[#BloombergLP-bslstl-Variant_Base-2constructor-0b4]
= 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 whose index is the specified `index` without constructing an alternative object. If this `Variant_Base` is allocator‐aware, the specified `allocator` is used to supply memory.

== Synopsis

Declared in `<bslstl_variant.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
Variant_Base(
    std::allocator_arg_t,
    xref:BloombergLP/bslstl/Variant_Base/allocator_type.adoc[allocator_type] allocator,
    xref:BloombergLP/bslstl/Variant_ConstructFromStdTag.adoc[Variant_ConstructFromStdTag],
    size_t index);
----


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