[#BloombergLP-bslstl-Optional_OptNoSuchType]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::Optional_OptNoSuchType
:relfileprefix: ../../
:mrdocs:

Tag type distinguishing user arguments from `enable_if` defaults.

== Synopsis

Declared in `<bslstl_optional.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct Optional_OptNoSuchType;
----

== Description

This component‐private trivial tag type is used to distinguish between arguments passed by a user, and an `enable_if` argument. It is not default constructible so the following construction never invokes a constrained single parameter constructor: ` optional<SomeType> o(int, {}); `

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/Optional_OptNoSuchType/2constructor.adoc[`Optional_OptNoSuchType`]         [.small]#[constructor]#
| Create an `Optional_OptNoSuchType` object.
|===



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