[[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.
(none).
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.
#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
| represents the id of a thread (public member class of std::thread) |
|
| checks whether the thread is joinable, i.e. potentially running in parallel context (public member function) |
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