swap(std::jthread)
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std::jthread
Member functions
Observers
Operations
Stop token handling
Non-member functions
swap(std::jthread)
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.
Contents
[edit] Parameters
lhs, rhs
-
jthreads whose states to swap
[edit] Return value
(none)
[edit] 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::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