[#BloombergLP-bdlb-operator_lt-032]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::operator<
:relfileprefix: ../../
:mrdocs:

Return `true` if `lhs` is ordered before `rhs`, and `false` otherwise.

== Synopsis

Declared in `<bdlb_nullablevalue.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class LHS_TYPE,
    class RHS_TYPE>
bool
operator<(
    xref:BloombergLP/bdlb/NullableValue.adoc[NullableValue<LHS_TYPE>] const& lhs,
    xref:bsl/optional-072.adoc[bsl::optional<RHS_TYPE>] const& rhs)
requires requires {
        { *lhs < *rhs } ‐> NullableValue_ConvertibleToBool;
    };
----


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