[#BloombergLP-bdlb-operator_3way-04]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::operator<=>
:relfileprefix: ../../
:mrdocs:

Perform a three‐way comparison of the specified nullable objects.

== Synopsis

Declared in `<bdlb_nullablevalue.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
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<=>(
    xref:BloombergLP/bdlb/NullableValue.adoc[NullableValue<LHS_TYPE>] const& lhs,
    xref:bsl/optional-072.adoc[bsl::optional<RHS_TYPE>] const& rhs);
----


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