[#BloombergLP-bslstl-Variant_Union-0d-2constructor-05]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/Variant_Union-0d.adoc[Variant_Union<t_HEAD, t_TAIL...>]::Variant_Union
:relfileprefix: ../../../
:mrdocs:

Constructors

== Synopses

Declared in `<bslstl_variant.h>`

Create a `Variant_Union` object having no active alternative.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/bslstl/Variant_Union-0d/2constructor-00.adoc[Variant_Union]() = default;
----

[.small]#xref:BloombergLP/bslstl/Variant_Union-0d/2constructor-00.adoc[_» more..._]#

Create a `Variant_Union` object holding an object of type `t_HEAD` direct‐initialized from the specified `args`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class... t_ARGS>
xref:BloombergLP/bslstl/Variant_Union-0d/2constructor-0c.adoc[Variant_Union](
    bsl::in_place_index_t<0>,
    t_ARGS&&... args);
----

[.small]#xref:BloombergLP/bslstl/Variant_Union-0d/2constructor-0c.adoc[_» more..._]#

Create a `Variant_Union` object holding the alternative at index (template parameter) `t_INDEX` in (template parameters) 't_HEAD, t_TAIL...`, direct‐initialized from the specified `args'. Note that `t_INDEX` is not necessarily the absolute index of the desired alternative in the `bsl::variant` object. We use the tag to "unravel" the union until we get to the desired alternative type.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    size_t t_INDEX,
    class... t_ARGS>
xref:BloombergLP/bslstl/Variant_Union-0d/2constructor-07.adoc[Variant_Union](
    bsl::in_place_index_t<t_INDEX>,
    t_ARGS&&... args);
----

[.small]#xref:BloombergLP/bslstl/Variant_Union-0d/2constructor-07.adoc[_» more..._]#


[.small]#Created with https://www.mrdocs.com[MrDocs]#