[#bsl-variant_size-07]
= xref:bsl.adoc[bsl]::variant_size
:relfileprefix: ../
:mrdocs:

This metafunction calculates the number of alternatives in the (possibly cv‐qualified) `bsl::variant` type of (template parameter) `t_BSL_VARIANT`. The primary template is not defined.

== Synopsis

Declared in `<bslstl_variant.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_BSL_VARIANT>
struct variant_size;
----

== Specializations

[cols="1"]
|===
| Name
| xref:bsl/variant_size-05.adoc[`variant_size<t_BSL_VARIANT volatile>`] 
| xref:bsl/variant_size-02.adoc[`variant_size<t_BSL_VARIANT const>`] 
| xref:bsl/variant_size-0d.adoc[`variant_size<t_BSL_VARIANT const volatile>`] 
| xref:bsl/variant_size-09.adoc[`variant_size<variant<t_HEAD, t_TAIL...>>`] 
|===


== Derived Classes

[cols="1,4"]
|===
| Name| Description
| xref:bsl/variant_size-02.adoc[`variant_size<t_BSL_VARIANT const>`] 
| 
| xref:bsl/variant_size-05.adoc[`variant_size<t_BSL_VARIANT volatile>`] 
| 
| xref:bsl/variant_size-0d.adoc[`variant_size<t_BSL_VARIANT const volatile>`] 
| 
|===


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