[C++知识库]c++ boost 状态机简单case：模拟下载文件

?也算备忘录吧，看了一段时间的状态机，记录一下

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#include <iostream>
#include <boost/statechart/state_machine.hpp>
#include <boost/statechart/simple_state.hpp>
#include <boost/statechart/transition.hpp>
#include <boost/statechart/custom_reaction.hpp>
using namespace std;
namespace sc = boost::statechart;
namespace mpl = boost::mpl;
#define LOG cout<<endl<<__func__<<":"
//事件&状态定义
struct State_Gloabl; //全局的入口
struct State_Begin;
struct Event_GetUrl : sc::event<Event_GetUrl>{};
struct State_Init;
struct Event_StartDeal : sc::event<Event_StartDeal>{};
struct State_Deal;
struct Event_KeepDeal : sc::event<Event_KeepDeal>{};
struct Event_DealDone : sc::event<Event_DealDone>{};
struct State_End;

string url="";
int32_t process = 0;
//事件->状态的具体实现
struct State_Gloabl : sc::state_machine<State_Gloabl, State_Begin>{
    State_Gloabl(){}
};
struct State_Begin : sc::simple_state<State_Begin, State_Gloabl>{
    typedef sc::transition<Event_GetUrl, State_Init> reactions; 

    State_Begin(){
        LOG<<"开始处理";
    }
};
struct State_Init : sc::simple_state<State_Init, State_Gloabl>{
    typedef sc::transition<Event_StartDeal, State_Deal> reactions; 

    State_Init(){
        LOG<<"请输入url:";
        cin >> url;
    }
};
struct State_Deal : sc::simple_state<State_Deal, State_Gloabl>{
    typedef mpl::list<
        sc::transition<Event_KeepDeal, State_Deal>,
        sc::transition<Event_DealDone, State_End>
    > reactions;
    State_Deal(){
        LOG<<"开始处理，当前进度:"<<process;
    }
};
struct State_End : sc::simple_state<State_End, State_Gloabl>{
    State_End(){
        LOG<<"处理结束";
    }
};

 
/**/
int main()
{
    State_Gloabl myMachine;
    // 构造完状态机后，它并未开始运行。我们要通过调用它的initiate()来启动它。
    // 同时，它也将触发它的初始状态的构造。
    myMachine.initiate();
    myMachine.process_event(Event_GetUrl());
    myMachine.process_event(Event_StartDeal());
    for(auto i = 0;i<100; i++){
        usleep(500);
        process++;
        if(i == 99){
            myMachine.process_event(Event_DealDone());
        }
        myMachine.process_event(Event_KeepDeal());
    }

    return 0;
}