[#bsl-variant-2constructor-07fa]
= xref:bsl.adoc[bsl]::xref:bsl/variant.adoc[variant]::variant
:relfileprefix: ../../
:mrdocs:

Create a `variant` object holding the alternative with index (template parameter) `t_INDEX`, direct‐initialized from the specified `args`. If this `variant` is allocator‐aware, the specified `allocator` is used to supply memory. This constructor participates in overload resolution only if `t_INDEX` is a valid alternative index and the designated alternative is constructible from `args`.

== Synopsis

Declared in `<bslstl_variant.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    std::size_t t_INDEX,
    class... t_ARGS>
requires (t_INDEX < 1 + sizeof...(t_TAIL)) &&
                  std::is_constructible<BSLSTL_VARIANT_TYPE_AT_INDEX(t_INDEX),
                                        t_ARGS...>::value
explicit
variant(
    std::allocator_arg_t,
    xref:bsl/variant/allocator_type.adoc[allocator_type] allocator,
    bsl::in_place_index_t<t_INDEX>,
    t_ARGS&&... args);
----


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