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std::thread::get_id(3)	       C++ Standard Libary	  std::thread::get_id(3)

NAME
     std::thread::get_id - std::thread::get_id

Synopsis
	std::thread::id get_id() const noexcept;  (since C++11)

	Returns  a  value  of  std::thread::id identifying the thread associated
     with *this.

Parameters
	(none)

Return value
	A value of type std::thread::id identifying the thread	associated  with
     *this. If
	there  is  no  thread associated, default constructed std::thread::id is
     returned.

Example
     // Run this code

      #include <chrono>
      #include <iostream>
      #include <thread>

      void foo()
      {
	  std::this_thread::sleep_for(std::chrono::seconds(1));
      }

      int main()
      {
	  std::thread t1(foo);
	  std::thread::id t1_id = t1.get_id();

	  std::thread t2(foo);
	  std::thread::id t2_id = t2.get_id();

	  std::cout << "t1's id: " << t1_id << '\n';
	  std::cout << "t2's id: " << t2_id << '\n';

	  t1.join();
	  t2.join();

	  std::cout << "t1's id after join: " << t1.get_id() << '\n';
	  std::cout << "t2's id after join: " << t2.get_id() << '\n';
      }

Possible output:
      t1's id: 140146221688576
      t2's id: 140146213295872
      t1's id after join: thread::id of a non-executing thread
      t2's id after join: thread::id of a non-executing thread

See also
	id	 represents the id of a thread
		 (public member class)
		 checks whether the thread is joinable, i.e. potentially running
     in parallel
	joinable context
		 (public member function)

http://cppreference.com 	   2024.06.10		  std::thread::get_id(3)
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