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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