需要包含的头文件及类实现：

#include <chrono>
#include <thread>class Timer {
public:Timer() : m_StartTimepoint(std::chrono::high_resolution_clock::now()) {}~Timer() {Stop();}void Stop() {auto endTimepoint = std::chrono::high_resolution_clock::now();auto start = std::chrono::time_point_cast<std::chrono::nanoseconds>(m_StartTimepoint).time_since_epoch().count();auto end = std::chrono::time_point_cast<std::chrono::nanoseconds>(endTimepoint).time_since_epoch().count();auto duration = end - start;double ms = duration * 1.0e-6;std::cout << duration << "ns (" << ms << "ms)\n";}private:std::chrono::time_point<std::chrono::high_resolution_clock> m_StartTimepoint;
};

使用：

int main() {//第一个示例{printf("test1\n");Timer timer;// 你需要计时的代码for (int i = 0; i < 100; i++) {std::cout << "Hello, World!\n";}}//第二个示例{printf("test2\n");Timer timer;//std::this_thread::sleep_for(std::chrono::seconds(3)); //休眠三秒std::this_thread::sleep_for(std::chrono::milliseconds(100)); //休眠100毫秒}return 0;
}

结果：