NAME¶

std::swap(std::thread) - std::swap(std::thread)

Synopsis¶

void swap( std::thread& lhs, std::thread& rhs ) noexcept; (since C++11)

Overloads the std::swap algorithm for std::thread. Exchanges the state of lhs with
that of rhs. Effectively calls lhs.swap(rhs).

Parameters¶

lhs, rhs - threads whose states to swap

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()
{
using std::swap;

std::thread t1(foo);
std::thread t2(bar);

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

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';

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

See also¶

swap swaps two thread objects
(public member function)