C++计时类封装 #include <Windows.h> //#include <ctime> class stop_watch { public: stop_watch() : elapsed_(0) { QueryPerformanceFrequency(&freq_); } ~stop_watch() {} public: void start() { QueryPerformanceCounter(&begin_time_); } void stop() { LARGE_INTEGER end_time; QueryPerformanceCounter(&end_time); elapsed_ += (end_time.QuadPart - begin_time_.QuadPart) * 1000000 / freq_.QuadPart; } void restart() { elapsed_ = 0; start(); } //微秒 double elapsed() { return static_cast<double>(elapsed_); } //毫秒 double elapsed_ms() { return elapsed_ / 1000.0; } //秒 double elapsed_second() { return elapsed_ / 1000000.0; } private: LARGE_INTEGER freq_; LARGE_INTEGER begin_time_; long long elapsed_; };