[#BloombergLP-bdlb-VariantImp-apply-06b]
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:mrdocs:

Apply the specified `visitor` to this variant by passing the value this variant currently holds to the `visitor` object's `operator()`. This method does not return a value. If this variant is unset, a default constructed `bslmf::Nil` is passed to the `visitor`. Note that this method is selected only if the template parameter type `VISITOR` does not define a `typedef` of `ResultType` in its public interface. Also note that this method is defined inline to work around a Windows compiler bug with SFINAE functions.

== Synopsis

Declared in `<bdlb_variant.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class VISITOR>
void
apply(VISITOR const& visitor) const
requires Variant_ReturnValueHelper<VISITOR>::value == 0;
----


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