[#bsl-variant_alternative-06]
= xref:bsl.adoc[bsl]::xref:bsl/variant_alternative-0c.adoc[variant_alternative]<t_INDEX, xref:bsl/variant.adoc[variant<t_HEAD, t_TAIL...>]>
:relfileprefix: ../
:mrdocs:

Compute the alternative type at index `t_INDEX` of a `bsl::variant`.

== Synopsis

Declared in `<bslstl_variant.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    std::size_t t_INDEX,
    class t_HEAD,
    class... t_TAIL>
struct xref:bsl/variant_alternative-0c.adoc[variant_alternative]<t_INDEX, xref:bsl/variant.adoc[variant<t_HEAD, t_TAIL...>]>
    : xref:bsl/Variant_VariantAlternativeImpl-06e.adoc[Variant_VariantAlternativeImpl<t_INDEX, t_HEAD, t_TAIL...>]
----

== Description

This partial specialization of `variant_alternative` computes the alternative type at index `t_INDEX` for a `bsl::variant` specialized on (template parameters) `t_HEAD, t_TAIL...`.

`t_INDEX` shall be a valid alternative index for the variant.

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:bsl/Variant_VariantAlternativeImpl-06e.adoc[Variant_VariantAlternativeImpl<t_INDEX, t_HEAD, t_TAIL...>]`
| This component‐private metafunction provides the implementation of `bsl::variant_alternative`.
|===


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