std::this_thread::get_id

< cpp‎ | thread
Defined in header <thread>
std::thread::id get_id() noexcept;
 (since C++11)

Returns the id of the current thread.

Parameters

(none)

Return value

id of the current thread

Example

#include <chrono>
#include <iostream>
#include <syncstream>
#include <thread>
using namespace std::chrono_literals;
 
void foo()
{
    std::thread::id this_id = std::this_thread::get_id();
 
    std::osyncstream(std::cout) << "thread " << this_id << " sleeping...\n";
 
    std::this_thread::sleep_for(500ms);
}
 
int main()
{
    std::jthread t1 {foo};
    std::jthread t2 {foo};
}

Possible output:

thread 140113018054400 sleeping...
thread 140113009661696 sleeping...

See also

 returns the id of the thread
(public member function of std::thread)