一个很有代表性的boost状态机实例

#include <boost/statechart/event.hpp>#include <boost/statechart/state_machine.hpp>#include <boost/statechart/simple_state.hpp>#include <boost/statechart/transition.hpp>#include <iostream>namespace sc = boost::statechart;struct Event1 : sc::event<Event1>{};struct Event2 : sc::event<Event2>{};struct SimpleState1;struct StateMachine1 : sc::state_machine<StateMachine1, SimpleState1>{StateMachine1(void){std::cout << "construct StateMachine1" << std::endl;}~StateMachine1(void){std::cout << "distruct StateMachine1" << std::endl;}};struct SimpleState1_1;struct SimpleState1 : sc::simple_state<SimpleState1, StateMachine1, SimpleState1_1>{typedef sc::transition<Event1, SimpleState1> reactions;SimpleState1(void){std::cout << "enter SimpleState1" << std::endl;}~SimpleState1(void){std::cout << "leave SimpleState1" << std::endl;}};struct SimpleState1_2;struct SimpleState1_1 : sc::simple_state<SimpleState1_1, SimpleState1>{typedef sc::transition<Event2, SimpleState1_2> reactions;SimpleState1_1(void){std::cout << "enter SimpleState1_1" << std::endl;}~SimpleState1_1(void){std::cout << "leave SimpleState1_1" << std::endl;}};struct SimpleState1_2 : sc::simple_state<SimpleState1_2, SimpleState1>{typedef sc::transition<Event2, SimpleState1_1> reactions;SimpleState1_2(void){std::cout << "enter SimpleState1_2" << std::endl;}~SimpleState1_2(void){std::cout << "leave SimpleState1_2" << std::endl;}};int main(int argc, char ** argv){StateMachine1 myMachine;myMachine.initiate();std::cout << "----- before process Event2" << std::endl;myMachine.process_event(Event2());std::cout << "----- after process Event2" << std::endl;std::cout << "----- before process Event1" << std::endl;myMachine.process_event(Event1());std::cout << "----- after process Event1" << std::endl;return 0;}

运行结果

construct StateMachine1enter SimpleState1enter SimpleState1_1----- before process Event2leave SimpleState1_1enter SimpleState1_2----- after process Event2----- before process Event1leave SimpleState1_2leave SimpleState1enter SimpleState1enter SimpleState1_1----- after process Event1distruct StateMachine1leave SimpleState1_1leave SimpleState1请按任意键继续. . .