[#BloombergLP-bdlat_HasFallbackEnumerator]
= xref:BloombergLP.adoc[BloombergLP]::bdlat&lowbar;HasFallbackEnumerator
:relfileprefix: ../
:mrdocs:

This trait may be declared for &quot;enumeration&quot; types that have a fallback enumerator value&period;

== Synopsis

Declared in `&lt;bdlat&lowbar;typetraits&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;class TYPE&gt;
struct bdlat&lowbar;HasFallbackEnumerator
    : bslmf::DetectNestedTrait&lt;TYPE, bdlat&lowbar;HasFallbackEnumerator&gt;::type
----

== Description

If this trait is declared to be `true` for the specified `TYPE` but the trait `bdlat&lowbar;IsBasicEnumeration` has not previously been declared to be `true` for `TYPE`, the behavior is undefined&period;

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `bslmf::DetectNestedTrait&lt;TYPE, bdlat&lowbar;HasFallbackEnumerator&gt;::type`
| 
|===


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