[#bsl-variant_alternative-0c]
= xref:bsl.adoc[bsl]::variant_alternative
:relfileprefix: ../
:mrdocs:

Compute the type of the alternative at index `t_INDEX`.

== Synopsis

Declared in `<bslstl_variant.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    std::size_t t_INDEX,
    class t_TYPE>
struct variant_alternative;
----

== Description

This metafunction calculates the type of the alternative whose index is (template parameter) `t_INDEX` in the possibly cv‐qualified `bsl::variant` type of (template parameter) `t_TYPE`.

If `t_TYPE` is cv‐qualified, its cv‐qualifiers are applied to the alternative.

== Specializations

[cols="1,4"]
|===
| Name| Description
| xref:bsl/variant_alternative-09.adoc[`variant_alternative<t_INDEX, t_TYPE volatile>`] 
| Strip `volatile` from `t_TYPE` before computing the alternative type.
| xref:bsl/variant_alternative-0d.adoc[`variant_alternative<t_INDEX, t_TYPE const>`] 
| Strip `const` from `t_TYPE` before computing the alternative type.
| xref:bsl/variant_alternative-0f.adoc[`variant_alternative<t_INDEX, t_TYPE const volatile>`] 
| Strip `const volatile` from `t_TYPE` before computing the alternative type.
| xref:bsl/variant_alternative-06.adoc[`variant_alternative<t_INDEX, variant<t_HEAD, t_TAIL...>>`] 
| Compute the alternative type at index `t_INDEX` of a `bsl::variant`.
|===



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