[英]Get elapsed time of std::future<T>::wait_for
如果没有发生超时,是否有一种简单的方法来获取std::future<T>::wait_for
时间? 我想要实现以下目标:
std::future<void> futureRet = std::async(std::launch::async, &Someone::doSomething, this);
futureRet.wait_for(std::chrono::seconds(30));
cout << "doSomething returned after <" << futureRet.getElapsedTime() << "> seconds.";
是否有一种“ getElapsedTime()”函数,或者我必须自己计算经过的时间?
使用<chrono>
有一个简单的方法:
auto start = std::chrono::steady_clock::now();
std::future<void> futureRet = std::async(std::launch::async, &Someone::doSomething, this);
futureRet.wait_for(std::chrono::seconds(30));
auto end = std::chrono::steady_clock::now();
std::chrono::duration<double> elapsed_seconds = end - start;
cout << "doSomething returned after <" << elapsed_seconds.count() << "> seconds.";
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