Asio 定时器

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这几天看《Boost程序库完全开发指南》的第十二章有介绍Asio的使用方法，介绍很简单，只介绍了定时器、网络通信。下面对书中提到的定时器编程代码（

boost_async_timer_bind.cpp

）如下：

/*author:AlexChendate:2014/04/22#g++ -g -o main boost_async_timer_bind.cpp -lboost_system*/#define BOOST_REGEX_NO_LIB#define BOOST_DATE_TIME_SOURCE#define BOOST_SYSTEM_NO_LIB#include <boost/asio.hpp>#include <boost/date_time/posix_time/posix_time.hpp>#include <boost/function.hpp>#include <boost/bind.hpp>#include <iostream>using namespace std;using namespace boost;using namespace boost::asio;void SyncTimer(){io_service ios;deadline_timer t(ios,posix_time::seconds(2));cout<<t.expires_at()<<""<<time(NULL)<<endl;t.wait();cout<<"Hello!SyncTimer...."<<""<<time(NULL)<<endl;}void Print(const boost::system::error_code&){cout<<"Hello!AsyncTimer...."<<""<<time(NULL)<<endl;}void AsyncTimer(){io_service ios;deadline_timer t(ios,posix_time::seconds(2));cout<<t.expires_at()<<""<<time(NULL)<<endl;t.async_wait(Print);cout<<"It show before t expired..."<<""<<time(NULL)<<endl;ios.run();}class a_timer{private:int count;int count_max;function<void()> f;deadline_timer t;public:template<typename F>a_timer(io_service& ios,int x,F func):f(func),count_max(x),count(0),t(ios,posix_time::millisec(500)){t.async_wait(boost::bind(&a_timer::call_func,this,placeholders::error));}void call_func(const boost::system::error_code& e){if(count >= count_max){return;}++count;f();t.expires_at(t.expires_at() + posix_time::millisec(500));t.async_wait(boost::bind(&a_timer::call_func,this,placeholders::error));}};void Print1(){cout<<"Hello,Print1..."<<endl;}void Print2(){cout<<"Hello,Print2..."<<endl;}void TestBind(){io_service ios;a_timer at1(ios,5,Print1);a_timer at2(ios,5,Print2);ios.run();}int main(){cout<<endl<<"Test SyncTimer ...."<<endl;SyncTimer();cout<<endl<<"Test AsyncTimer ...."<<endl;AsyncTimer();cout<<endl<<"Test TestBind ...."<<endl;TestBind();cout<<endl<<"successful!..."<<endl;}

运行结果如下

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