c++11 时间相关操作练习

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// TimeTest.cpp: 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <chrono>
#include <typeinfo>
#include <iostream>
#include <thread>
#include <iomanip>
#include <ctime>

#include "Timer.h"

using namespace std;

void func1()
{
    std::this_thread::sleep_for(std::chrono::milliseconds(100));
    std::this_thread::sleep_for(std::chrono::seconds(1));
    //std::this_thread::sleep_for(std::chrono::minutes(1));

    std::chrono::milliseconds ms{ 3 };        //   3毫秒
    std::chrono::microseconds us = 2 * ms;  //6000微秒 
    std::chrono::duration<double, std::ratio<1, 30>> hz30{ 3.5 };

    std::cout << "3 ms duration has " << ms.count() << " ticks\n "
        << "6000 us duration has " << us.count() << " ticks\n";
}

void func2()
{
    std::chrono::minutes t1(10);
    std::chrono::seconds t2(60);

    std::chrono::seconds t3 = t1 - t2;
    std::cout << t3.count() << "second" << std::endl;
}

void TestChrono()
{
    std::chrono::duration<double, std::ratio<9, 7>> d1(3);
    std::chrono::duration<double, std::ratio<6, 5>> d2(1);

    auto d3 = d1 - d2;
    std::cout << typeid(d3).name() << std::endl;

    std::cout << d3.count() << std::endl;
}

void func3()
{
    using namespace std::chrono;

    typedef duration<int, std::ratio<60 * 60 * 24>> days_type;
    time_point<system_clock, days_type> today = time_point_cast<days_type>(system_clock::now());

    std::cout << today.time_since_epoch().count() << " days since epoch " << std::endl;
    return;
}

void func4()
{
    //用于写入数据库mysql
    using namespace std::chrono;
    system_clock::time_point now = system_clock::now();
    std::time_t last = system_clock::to_time_t(now - hours(24));
    std::time_t next = system_clock::to_time_t(now + hours(24));

    struct tm t;
    localtime_s(&t, &last);
    std::cout << "One day ago, the time was "
        << std::put_time(&t, "%F %T") << "\n";

    localtime_s(&t, &next);
    std::cout << "Next day , the time was "
        << std::put_time(&t, "%F %T") << "\n";
}


int main()
{
    Timer timer;
    system_clock::time_point now = system_clock::now();
    std::time_t nowtime = system_clock::to_time_t(now);

    struct tm t;
    localtime_s(&t, &nowtime);
    std::cout << "before "
        << std::put_time(&t, "%F %T") << "\n";


    while (1) {
        if (timer.elapsed_minutes() > 3) {
            std::cout <<" break"<<std::endl;
            break;
        }
        std::this_thread::sleep_for(std::chrono::seconds(1));
    }

    now = system_clock::now();
    nowtime = system_clock::to_time_t(now);

    localtime_s(&t, &nowtime);
    std::cout << "after "
        << std::put_time(&t, "%F %T") << "\n";
    
    return 0;
}

#pragma once
#include <chrono>

using namespace std;
using namespace std::chrono;

class Timer
{
public:
    Timer() :m_begin(high_resolution_clock::now()) {};
    void reset() { m_begin = high_resolution_clock::now(); }

    //默认输出毫秒
    template<typename Duration = milliseconds>
    int64_t elapsed()const {
        return duration_cast<Duration>(high_resolution_clock::now() - m_begin).count();
    }

    //微秒
    int64_t elapsed_micro()const {
        return elapsed<microseconds>();
    }

    //纳秒
    int64_t elapsed_nano()const
    {
        return elapsed<nanoseconds>();
    }
    //秒
    int64_t elapsed_seconds()const
    {
        return elapsed<seconds>();
    }
    //分
    int64_t elapsed_minutes()const
    {
        return elapsed<minutes>();
    }
    //时
    int64_t elapsed_hours()const
    {
        return elapsed<hours>();
    }
private:
    time_point<high_resolution_clock> m_begin;
};