在 C++ 中暂停程序执行 5 秒
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Pause program execution for 5 seconds in c++
提问by charlotte
I want to pause the execution of c++ program for 5 seconds. In android Handler.postDelayed has the required functionality what I am looking for. Is there anything similar to that in c++?
我想暂停 C++ 程序的执行 5 秒钟。在 android Handler.postDelayed 中具有我正在寻找的所需功能。在 C++ 中有类似的东西吗？
回答by const_ref
#include <iostream>
#include <chrono>
#include <thread>
int main()
{
std::cout << "Hello waiter" << std::endl;
std::chrono::seconds dura( 5);
std::this_thread::sleep_for( dura );
std::cout << "Waited 5s\n";
}
this_thread::sleep_forBlocks the execution of the current thread for at least the specified sleep_duration.
this_thread::sleep_for至少在指定的 sleep_duration 内阻止当前线程的执行。
回答by peterh - Reinstate Monica
You can to this on the pure C level, because C api calls are usable also from C++. It eliminiates the problem if you actual c++ library didn't contained the needed std:chronoor std::this_thread(they differs a little bit).
您可以在纯 C 级别进行此操作，因为 C api 调用也可从 C++ 使用。如果您实际的 C++ 库不包含所需的std:chrono或std::this_thread（它们略有不同），它就可以消除问题。
The C api of most OSes contains some like a sleeping function, although it can be also different. For example, on posixen, there is the sleep()API call in the standard C library, and you can use this from C++ as well:
大多数操作系统的 C api 包含一些类似于睡眠的功能，尽管它也可以不同。例如，在 posixen 上，sleep()标准 C 库中有API 调用，您也可以在 C++ 中使用它：
#include <unistd.h>
int main() {
sleep(5);
return;
}
Or you can use usleep()is you want a better precision as seconds. usleep()can sleep for microsecond precision.
或者你可以使用usleep()你想要更好的精度作为秒。usleep()可以休眠微秒精度。
On windows, you can use the Sleep(int usec)call, which is with big 'S', and uses milliseconds.
在 Windows 上，您可以使用Sleep(int usec)带有大 ' S' 并使用毫秒的调用。
