[#BloombergLP-bslstl-Variant_SwapVisitor-operator_call]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/Variant_SwapVisitor.adoc[Variant_SwapVisitor]::operator()
:relfileprefix: ../../../
:mrdocs:

Swap the alternative having index (template parameter) `t_INDEX` in `*d_variant_p` with the specified `value` (i.e. the alternative that is being visited). The behavior is undefined unless `t_INDEX` is the index of the active alternative of `*d_variant_p` (or, in C++03, the index of an alternative that has the same type as the active alternative).

== Synopsis

Declared in `<bslstl_variant.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    size_t t_INDEX,
    class t_TYPE>
void
operator()(
    bsl::in_place_index_t<t_INDEX>,
    t_TYPE& value) const;
----


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