[#BloombergLP-bslstl-Variant_TypeToIndexImpl-07]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/Variant_TypeToIndexImpl-0a.adoc[Variant_TypeToIndexImpl]<t_INDEX, t_TYPE, BSLSTL_VARIANT_NOT_A_TYPE>
:relfileprefix: ../../
:mrdocs:

This partial specialization is used when the list of alternatives `t_HEAD, t_TAIL...` is empty, i.e., `t_TYPE` wasn't found in the originally supplied list of alternatives.

== Synopsis

Declared in `<bslstl_variant.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    size_t t_INDEX,
    class t_TYPE>
struct xref:BloombergLP/bslstl/Variant_TypeToIndexImpl-0a.adoc[Variant_TypeToIndexImpl]<t_INDEX, t_TYPE, BSLSTL_VARIANT_NOT_A_TYPE>
    : xref:bsl/integral_constant-02.adoc[bsl::integral_constant<size_t, bsl::variant_npos>]
----

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:bsl/integral_constant-02.adoc[bsl::integral_constant<size_t, bsl::variant_npos>]`
| 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:BloombergLP/bslstl/Variant_TypeToIndexImpl-07/type.adoc[`type`] 
| Alias for this `integral_constant` specialization.
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/Variant_TypeToIndexImpl-07/operator_call.adoc[`operator()`] 
| Return a copy of the template argument `t_VALUE`.
|===



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