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Showing content from https://cplusplus.com/reference/thread/this_thread/sleep_for/ below:

function

<thread>

std::this_thread::sleep_for 
template <class Rep, class Period>  void sleep_for (const chrono::duration<Rep,Period>& rel_time);

Sleep for time span

Blocks execution of the calling thread during the span of time specified by rel_time.

The execution of the current thread is stopped until at least rel_time has passed from now. Other threads continue their execution.



Parameters
rel_time
The time span after which the calling thread shall resume its execution.
Note that multi-threading management operations may cause certain delays beyond this.
duration is an object that represents a specific relative time.

Return value none

Example 
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// this_thread::sleep_for example
#include <iostream>       // std::cout, std::endl
#include <thread>         // std::this_thread::sleep_for
#include <chrono>         // std::chrono::seconds
 
int main() 
{
  std::cout << "countdown:\n";
  for (int i=10; i>0; --i) {
    std::cout << i << std::endl;
    std::this_thread::sleep_for (std::chrono::seconds(1));
  }
  std::cout << "Lift off!\n";

  return 0;
}

Output (after 10 seconds): 
countdown:
10
9
8
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5
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2
1
Lift off!


Exception safety If the type of rel_time never throws exceptions (like the instantiations of duration in header <chrono>), this function never throws exceptions (no-throw guarantee).

See also
yield
Yield to other threads (function)
sleep_until
Sleep until time point (function)

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