Perform a lexicographic three-way comparison of the specified lhs and the specified rhs pairs by using the comparison operators of T1 and T2; return the result of that comparison.
Declared in <bslstl_pair.h>
template<
class T1,
class T2>
constexpr
std::common_comparison_category_t<BloombergLP::bslalg::SynthThreeWayUtil::Result<T1>, BloombergLP::bslalg::SynthThreeWayUtil::Result<T2>>
operator<=>(
pair<T1, T2> const& lhs,
pair<T1, T2> const& rhs);