将c#秒表重写为c++

#include <iostream>
#include <chrono>

class Stopwatch {
private:
    std::chrono::high_resolution_clock::time_point start_time;
    std::chrono::high_resolution_clock::time_point end_time;
    bool running;

public:
    Stopwatch() : running(false) {}

    void Start() {
        if (!running) {
            start_time = std::chrono::high_resolution_clock::now();
            running = true;
        }
    }

    void Stop() {
        if (running) {
            end_time = std::chrono::high_resolution_clock::now();
            running = false;
        }
    }

    double ElapsedMilliseconds() {
        if (running) {
            std::chrono::high_resolution_clock::time_point current_time = std::chrono::high_resolution_clock::now();
            return std::chrono::duration<double, std::milli>(current_time - start_time).count();
        } else {
            return std::chrono::duration<double, std::milli>(end_time - start_time).count();
        }
    }
};

int main() {
    Stopwatch stopwatch;
    stopwatch.Start();

    // 执行需要计时的代码

    stopwatch.Stop();
    std::cout << "Elapsed time: " << stopwatch.ElapsedMilliseconds() << " milliseconds" << std::endl;

    return 0;
}