[#BloombergLP-bslstl-Variant_OverloadHelper-0d-Index]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/Variant_OverloadHelper-0d.adoc[Variant&lowbar;OverloadHelper&lt;t&lowbar;SRC, bsl::variant&lt;t&lowbar;HEAD, t&lowbar;TAIL&period;&period;&period;&gt;, bsl::void&lowbar;t&lt;decltype(Variant&lowbar;OverloadSetImp&lt;t&lowbar;SRC, 0, t&lowbar;HEAD, t&lowbar;TAIL&period;&period;&period;&gt;&colon;&colon;
                             candidate(std&colon;&colon;declval&lt;t&lowbar;SRC&gt;()))&gt;&gt;]::Index
:relfileprefix: ../../../
:mrdocs:

Index constant equal to the index of the alternative selected by overload resolution among the `candidate` functions&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef decltype(Variant&lowbar;OverloadSetImp&lt;t&lowbar;SRC, 0, t&lowbar;HEAD, t&lowbar;TAIL&period;&period;&period;&gt;&colon;&colon;candidate(
            std&colon;&colon;declval&lt;t&lowbar;SRC&gt;())) Index;
----


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