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# std::thread::id

From cppreference.com
< cpp‎ | thread‎ | thread

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.

### [edit] Member functions

(constructor) | constructs an id that does not represent a thread (public member function)

### [edit] Non-member functions

operator==operator!=operator< operator<= operator> operator>= | compares two `thread::id` objects (function) [edit]
operator<< | serializes a `thread::id` object (function template) [edit]

### [edit] Helper classes

std::hash<std::thread::id> | specializes std::hash (class template specialization)

### [edit] See also

get_id (C++11) | returns the id of the thread (public member function) [edit]
get_id (C++11) | returns the thread id of the current thread (function) [edit]

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