std::jthread::swap(3)

NAME
std::jthread::swap - std::jthread::swap

Synopsis
   void swap( std::jthread& other ) noexcept; (since C++20)
   Exchanges the underlying handles of two jthread objects.

Parameters
   other - the jthread to swap with

Return value
   (none)

Example
// Run this code
 #include <chrono>
 #include <iostream>
 #include <thread>
 void foo()
 {
     std::this_thread::sleep_for(std::chrono::seconds(1));
 }
 void bar()
 {
     std::this_thread::sleep_for(std::chrono::seconds(1));
 }
 int main()
 {
     std::jthread t1(foo);
     std::jthread t2(bar);
     std::cout << "thread 1 id: " << t1.get_id() << '\n'
               << "thread 2 id: " << t2.get_id() << '\n';
     std::swap(t1, t2);
     std::cout << "after std::swap(t1, t2):" << '\n'
               << "thread 1 id: " << t1.get_id() << '\n'
               << "thread 2 id: " << t2.get_id() << '\n';
     t1.swap(t2);
     std::cout << "after t1.swap(t2):" << '\n'
               << "thread 1 id: " << t1.get_id() << '\n'
               << "thread 2 id: " << t2.get_id() << '\n';
 }

Possible output:
 thread 1 id: 140185268262656
 thread 2 id: 140185259869952
 after std::swap(t1, t2):
 thread 1 id: 140185259869952
 thread 2 id: 140185268262656
 after t1.swap(t2):
 thread 1 id: 140185268262656
 thread 2 id: 140185259869952

See also
   swap(std::jthread) specializes the std::swap algorithm
   (C++20) (function)