swap(std::jthread)

 

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std::jthread

Member functions

jthread::jthread

jthread::~jthread

jthread::operator=

Observers

jthread::joinable

jthread::get_id

jthread::native_handle

jthread::hardware_concurrency

Operations

jthread::join

jthread::detach

jthread::swap

Stop token handling

jthread::get_stop_source

jthread::get_stop_token

jthread::request_stop

Non-member functions

swap(std::jthread)

 

friendvoid 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.

Parameters

lhs, rhs

-

jthreads 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(){usingstd::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

See also

swap	swaps two jthread objects (public member function)