[#BloombergLP-bdlb-operator_lt-0fe]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::operator<
:relfileprefix: ../../
:mrdocs:

Return `true` if the specified `lhs` nullable wrapper is ordered before the specified `rhs` nullable object, and `false` otherwise. `lhs` is ordered before `rhs` if `lhs` is null and `rhs` is non‐null or if both are non‐null and `lhs.value()` is ordered before `rhs.value()`. Note that this function will fail to compile if `LHS_TYPE` and `RHS_TYPE` are not compatible.

== Synopsis

Declared in `<bdlb_nullablevalueref.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class LHS_TYPE,
    class RHS_TYPE>
bool
operator<(
    xref:BloombergLP/bdlb/ConstNullableValueRef.adoc[ConstNullableValueRef<LHS_TYPE>] const& lhs,
    xref:BloombergLP/bdlb/NullableValueRef.adoc[NullableValueRef<RHS_TYPE>] const& rhs);
----


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