BoostStateChart实现状态机秒表例程

#include
#include #include // std::cout
#include // std::thread
#include <string>
#include
#include
#include
#include
#include event.hpp>
#include
#include
#include
#include #include using namespace std;
namespace sc &＃61; boost::statechart;class EvStartStop : public sc::event
{
};
class EvReset : public sc::event
{
};/*虚类&＃xff0c;用于状态机获取状态*/
class IElapsedTime
{public:virtual double elapsedTime() const &＃61; 0;virtual ~IElapsedTime(){};
};class Active;
/*秒表&＃xff0c;状态机*/
class StopWatch : public sc::state_machine
{public:double elapsedTime() const{return state_cast<const IElapsedTime &>().elapsedTime();}
};class Stopped;
/*活动状态*/
class Active : public IElapsedTime, public sc::state
{public:typedef sc::transition reactions;Active(my_context ctx): my_base(ctx),elapsed_time_(0){cout <<"Entry Active" << endl;}~Active(){cout <<"Exit Active" << endl;}double elapsedTime() const{return elapsed_time_;}double& elapsedTime(){return elapsed_time_;}private:double elapsed_time_;
};/*计时状态*/
class Running : public IElapsedTime, public sc::state
{public:typedef sc::transition reactions;Running(my_context ctx): my_base(ctx),start_time_(std::time(0)){cout <<"Entry Running" << endl;}~Running(){context().elapsedTime() &＃61; elapsedTime();cout <<"Exit Running" << endl;}virtual double elapsedTime() const{return context().elapsedTime()&＃43; std::difftime(std::time(0), start_time_);}private:std::time_t start_time_;
};/*停止状态*/
class Stopped : public IElapsedTime, public sc::state
{public:typedef sc::transition reactions;Stopped(my_context ctx): my_base(ctx){cout <<"Entry Stopped" << endl;}~Stopped(){cout <<"Exit Stopped" << endl;}virtual double elapsedTime() const{return context().elapsedTime();}};int main(int argc, char** argv)
{StopWatch myWatch;myWatch.initiate();cout <<"---" << endl;myWatch.process_event(EvStartStop());for(int i &＃61; 0; i <10; i&＃43;&＃43;){boost::this_thread::sleep(boost::posix_time::seconds(1)); //休眠1秒std::cout <<"time:" <"\n";}myWatch.process_event(EvStartStop());boost::this_thread::sleep(boost::posix_time::seconds(1));std::cout <<"current time:" <"\n";cout <<"---" << endl;myWatch.process_event(EvReset());std::cout <<"reset time:" <"\n";cout <<"---" << endl;return 0;
}

Entry Active
Entry Stopped
---
Exit Stopped
Entry Running
time:1
time:2
time:3
time:4
time:5
time:6
time:7
time:8
time:9
time:10
Exit Running
Entry Stopped
current time:10
---
Exit Stopped
Exit Active
Entry Active
Entry Stopped
reset time:0
---
Exit Stopped
Exit Active