std::thread_id - Man Page

id (native_handle_type __id)

struct hash< id >
template<class _CharT , class _Traits > basic_ostream< _CharT, _Traits > & operator<< (basic_ostream< _CharT, _Traits > &__out, id __id)
strong_ordering operator<=> (id __x, id __y) noexcept
bool operator== (id __x, id __y) noexcept
class thread

(Note that these are not member symbols.)

bool operator== (thread::id __x, thread::id __y) noexcept

strong_ordering operator (thread::id __x, thread::id __y) noexcept
template<class _CharT , class _Traits > basic_ostream< _CharT, _Traits > & operator<< (basic_ostream< _CharT, _Traits > &__out, thread::id __id)