[#BloombergLP-bslstl-SetComparator-operator_call-04f]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/SetComparator.adoc[SetComparator]::operator()
:relfileprefix: ../../../
:mrdocs:

Return `true` if the specified `lhs` is less than (ordered before, according to the comparator held by this object) `value()` of the specified `rhs` after being cast to `NodeType`, and `false` otherwise&period; The behavior is undefined unless `rhs` can be safely cast to `NodeType`&period;

== Synopsis

Declared in `&lt;bslstl&lowbar;setcomparator&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;class LOOKUP&lowbar;KEY&gt;
bool
operator()(
    LOOKUP&lowbar;KEY const& lhs,
    xref:BloombergLP/bslalg/RbTreeNode.adoc[bslalg::RbTreeNode] const& rhs);
----


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