NAME¶

std::jthread::get_id - std::jthread::get_id

Synopsis¶

[[nodiscard]] std::jthread::id get_id() const noexcept; (since C++20)

Returns a value of std::jthread::id (which is a type alias for std::thread::id)
identifying the thread associated with *this.

Parameters¶

(none)

Return value¶

A value of type std::jthread::id identifying the thread associated with *this. If
there is no thread associated, default constructed std::jthread::id is returned.

Example¶

// Run this code

#include <chrono>
#include <iostream>
#include <thread>

void foo()
{
std::this_thread::sleep_for(std::chrono::seconds(1));
}

int main()
{
std::jthread t1(foo);
std::jthread::id t1_id = t1.get_id();

std::jthread t2(foo);
std::jthread::id t2_id = t2.get_id();

std::cout << "t1's id: " << t1_id << '\n';
std::cout << "t2's id: " << t2_id << '\n';

t1.join();
t2.join();

std::cout << "t1's id after join: " << t1.get_id() << '\n';
std::cout << "t2's id after join: " << t2.get_id() << '\n';
}

Possible output:¶

t1's id: 140146221688576
t2's id: 140146213295872
t1's id after join: thread::id of a non-executing thread
t2's id after join: thread::id of a non-executing thread

See also¶

id represents the id of a thread
(public member class of std::thread)
checks whether the thread is joinable, i.e. potentially running in parallel
joinable context
(public member function)