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

Apply the specified `visitor` to this variant by passing the value this variant currently holds to the `visitor` object's `operator()`, and return the value (of template parameter `RET_TYPE`) returned by the `visitor`. If this variant is unset, a default constructed `bslmf::Nil` is passed to the `visitor`.

== 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;
----


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