[#BloombergLP-bslstl-Variant_CountType-0d]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::Variant_CountType
:relfileprefix: ../../
:mrdocs:

This component‐private metafunction calculates the number of times (template parameter) `t_TYPE` occurs in (template parameters) `t_HEAD, t_TAIL...`. An alternative must have the same cv‐qualification as `t_TYPE` in order to be counted.

== Synopsis

Declared in `<bslstl_variant.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class t_TYPE,
    class t_HEAD = BSLSTL_VARIANT_NOT_A_TYPE,
    class... t_TAIL>
struct Variant_CountType
    : xref:bsl/integral_constant-02.adoc[bsl::integral_constant<size_t, bsl::is_same<t_TYPE, t_HEAD>::value + Variant_CountType<t_TYPE, t_TAIL...>::value>]
----

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:bsl/integral_constant-02.adoc[bsl::integral_constant<size_t, bsl::is_same<t_TYPE, t_HEAD>::value + Variant_CountType<t_TYPE, t_TAIL...>::value>]`
| Metafunction representing a compile‐time constant of the specified (template parameter) `t_TYPE` with the specified (template parameter) `t_VALUE`.
|===

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:bsl/integral_constant-02/type.adoc[`type`] 
| Alias for this `integral_constant` specialization.
| xref:bsl/integral_constant-02/value_type.adoc[`value_type`] 
| 
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:bsl/integral_constant-02/operator_call.adoc[`operator()`] 
| Return a copy of the template argument `t_VALUE`.
| xref:bsl/integral_constant-02/2conversion.adoc[`operator value_type`] 
| 
|===


== Static Data Members

[cols="1"]
|===
| Name
| xref:bsl/integral_constant-02/value.adoc[`value`] 
|===


== Specializations

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/Variant_CountType-0c.adoc[`Variant_CountType<t_TYPE, BSLSTL_VARIANT_NOT_A_TYPE>`] 
| Specialization for purposes of the sim_cpp11_features.pl script.
|===



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