C++ 中使用不同平台的时间函数及对比分析

#include <iostream>
#include <chrono>
#include <thread>
int main() {
    // 获取当前时间点
    auto start = std::chrono::high_resolution_clock::now();
    // 模拟工作（例如，暂停 1 秒）
    std::this_thread::sleep_for(std::chrono::seconds(1));
    // 获取当前时间点
    auto end = std::chrono::high_resolution_clock::now();
    // 计算持续时间
    std::chrono::duration<double> duration = end - start;
    std::cout << "Duration: " << duration.count() << " seconds\n";
    return 0;
}

#include <iostream>
#include <windows.h>
int main() {
    SYSTEMTIME st;
    GetSystemTime(&st); // 获取系统时间（UTC 时间）
    std::cout << "System Time (UTC): " 
              << st.wYear << "-"
              << st.wMonth << "-"
              << st.wDay << " "
              << st.wHour << ":"
              << st.wMinute << ":"
              << st.wSecond << "."
              << st.wMilliseconds << "\n";
    GetLocalTime(&st); // 获取本地时间
    std::cout << "Local Time: " 
              << st.wYear << "-"
              << st.wMonth << "-"
              << st.wDay << " "
              << st.wHour << ":"
              << st.wMinute << ":"
              << st.wSecond << "."
              << st.wMilliseconds << "\n";
    return 0;
}

#include <iostream>
#include <windows.h>
int main() {
    LARGE_INTEGER frequency;
    LARGE_INTEGER start, end;
    // 获取高精度计时器的频率
    QueryPerformanceFrequency(&frequency);
    // 获取开始时间
    QueryPerformanceCounter(&start);
    // 模拟工作（例如，暂停 1 秒）
    Sleep(1000);
    // 获取结束时间
    QueryPerformanceCounter(&end);
    // 计算持续时间
    double duration = static_cast<double>(end.QuadPart - start.QuadPart) / frequency.QuadPart;
    std::cout << "High-resolution duration: " << duration << " seconds\n";
    return 0;
}

#include <iostream>
#include <sys/time.h>
int main() {
    struct timeval tv;
    gettimeofday(&tv, nullptr);
    std::cout << "Seconds: " << tv.tv_sec << "\n";
    std::cout << "Microseconds: " << tv.tv_usec << "\n";
    return 0;
}

#include <iostream>
#include <ctime>
int main() {
    struct timespec ts;
    clock_gettime(CLOCK_MONOTONIC, &ts);
    std::cout << "Seconds: " << ts.tv_sec << "\n";
    std::cout << "Nanoseconds: " << ts.tv_nsec << "\n";
    return 0;
}

#include <iostream>
#include <boost/chrono.hpp>
int main() {
    boost::chrono::high_resolution_clock::time_point start = boost::chrono::high_resolution_clock::now();
    // 模拟工作
    boost::this_thread::sleep_for(boost::chrono::seconds(1));
    boost::chrono::high_resolution_clock::time_point end = boost::chrono::high_resolution_clock::now();
    boost::chrono::duration<double> duration = end - start;
    std::cout << "Duration: " << duration.count() << " seconds\n";
    return 0;
}