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# std::thread::swap

From cppreference.com
< cpp‎ | thread‎ | thread

void swap( thread& other ); |  | (since C++11)

Exchanges the underlying handles of two thread objects.

### [edit] Parameters

other | - | the thread to swap with

### [edit] Return value

(none)

### [edit] Exceptions

`noexcept` specification:
noexcept

### [edit] 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::thread t1(foo);
        std::thread t2(bar);

        std::cout << "thread 1 id: " << t1.get_id() << std::endl;
        std::cout << "thread 2 id: " << t2.get_id() << std::endl;

        std::swap(t1, t2);

        std::cout << "after std::swap(t1, t2):" << std::endl;
        std::cout << "thread 1 id: " << t1.get_id() << std::endl;
        std::cout << "thread 2 id: " << t2.get_id() << std::endl;

        t1.swap(t2);

        std::cout << "after t1.swap(t2):" << std::endl;
        std::cout << "thread 1 id: " << t1.get_id() << std::endl;
        std::cout << "thread 2 id: " << t2.get_id() << std::endl;

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

Possible output:

    thread 1 id: 1892
    thread 2 id: 2584
    after std::swap(t1, t2):
    thread 1 id: 2584
    thread 2 id: 1892
    after t1.swap(t2):
    thread 1 id: 1892
    thread 2 id: 2584

### [edit] See also

std::swap(std::thread) (C++11) | specializes the std::swap algorithm (function template) [edit]

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