# std::jthread::swap

From cppreference.com
< cpp‎ | thread‎ | jthread

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

    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) (C++20) | specializes the std::swap algorithm (function)

Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/thread/jthread/swap&oldid=129259"