[#BloombergLP-bslstl-Optional_OptNoSuchType]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::Optional&lowbar;OptNoSuchType
:relfileprefix: ../../
:mrdocs:

This component&hyphen;private trivial tag type is used to distinguish between arguments passed by a user, and an `enable&lowbar;if` argument&period; It is not default constructible so the following construction never invokes a constrained single parameter constructor&colon; &grave; optional&lt;SomeType&gt; o(int, &lcub;&rcub;)&semi; &grave;

== Synopsis

Declared in `&lt;bslstl&lowbar;optional&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct Optional&lowbar;OptNoSuchType;
----

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/Optional_OptNoSuchType/2constructor.adoc[`Optional&lowbar;OptNoSuchType`]         [.small]#[constructor]#
| Create an `Optional&lowbar;OptNoSuchType` object&period; Note that the argument is not used&period;
|===



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