[#BloombergLP-bdlb-operator_3way-03]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::operator<=>
:relfileprefix: ../../
:mrdocs:

Return a three‐way comparison of the specified `lhs` and `rhs`.

== 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:BloombergLP/bdlb/NullableValue.adoc[NullableValue<RHS_TYPE>] const& rhs);
----

== Description

Perform a three‐way comparison of the specified `lhs` and the specified `rhs` objects by using the comparison operators of `t_LHS` and `t_RHS`; return the result of that comparison.

== Return Value

the result of the three‐way comparison

== Parameters

[cols="1,4"]
|===
| Name| Description
| *lhs*
| left‐hand operand
| *rhs*
| right‐hand operand
|===


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