[#BloombergLP-bdlb-VariantImp-apply-0f6]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::xref:BloombergLP/bdlb/VariantImp.adoc[VariantImp]::apply
:relfileprefix: ../../../
:mrdocs:

Apply `visitor` to the held value and return `RET_TYPE`.

== Synopsis

Declared in `<bdlb_variant.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class RET_TYPE,
    class VISITOR>
RET_TYPE
apply(VISITOR& visitor) const;
----

== Description

If this variant is unset, a default constructed `bslmf::Nil` is passed to the `visitor`.

== Return Value

result of invoking `visitor` on the active alternative

== Parameters

[cols="1,4"]
|===
| Name| Description
| *visitor*
| callable applied to the active alternative
|===


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