Perform a three-way comparison of the specified nullable objects.
Declared in <bdlb_nullablevalue.h>
template<
class LHS_TYPE,
bsl::three_way_comparable_with<LHS_TYPE> RHS_TYPE>
constexpr
std::compare_three_way_result_t<LHS_TYPE, RHS_TYPE>
operator<=>(
NullableValue<LHS_TYPE> const& lhs,
std::optional<RHS_TYPE> const& rhs);