[#BloombergLP-bslstl-Variant_FunctionId]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::Variant&lowbar;FunctionId
:relfileprefix: ../../
:mrdocs:

Component&hyphen;private vtable entry invoking a tagged visitor on alternative `t&lowbar;INDEX`&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;
    class t&lowbar;RET,
    class t&lowbar;VISITOR,
    class t&lowbar;VARIANT,
    size&lowbar;t t&lowbar;INDEX&gt;
struct Variant&lowbar;FunctionId;
----

== Static Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/Variant_FunctionId/functionImpl.adoc[`functionImpl`] 
| Invoke `visitor` with an index tag and the active alternative&period;
|===



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