C++如何计算代码执行耗时_C++ 代码执行耗时计算方法

#include <iostream>
#include <chrono>
<p>int main() {
// 记录开始时间
auto start = std::chrono::high_resolution_clock::now();</p><pre class='brush:php;toolbar:false;'>// 要测量的代码段
for (int i = 0; i < 1000000; ++i) {
    // 模拟一些操作
}

// 记录结束时间
auto end = std::chrono::high_resolution_clock::now();

// 计算耗时（微秒）
auto duration = std::chrono::duration_cast<std::chrono::microseconds>(end - start);

std::cout << "耗时: " << duration.count() << " 微秒" << std::endl;

return 0;

struct Timer {
    std::chrono::time_point<std::chrono::high_resolution_clock> start;
<pre class='brush:php;toolbar:false;'>Timer() { start = std::chrono::high_resolution_clock::now(); }

void reset() { start = std::chrono::high_resolution_clock::now(); }

long long elapsed_microseconds() {
    auto now = std::chrono::high_resolution_clock::now();
    return std::chrono::duration_cast<std::chrono::microseconds>(now - start).count();
}

Timer t;
// 执行某些操作
std::cout << "耗时：" << t.elapsed_microseconds() << " 微秒\n";