
} // namespace Guard
int main() {
const fsm::TransitionTable<State, Event> transitionTable{
{{State::State0, Event::Event1}, {Guard::Guard1, Action::Action1, State::State1}},
{{State::State1, Event::Event2}, {Guard::Guard2, Action::Action2, State::State2}},
{{State::State2, Event::Event1}, {Guard::Guard3, Action::Action1, State::State1}},
};
fsm::FiniteStateMachine<State, Event> sm(State::State0, transitionTable);
std::cout << StateToString(sm.GetState()) << std::endl;
sm.SetEnterAction(State::State1, []() { std::cout << "EnterAction1" << std::endl; });
sm.SetLeaveAction(State::State1, []() { std::cout << "LeaveAction1" << std::endl; });
sm.HandleEvent(Event::Event1);
std::cout << StateToString(sm.GetState()) << std::endl;
sm.HandleEvent(Event::Event2);
std::cout << StateToString(sm.GetState()) << std::endl;
sm.HandleEvent(Event::Event1);
std::cout << StateToString(sm.GetState()) << std::endl;
return 0;
}State0
Action1
EnterAction1
State1
LeaveAction1
Action2
State2
State2