[#BloombergLP-bslstl-Variant_Base-2constructor-04]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/Variant_Base.adoc[Variant_Base]::Variant_Base
:relfileprefix: ../../../
:mrdocs:

Create a `Variant_Base` object holding the alternative with index (template parameter) `t_INDEX`, direct‐initialized from the specified `args`.

== Synopsis

Declared in `<bslstl_variant.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    size_t t_INDEX,
    class... t_ARGS>
explicit
Variant_Base(
    std::allocator_arg_t allocatorArg,
    xref:BloombergLP/bslstl/Variant_Base/allocator_type.adoc[allocator_type] allocator,
    bsl::in_place_index_t<t_INDEX> inPlaceIndex,
    t_ARGS&&... args);
----

== Description

Create a `Variant_Base` object holding the alternative with index (template parameter) `t_INDEX`, direct‐initialized from the specified `args`. If this `Variant_Base` is allocator‐aware, the specified `allocator` is used to supply memory.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *allocatorArg*
| tag selecting the allocator‐extended overload
| *allocator*
| allocator used to supply memory
| *inPlaceIndex*
| tag selecting the in‐place‐index constructor
| *args*
| arguments forwarded to the alternative's constructor
|===


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