[#BloombergLP-bslmf-Switch-07a1]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslmf.adoc[bslmf]::Switch
:relfileprefix: ../../
:mrdocs:

This meta‐function, parameterized by an integral `t_SWITCH_SELECTOR` and types `t_T0` up to `t_T9`, provides a single type alias, `Type`, which resolves, through specialization for a particular value `N` of `t_SWITCH_SELECTOR`, to the type `TN`, or to `Nil` if `t_SWITCH_SELECTOR` is negative or larger than the number of template arguments provided for the types.

== Synopsis

Declared in `<bslmf_switch.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    size_t t_SWITCH_SELECTOR,
    class... t_TYPES>
struct Switch;
----

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslmf/Switch-07a1/Type.adoc[`Type`] 
| This `Type` is an alias to the parameterized `TN`, where `N` is the integral value of the parameterized `t_SWITCH_SELECTOR`. Note that the first type in the list corresponds to `t_T0`, not `t_T1`.
|===


== Specializations

[cols="1"]
|===
| Name
| xref:BloombergLP/bslmf/Switch-04a.adoc[`Switch<0U, t_T0, t_TYPES...>`] 
| xref:BloombergLP/bslmf/Switch-058.adoc[`Switch<1U, t_T0, t_T1, t_TYPES...>`] 
| xref:BloombergLP/bslmf/Switch-051.adoc[`Switch<2U, t_T0, t_T1, t_T2, t_TYPES...>`] 
| xref:BloombergLP/bslmf/Switch-04e.adoc[`Switch<3U, t_T0, t_T1, t_T2, t_T3, t_TYPES...>`] 
| xref:BloombergLP/bslmf/Switch-0c.adoc[`Switch<4U, t_T0, t_T1, t_T2, t_T3, t_T4, t_TYPES...>`] 
| xref:BloombergLP/bslmf/Switch-0b.adoc[`Switch<5U, t_T0, t_T1, t_T2, t_T3, t_T4, t_T5, t_TYPES...>`] 
| xref:BloombergLP/bslmf/Switch-0a.adoc[`Switch<6U, t_T0, t_T1, t_T2, t_T3, t_T4, t_T5, t_T6, t_TYPES...>`] 
| xref:BloombergLP/bslmf/Switch-00.adoc[`Switch<7U, t_T0, t_T1, t_T2, t_T3, t_T4, t_T5, t_T6, t_T7, t_TYPES...>`] 
| xref:BloombergLP/bslmf/Switch-07c.adoc[`Switch<8U, t_T0, t_T1, t_T2, t_T3, t_T4, t_T5, t_T6, t_T7, t_T8, t_TYPES...>`] 
| xref:BloombergLP/bslmf/Switch-07a7.adoc[`Switch<9U, t_T0, t_T1, t_T2, t_T3, t_T4, t_T5, t_T6, t_T7, t_T8, t_T9, t_TYPES...>`] 
| xref:BloombergLP/bslmf/Switch-0d.adoc[`Switch<t_SWITCH_SELECTOR, t_T0, t_T1, t_T2, t_T3, t_T4, t_T5, t_T6, t_T7, t_T8, t_T9, t_T10, t_TYPES...>`] 
|===



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