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

This component‐private function invokes the specified `visitor` with a `bsl::in_place_index_t` tag representing the value of (template parameter) `t_INDEX` and the active alternative object of the specified `variant`, implicitly converting the return type to (template parameter) `t_RET`. The behavior is undefined unless `t_INDEX` is the index of the active alternative.

== Synopsis

Declared in `<bslstl_variant.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
t_RET
functionImpl(
    t_VISITOR&& visitor,
    t_VARIANT&& variant);
----


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