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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../thread/jthread/get_id.html below:

std::jthread::get_id - cppreference.com

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.

[edit] Parameters

(none)

[edit] 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.

[edit] Example

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

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