[#BloombergLP-bslmf-SelectTrait]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslmf.adoc[bslmf]::SelectTrait
:relfileprefix: ../../
:mrdocs:

Instantiate each specified (template parameter) `t_TRAIT1` to `t_TRAIT9` metafunction using the specified (template parameter) `t_TYPE`. Inherit from `SelectTraitCase<TRAITx>`, where _x_ is `1` if `t_TRAIT1<t_TYPE>::value` is true, `2` if `t_TRAIT2<t_TYPE>::value` is true, etc.. If none of the traits evaluates to true, then inherit from `SelectTraitCase<>`, which means that none of the traits match.

== Synopsis

Declared in `<bslmf_selecttrait.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class t_TYPE,
    template<class> typename t_TRAIT1,
    template<class> typename t_TRAIT2 = SelectTrait_False,
    template<class> typename t_TRAIT3 = SelectTrait_False,
    template<class> typename t_TRAIT4 = SelectTrait_False,
    template<class> typename t_TRAIT5 = SelectTrait_False,
    template<class> typename t_TRAIT6 = SelectTrait_False,
    template<class> typename t_TRAIT7 = SelectTrait_False,
    template<class> typename t_TRAIT8 = SelectTrait_False,
    template<class> typename t_TRAIT9 = SelectTrait_False>
struct SelectTrait
    : /* implementation-defined */::Type
----

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `/* implementation-defined */::Type`
| 
|===

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslmf/SelectTrait/OrdinalType.adoc[`OrdinalType`] 
| `OrdinalType` is an integral constant holding the selected trait ordinal.
|===


== Enums

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslmf/SelectTrait/_04enum.adoc[`Unnamed enum`] 
| Index of the selected trait ordinal.
|===



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