std::thread::id (3) - Linux Man Pages
Defined in header <thread>
class thread::id; (since C++11)
The class thread::id is a lightweight, trivially copyable class that serves as a unique identifier of std::thread objects.
Instances of this class may also hold the special distinct value that does not represent any thread. Once a thread has finished, the value of std::thread::id may be reused by another thread.
This class is designed for use as key in associative containers, both ordered and unordered.
constructor (public member function)
operator!= compares two thread::id objects
operator<< (function template)
std::hash<std::thread::id> (class template specialization)
get_id (public member function)
get_id returns the thread id of the current thread