# operator==,!=,<,<=,>,>=,<=>(std::thread::id)

From cppreference.com
< cpp‎ | thread‎ | thread‎ | id

Defined in header `<thread>` |  |
bool operator==( std::thread::id lhs, std::thread::id rhs ) noexcept; | (1) | (since C++11)
bool operator!=( std::thread::id lhs, std::thread::id rhs ) noexcept; | (2) | (since C++11) (until C++20)
bool operator< ( std::thread::id lhs, std::thread::id rhs ) noexcept; | (3) | (since C++11) (until C++20)
bool operator<=( std::thread::id lhs, std::thread::id rhs ) noexcept; | (4) | (since C++11) (until C++20)
bool operator> ( std::thread::id lhs, std::thread::id rhs ) noexcept; | (5) | (since C++11) (until C++20)
bool operator>=( std::thread::id lhs, std::thread::id rhs ) noexcept; | (6) | (since C++11) (until C++20)
std::strong_ordering operator<=>( std::thread::id lhs, std::thread::id rhs ) noexcept; | (7) | (since C++20)

Compares two thread identifiers.

1-2) Checks whether `lhs` and `rhs` represent either the same thread, or no thread.
3-7) Compares `lhs` and `rhs` in an unspecified total ordering.

The `<`, `<=`, `>`, `>=`, and `!=` operators are synthesized from operator<=> and operator== respectively. | (since C++20)

### Parameters

lhs, rhs | - | thread identifiers to compare

### Return value

1-6) true if the corresponding relation holds, `false` otherwise.
7) std::strong_ordering::less if `lhs` is less than `rhs` in the total ordering; otherwise std::strong_ordering::greater if `rhs` is less than `lhs` in the total ordering; otherwise std::strong_ordering::equal.

### Complexity

Constant.

### See also

Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/thread/thread/id/operator_cmp&oldid=128402"