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