friend void swap( jthread &lhs, jthread &rhs ) noexcept; | (since C++20) |
Overloads the std::swap algorithm for std::jthread. Exchanges the state of lhs with that of rhs. Effectively calls lhs.swap(rhs). This function is not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when std::jthread is an associated class of the arguments.
| lhs, rhs | - | jthreads whose states to swap |
(none).
#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()
{
using std::swap;
std::jthread t1(foo);
std::jthread 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';
}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
| swaps two jthread objects (public member function) |
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