1 使用std::chrono计算程序运行时间

参考代码如下：

#include <iostream>
#include <string>
#include <chrono>

void Run()
{
    for (int i = 0; i < 1000000000; ++i)
    {

    }

}

int main()
{
    auto beforeTime = std::chrono::steady_clock::now();

    Run();

    auto afterTime = std::chrono::steady_clock::now();

    std::cout << "总耗时:" << std::endl;
    //秒
    double duration_second = std::chrono::duration<double>(afterTime - beforeTime).count();
    std::cout << duration_second << "秒" << std::endl;

    //毫秒级
    double duration_millsecond = std::chrono::duration<double, std::milli>(afterTime - beforeTime).count();
    std::cout << duration_millsecond << "毫秒" << std::endl;

    //微妙级
    double duration_microsecond = std::chrono::duration<double, std::micro>(afterTime - beforeTime).count();
    std::cout << duration_microsecond << "微秒" << std::endl;

    //纳秒级
    double duration_nanosecond = std::chrono::duration<double, std::nano>(afterTime - beforeTime).count();
    std::cout << duration_nanosecond << "纳秒" << std::endl;

    getchar();
    return 0;
}

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