C++11 时间相关操作

获取当前时间戳：

auto start_time = std::chrono::steady_clock::now();

获取时间跨度：

std::chrono::steady_clock::time_point start_ts = std::chrono::steady_clock::now();
std::chrono::steady_clock::time_point end_ts = std::chrono::steady_clock::now();

auto start = std::chrono::high_resolution_clock::now();
auto end = std::chrono::high_resolution_clock::now();
auto cost = std::chrono::duration_cast<std::chrono::milliseconds>(end-start).count();


uint32_t  time_span = std::chrono::duration_cast<std::chrono::microseconds>(end_ts - start_ts).count();

休眠函数：

std::this_thread::sleep_for(std::chrono::seconds(4)); //休眠4秒
std::this_thread::sleep_for(std::chrono:: milliseconds (150)); //休眠150毫秒