Three-way comparison operators
Declared in <bslalg_dequeiterator.h>
Perform a three-way comparison between the specified lhs and rhs iterators. The behavior is undefined unless lhs and rhs are iterators over the same deque.
auto
operator<=>(
DequeIterator const& lhs,
DequeIterator const& rhs);Return the result of comparing the block pointers of the specified lhs and rhs iterators.
auto
operator<=>(
DequeIterator const& lhs,
DequeIterator const& rhs);