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

public member function

std::thread::detach

Detach thread

Detaches the thread represented by the object from the calling thread, allowing them to execute independently from each other.

Both threads continue without blocking nor synchronizing in any way. Note that when either one ends execution, its resources are released.

After a call to this function, the thread object becomes non-joinable and can be destroyed safely.

Parameters none

Return value none

Example

#include <iostream>       // std::cout
#include <thread>         // std::thread, std::this_thread::sleep_for
#include <chrono>         // std::chrono::seconds
 
void pause_thread(int n) 
{
  std::this_thread::sleep_for (std::chrono::seconds(n));
  std::cout << "pause of " << n << " seconds ended\n";
}
 
int main() 
{
  std::cout << "Spawning and detaching 3 threads...\n";
  std::thread (pause_thread,1).detach();
  std::thread (pause_thread,2).detach();
  std::thread (pause_thread,3).detach();
  std::cout << "Done spawning threads.\n";

  std::cout << "(the main thread will now pause for 5 seconds)\n";
  // give the detached threads time to finish (but not guaranteed!):
  pause_thread(5);
  return 0;
}

Output (after 5 seconds):

Spawning and detaching 3 threads...
Done spawning threads.
(the main thread will now pause for 5 seconds)
pause of 1 seconds ended
pause of 2 seconds ended
pause of 3 seconds ended
pause of 5 seconds ended

Data races The object is modified.

Exception safetyBasic guarantee: if an exception is thrown by this member function, the thread object is left in a valid state.

If the call fails, a system_error exception is thrown: