boost::asio::steady_timer基础使用

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看到书上说，boost::asio::deadline_timer是asio早期版本提供的定时器，使用boost.date_time库提供时间支持。貌似deadline_timer会被逐渐淘汰。所以学了一下更符合C++标准的steady_timer，

//boost::posix_time::to_simple_string函数需要这两个头文件#include <boost/date_time.hpp>#include <boost/date_time/posix_time/ptime.hpp>//使用boost.chrono代替std.chrono,#define BOOST_ASIO_DISABLE_STD_CHRONO#include <boost/asio.hpp>#include <boost/asio/steady_timer.hpp>#include <boost/asio/placeholders.hpp>#include <boost/thread.hpp>class MyClass{public:    MyClass() :m_work(m_io), m_timer(m_io){}public:    boost::thread_group m_thgp;    boost::asio::io_service m_io;    boost::asio::io_service::work m_work;    boost::asio::steady_timer m_timer;public:    void Init()    {        boost::system::error_code errCode;        m_thgp.create_thread(boost::bind(&boost::asio::io_service::run, boost::ref(m_io), errCode));        std::cout << "Init_1, " << LocalTime() << std::endl;        m_timer.expires_from_now(boost::chrono::milliseconds(4000)); //设置过期时间长度#if 0        m_timer.expires_from_now(std::chrono::milliseconds(4000));#endif        std::cout << "Init_2, " << LocalTime() << std::endl;        m_timer.async_wait(boost::bind(&MyClass::Test, this, boost::asio::placeholders::error));//异步等待        std::cout << "Init_3, " << LocalTime() << std::endl;        //由Console可知, 函数立即返回了, 定时器的expires_from_now是由完成端口处理的    }    void Stop()    {        std::cout << "Stop_1, " << LocalTime() << std::endl;        m_timer.cancel();  // 取消所有handler        m_work.~work();        m_thgp.join_all();        std::cout << "Stop_2, " << LocalTime() << std::endl;    }    static std::string LocalTime()    {        return boost::posix_time::to_simple_string(boost::posix_time::microsec_clock::local_time());    }    void Test(const boost::system::error_code& ec)    {        printf("test_1, %s, ec.value=%d, ec.message=%s\n", LocalTime().c_str(), ec.value(), ec.message().c_str());        if (ec)  return;        m_timer.expires_from_now(boost::chrono::milliseconds(4000));#if 0        m_timer.expires_from_now(std::chrono::milliseconds(4000));#endif        std::cout << "test_2, " << LocalTime() << std::endl;        m_timer.async_wait(boost::bind(&MyClass::Test, boost::ref(*this), _1));#if 0        m_timer.async_wait(boost::bind(&MyClass::Test, this, _1));        m_timer.async_wait(boost::bind(&MyClass::Test, this, boost::asio::placeholders::error));#endif        std::cout << "test_3, " << LocalTime() << std::endl;    }};int main(int argc, char** argv){    MyClass my;    my.Init();    for (int i = 0; i < 30; ++i)    {        boost::this_thread::sleep_for(boost::chrono::milliseconds(1000));    }    my.Stop();    std::cout << "press ENTER to exit..." << std::endl;    std::cin.sync();    while (getchar() != '\n') {}}

完。

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