std::swap(std::thread)

1	`void` `swap(` `thread` `&lhs,` `thread` `&rhs );`

(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).

Exceptions

noexcept specification:

noexcept

Example

#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();
}

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

std::swap(std::thread)

Parameters

Return value

Exceptions

Example

See also