[#BloombergLP-bslstl-Variant_FunctionId]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::Variant_FunctionId
:relfileprefix: ../../
:mrdocs:

Component‐private vtable entry invoking a tagged visitor on alternative `t_INDEX`.

== Synopsis

Declared in `<bslstl_variant.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class t_RET,
    class t_VISITOR,
    class t_VARIANT,
    size_t t_INDEX>
struct Variant_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.
|===



[.small]#Created with https://www.mrdocs.com[MrDocs]#